======================================
| [ 1178.755180][   T11] ==================================================================
| [ 1178.755657][ T11] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:729) 
| [ 1178.756051][   T11] Read of size 1 at addr ffff888002f2007c by task kworker/u8:0/11
| [ 1178.756464][   T11]
[ 1178.757023][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1178.757647][   T11] Workqueue: netns cleanup_net
[ 1178.757901][   T11] Call Trace:
[ 1178.758073][   T11]  <TASK>
[ 1178.758225][ T11] dump_stack_lvl (lib/dump_stack.c:107) 
[ 1178.758469][ T11] print_address_description.constprop.0 (mm/kasan/report.c:378) 
[ 1178.758812][ T11] ? kobject_put (lib/kobject.c:729) 
[ 1178.759045][ T11] print_report (mm/kasan/report.c:489) 
[ 1178.759275][ T11] ? kasan_addr_to_slab (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/page-flags.h:481 mm/kasan/../slab.h:206 mm/kasan/common.c:38) 
[ 1178.759539][ T11] kasan_report (mm/kasan/report.c:603) 
[ 1178.759765][ T11] ? kobject_put (lib/kobject.c:729) 
[ 1178.760021][ T11] kobject_put (lib/kobject.c:729) 
[ 1178.760250][ T11] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) 
[ 1178.760490][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1178.760736][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1178.761019][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1178.761253][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1178.761575][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1178.761836][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1178.762096][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1178.762363][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1178.762617][ T11] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 1178.762856][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1178.763136][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1178.763376][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1178.763618][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1178.763878][ T11] kthread (kernel/kthread.c:388) 
[ 1178.764108][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1178.764350][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1178.764589][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1178.764839][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1178.783566][   T11] ------------[ cut here ]------------
| [ 1178.783880][   T11] refcount_t: underflow; use-after-free.
| [ 1178.784275][ T11] WARNING: CPU: 0 PID: 11 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
| [ 1178.784819][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1178.786399][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1178.787118][   T11] Workqueue: netns cleanup_net
[ 1178.787412][ T11] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 1178.787766][ T11] Code: f9 82 03 80 fb 01 0f 87 ee 02 b1 01 83 e3 01 0f 85 4d ff ff ff c6 05 9a f9 82 03 01 90 48 c7 c7 20 7a a2 ae e8 3e 05 2a ff 90 <0f> 0b 90 90 e9 2f ff ff ff 48 89 df e8 8c 68 a6 ff e9 b6 fe ff ff
All code
========
   0:	f9                   	stc
   1:	82                   	(bad)
   2:	03 80 fb 01 0f 87    	add    -0x78f0fe05(%rax),%eax
   8:	ee                   	out    %al,(%dx)
   9:	02 b1 01 83 e3 01    	add    0x1e38301(%rcx),%dh
   f:	0f 85 4d ff ff ff    	jne    0xffffffffffffff62
  15:	c6 05 9a f9 82 03 01 	movb   $0x1,0x382f99a(%rip)        # 0x382f9b6
  1c:	90                   	nop
  1d:	48 c7 c7 20 7a a2 ae 	mov    $0xffffffffaea27a20,%rdi
  24:	e8 3e 05 2a ff       	call   0xffffffffff2a0567
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	e9 2f ff ff ff       	jmp    0xffffffffffffff62
  33:	48 89 df             	mov    %rbx,%rdi
  36:	e8 8c 68 a6 ff       	call   0xffffffffffa668c7
  3b:	e9 b6 fe ff ff       	jmp    0xfffffffffffffef6

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	e9 2f ff ff ff       	jmp    0xffffffffffffff38
   9:	48 89 df             	mov    %rbx,%rdi
   c:	e8 8c 68 a6 ff       	call   0xffffffffffa6689d
  11:	e9 b6 fe ff ff       	jmp    0xfffffffffffffecc
[ 1178.788833][   T11] RSP: 0018:ffffc900000bfb98 EFLAGS: 00010282
[ 1178.789195][   T11] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffabd1056f
[ 1178.789653][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1178.790161][   T11] RBP: 0000000000000003 R08: 0000000000000000 R09: fffff52000017f18
[ 1178.790620][   T11] R10: ffffc900000bf8c7 R11: 205d313154202020 R12: ffff888009052000
[ 1178.791083][   T11] R13: ffff888009052df8 R14: ffffc900000bfc98 R15: ffff888009052bc0
[ 1178.791548][   T11] FS:  0000000000000000(0000) GS:ffff888035200000(0000) knlGS:0000000000000000
[ 1178.792061][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1178.792479][   T11] CR2: 00007fff55f2ac98 CR3: 0000000006816003 CR4: 00000000001706f0
[ 1178.792929][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1178.793357][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1178.793820][   T11] Call Trace:
[ 1178.794010][   T11]  <TASK>
[ 1178.794167][ T11] ? __warn (kernel/panic.c:677) 
[ 1178.794422][ T11] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 1178.794763][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1178.795019][ T11] ? vprintk_emit (kernel/printk/printk.c:2313) 
[ 1178.795312][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1178.795552][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1178.795829][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1178.796123][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1178.796379][ T11] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 1178.796715][ T11] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 1178.797044][ T11] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) 
[ 1178.797315][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1178.797564][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1178.797880][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1178.798158][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1178.798492][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1178.798805][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1178.799068][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1178.799344][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1178.799612][ T11] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 1178.799892][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1178.800229][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1178.800508][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1178.800798][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1178.801083][ T11] kthread (kernel/kthread.c:388) 
[ 1178.801299][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1178.801549][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1178.801786][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1178.802042][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1178.805081][   T11] ------------[ cut here ]------------
| [ 1178.805414][   T11] sysfs group 'bridge' not found for kobject 'br1'
| [ 1178.805849][ T11] WARNING: CPU: 1 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1178.806592][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1178.808281][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1178.808924][   T11] Workqueue: netns cleanup_net
[ 1178.809194][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1178.809501][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1178.810684][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1178.811079][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1178.811505][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1178.812012][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1178.812464][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff888009052628
[ 1178.812947][   T11] R13: ffff888009052df8 R14: ffffc900000bfc98 R15: ffff888009052bc0
[ 1178.813453][   T11] FS:  0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000
[ 1178.813979][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1178.814395][   T11] CR2: 00007f3fad441000 CR3: 0000000030134006 CR4: 00000000001706f0
[ 1178.814855][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1178.815332][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1178.815749][   T11] Call Trace:
[ 1178.815926][   T11]  <TASK>
[ 1178.816092][ T11] ? __warn (kernel/panic.c:677) 
[ 1178.816313][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1178.816570][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1178.816850][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1178.817107][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1178.817341][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1178.817596][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1178.817872][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1178.818158][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1178.818484][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1178.818766][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1178.819099][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1178.819370][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1178.819726][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1178.820055][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1178.820335][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1178.820643][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1178.820971][ T11] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 1178.821253][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1178.821572][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1178.821851][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1178.822155][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1178.822466][ T11] kthread (kernel/kthread.c:388) 
[ 1178.822740][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1178.823011][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1178.823278][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1178.823552][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1178.827046][   T11] ------------[ cut here ]------------
| [ 1178.827354][   T11] sysfs group 'bridge' not found for kobject 'br2'
| [ 1178.827718][ T11] WARNING: CPU: 1 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1178.828201][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1178.829840][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1178.830581][   T11] Workqueue: netns cleanup_net
[ 1178.830868][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1178.831250][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1178.832422][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1178.832815][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1178.833240][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1178.833675][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1178.834160][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800a29a628
[ 1178.834650][   T11] R13: ffff88800a29adf8 R14: ffffc900000bfc98 R15: ffff88800a29abc0
[ 1178.835168][   T11] FS:  0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000
[ 1178.835695][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1178.836053][   T11] CR2: 00007f3fad441000 CR3: 0000000030134006 CR4: 00000000001706f0
[ 1178.836533][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1178.837020][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1178.837495][   T11] Call Trace:
[ 1178.837685][   T11]  <TASK>
[ 1178.837858][ T11] ? __warn (kernel/panic.c:677) 
[ 1178.838104][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1178.838400][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1178.838673][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1178.838948][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1178.839316][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1178.839579][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1178.839895][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1178.840193][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1178.840502][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1178.840783][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1178.841075][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1178.841311][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1178.841611][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1178.841874][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1178.842134][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1178.842409][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1178.842672][ T11] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 1178.842917][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1178.843247][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1178.843522][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1178.843816][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1178.844223][ T11] kthread (kernel/kthread.c:388) 
[ 1178.844479][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1178.844795][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1178.845070][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1178.845338][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1179.073404][   T11] ------------[ cut here ]------------
| [ 1179.073707][   T11] sysfs group 'bridge' not found for kobject 'br1'
| [ 1179.074088][ T11] WARNING: CPU: 1 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1179.074567][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1179.076270][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1179.076907][   T11] Workqueue: netns cleanup_net
[ 1179.077174][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1179.077484][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1179.078503][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1179.078825][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1179.079250][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1179.079661][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1179.080096][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff888006e7a628
[ 1179.080512][   T11] R13: ffff888006e7adf8 R14: ffffc900000bfc98 R15: ffff888006e7abc0
[ 1179.080961][   T11] FS:  0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000
[ 1179.081523][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1179.081873][   T11] CR2: 00007fc6e9ee14f0 CR3: 0000000030134006 CR4: 00000000001706f0
[ 1179.082299][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1179.082710][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1179.083128][   T11] Call Trace:
[ 1179.083305][   T11]  <TASK>
[ 1179.083462][ T11] ? __warn (kernel/panic.c:677) 
[ 1179.083682][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1179.083942][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1179.084304][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1179.084596][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1179.084825][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1179.085129][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1179.085419][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1179.085692][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1179.086042][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1179.086303][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1179.086673][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1179.086926][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1179.087229][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1179.087480][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1179.087753][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1179.088026][ T11] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 1179.088271][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1179.088560][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1179.088808][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1179.089065][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1179.089405][ T11] kthread (kernel/kthread.c:388) 
[ 1179.089680][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1179.089946][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1179.090263][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1179.090512][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1179.093915][   T11] ------------[ cut here ]------------
| [ 1179.094274][   T11] sysfs group 'bridge' not found for kobject 'br2'
| [ 1179.094652][ T11] WARNING: CPU: 1 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1179.095203][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1179.096696][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1179.097416][   T11] Workqueue: netns cleanup_net
[ 1179.097725][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1179.098091][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1179.099267][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1179.099619][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1179.100115][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1179.100596][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1179.101080][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800b39a628
[ 1179.101577][   T11] R13: ffff88800b39adf8 R14: ffffc900000bfc98 R15: ffff88800b39abc0
[ 1179.102034][   T11] FS:  0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000
[ 1179.102592][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1179.102985][   T11] CR2: 00007fc6e9ee14f0 CR3: 0000000030134006 CR4: 00000000001706f0
[ 1179.103468][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1179.103947][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1179.104414][   T11] Call Trace:
[ 1179.104617][   T11]  <TASK>
[ 1179.104808][ T11] ? __warn (kernel/panic.c:677) 
[ 1179.105061][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1179.105347][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1179.105682][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1179.105931][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1179.106169][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1179.106417][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1179.106682][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1179.106917][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1179.107202][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1179.107450][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1179.107729][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1179.107966][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1179.108299][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1179.108580][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1179.108888][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1179.109192][ T11] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 1179.109467][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1179.109803][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1179.110105][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1179.110385][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1179.110752][ T11] kthread (kernel/kthread.c:388) 
[ 1179.110989][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1179.111266][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1179.111539][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1179.111781][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1195.517417][   T11] ------------[ cut here ]------------
| [ 1195.517769][   T11] sysfs group 'bridge' not found for kobject 'br1'
| [ 1195.518200][ T11] WARNING: CPU: 0 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1195.518721][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1195.520291][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1195.521015][   T11] Workqueue: netns cleanup_net
[ 1195.521320][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.521655][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1195.522716][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1195.523065][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1195.523534][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1195.524015][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1195.524472][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff888007be2628
[ 1195.524908][   T11] R13: ffff888007be2df8 R14: ffffc900000bfc98 R15: ffff888007be2bc0
[ 1195.525381][   T11] FS:  0000000000000000(0000) GS:ffff888035200000(0000) knlGS:0000000000000000
[ 1195.525917][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1195.526306][   T11] CR2: 00007fff55f2a638 CR3: 0000000006816006 CR4: 00000000001706f0
[ 1195.526746][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1195.527215][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1195.527689][   T11] Call Trace:
[ 1195.527906][   T11]  <TASK>
[ 1195.528094][ T11] ? __warn (kernel/panic.c:677) 
[ 1195.528353][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1195.528656][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.528969][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1195.529244][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1195.529516][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1195.529811][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1195.530127][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1195.530388][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.530668][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1195.530918][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1195.531207][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1195.531445][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1195.531693][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1195.531954][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1195.532245][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1195.532571][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1195.532863][ T11] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 1195.533146][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1195.533473][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1195.533750][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1195.534043][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1195.534371][ T11] kthread (kernel/kthread.c:388) 
[ 1195.534621][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1195.534897][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1195.535177][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1195.535457][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1195.538680][   T11] ------------[ cut here ]------------
| [ 1195.539017][   T11] sysfs group 'bridge' not found for kobject 'br2'
| [ 1195.539403][ T11] WARNING: CPU: 0 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1195.539920][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1195.541520][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1195.542193][   T11] Workqueue: netns cleanup_net
[ 1195.542485][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.542846][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1195.543905][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1195.544254][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1195.544710][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1195.545179][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1195.545627][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff888009c6a628
[ 1195.546076][   T11] R13: ffff888009c6adf8 R14: ffffc900000bfc98 R15: ffff888009c6abc0
[ 1195.546532][   T11] FS:  0000000000000000(0000) GS:ffff888035200000(0000) knlGS:0000000000000000
[ 1195.547057][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1195.547441][   T11] CR2: 00007fff55f2a638 CR3: 0000000006816006 CR4: 00000000001706f0
[ 1195.547879][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1195.548336][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1195.548810][   T11] Call Trace:
[ 1195.549036][   T11]  <TASK>
[ 1195.549216][ T11] ? __warn (kernel/panic.c:677) 
[ 1195.549477][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1195.549783][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.550110][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1195.550378][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1195.550645][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1195.550942][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1195.551221][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1195.551465][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.551740][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1195.551988][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1195.552279][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1195.552515][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1195.552767][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1195.553041][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1195.553290][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1195.553559][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1195.553824][ T11] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 1195.554079][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1195.554364][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1195.554606][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1195.554859][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1195.555138][ T11] kthread (kernel/kthread.c:388) 
[ 1195.555356][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1195.555605][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1195.555839][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1195.556091][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1195.792350][   T11] ------------[ cut here ]------------
| [ 1195.792674][   T11] sysfs group 'bridge' not found for kobject 'br1'
| [ 1195.793108][ T11] WARNING: CPU: 2 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1195.793655][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1195.795163][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1195.795797][   T11] Workqueue: netns cleanup_net
[ 1195.796058][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.796393][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1195.797477][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1195.797828][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1195.798293][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1195.798772][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1195.799240][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800b36a628
[ 1195.799700][   T11] R13: ffff88800b36adf8 R14: ffffc900000bfc98 R15: ffff88800b36abc0
[ 1195.800137][   T11] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[ 1195.800625][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1195.801011][   T11] CR2: 00007fc6ea01d7f0 CR3: 0000000030134005 CR4: 00000000001706f0
[ 1195.801475][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1195.801958][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1195.802421][   T11] Call Trace:
[ 1195.802598][   T11]  <TASK>
[ 1195.802783][ T11] ? __warn (kernel/panic.c:677) 
[ 1195.803037][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1195.803326][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.803635][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1195.803917][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1195.804167][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1195.804458][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1195.804729][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1195.804965][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.805246][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1195.805496][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1195.805779][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1195.806069][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1195.806332][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1195.806579][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1195.806873][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1195.807175][ T11] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 1195.807437][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1195.807741][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1195.808015][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1195.808287][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1195.808555][ T11] kthread (kernel/kthread.c:388) 
[ 1195.808774][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1195.809019][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1195.809261][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1195.809506][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1195.812642][   T11] ------------[ cut here ]------------
| [ 1195.812966][   T11] sysfs group 'bridge' not found for kobject 'br2'
| [ 1195.813433][ T11] WARNING: CPU: 2 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1195.813958][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1195.815539][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1195.816232][   T11] Workqueue: netns cleanup_net
[ 1195.816517][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.816871][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1195.817978][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1195.818301][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1195.818720][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1195.819146][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1195.819563][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800ba12628
[ 1195.819983][   T11] R13: ffff88800ba12df8 R14: ffffc900000bfc98 R15: ffff88800ba12bc0
[ 1195.820405][   T11] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[ 1195.820965][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1195.821340][   T11] CR2: 00007fc6ea01d7f0 CR3: 0000000030134005 CR4: 00000000001706f0
[ 1195.821795][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1195.822258][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1195.822718][   T11] Call Trace:
[ 1195.822944][   T11]  <TASK>
[ 1195.823108][ T11] ? __warn (kernel/panic.c:677) 
[ 1195.823354][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1195.823611][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.823889][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1195.824140][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1195.824368][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1195.824619][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1195.824891][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1195.825134][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1195.825408][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1195.825653][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1195.825999][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1195.826291][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1195.826574][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1195.826865][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1195.827142][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1195.827428][ T11] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 1195.827699][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1195.828015][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1195.828289][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1195.828565][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1195.828855][ T11] kthread (kernel/kthread.c:388) 
[ 1195.829099][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1195.829389][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1195.829632][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1195.829887][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1212.116164][   T11] ------------[ cut here ]------------
| [ 1212.116492][   T11] sysfs group 'bridge' not found for kobject 'br1'
| [ 1212.116909][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1212.117446][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1212.119131][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1212.119789][   T11] Workqueue: netns cleanup_net
[ 1212.120084][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.120429][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1212.121556][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1212.121885][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1212.122311][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1212.122729][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1212.123221][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800ae3a628
[ 1212.123644][   T11] R13: ffff88800ae3adf8 R14: ffffc900000bfc98 R15: ffff88800ae3abc0
[ 1212.124124][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[ 1212.124655][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1212.125068][   T11] CR2: 00007fc6ea01d7f0 CR3: 0000000030134006 CR4: 00000000001706f0
[ 1212.125526][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1212.125971][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1212.126462][   T11] Call Trace:
[ 1212.126647][   T11]  <TASK>
[ 1212.126820][ T11] ? __warn (kernel/panic.c:677) 
[ 1212.127070][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1212.127355][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.127670][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1212.127918][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1212.128157][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1212.128425][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1212.128746][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1212.129013][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.129328][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1212.129606][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1212.129909][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1212.130196][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1212.130463][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1212.130730][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1212.130999][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1212.131322][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1212.131596][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1212.131914][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1212.132192][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1212.132456][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1212.132753][ T11] kthread (kernel/kthread.c:388) 
[ 1212.132973][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1212.133248][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1212.133518][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1212.133787][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1212.136877][   T11] ------------[ cut here ]------------
| [ 1212.137173][   T11] sysfs group 'bridge' not found for kobject 'br2'
| [ 1212.137545][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1212.138030][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1212.139612][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1212.140405][   T11] Workqueue: netns cleanup_net
[ 1212.140682][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.141017][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1212.142096][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1212.142438][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1212.142889][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1212.143333][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1212.143797][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800759a628
[ 1212.144239][   T11] R13: ffff88800759adf8 R14: ffffc900000bfc98 R15: ffff88800759abc0
[ 1212.144681][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[ 1212.145193][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1212.145561][   T11] CR2: 00007fc6ea01d7f0 CR3: 0000000030134006 CR4: 00000000001706f0
[ 1212.145980][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1212.146403][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1212.146825][   T11] Call Trace:
[ 1212.147013][   T11]  <TASK>
[ 1212.147174][ T11] ? __warn (kernel/panic.c:677) 
[ 1212.147396][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1212.147650][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.147929][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1212.148211][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1212.148444][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1212.148693][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1212.148961][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1212.149204][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.149487][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1212.149744][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1212.150123][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1212.150365][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1212.150664][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1212.150957][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1212.151312][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1212.151624][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1212.151918][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1212.152211][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1212.152458][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1212.152716][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1212.152990][ T11] kthread (kernel/kthread.c:388) 
[ 1212.153218][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1212.153467][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1212.153703][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1212.153952][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1212.391371][   T11] ------------[ cut here ]------------
| [ 1212.391704][   T11] sysfs group 'bridge' not found for kobject 'br1'
| [ 1212.392149][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1212.392679][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1212.394205][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1212.394864][   T11] Workqueue: netns cleanup_net
[ 1212.395156][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.395473][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1212.396499][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1212.396824][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1212.397250][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1212.397667][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1212.398091][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff888008052628
[ 1212.398509][   T11] R13: ffff888008052df8 R14: ffffc900000bfc98 R15: ffff888008052bc0
[ 1212.398927][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[ 1212.399404][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1212.399759][   T11] CR2: 00007f745e4de270 CR3: 0000000030134001 CR4: 00000000001706f0
[ 1212.400183][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1212.400598][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1212.401019][   T11] Call Trace:
[ 1212.401198][   T11]  <TASK>
[ 1212.401354][ T11] ? __warn (kernel/panic.c:677) 
[ 1212.401576][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1212.401836][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.402120][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1212.402368][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1212.402602][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1212.402854][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1212.403132][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1212.403374][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.403656][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1212.403910][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1212.404197][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1212.404441][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1212.404705][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1212.404959][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1212.405246][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1212.405514][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1212.405807][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1212.406062][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1212.406316][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1212.406587][ T11] kthread (kernel/kthread.c:388) 
[ 1212.406807][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1212.407057][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1212.407300][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1212.407546][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1212.410529][   T11] ------------[ cut here ]------------
| [ 1212.410837][   T11] sysfs group 'bridge' not found for kobject 'br2'
| [ 1212.411222][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1212.411713][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1212.413285][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1212.413933][   T11] Workqueue: netns cleanup_net
[ 1212.414197][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.414508][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1212.415544][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1212.415869][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1212.416297][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1212.416770][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1212.417226][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800956a628
[ 1212.417687][   T11] R13: ffff88800956adf8 R14: ffffc900000bfc98 R15: ffff88800956abc0
[ 1212.418164][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[ 1212.418631][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1212.418981][   T11] CR2: 00007f745e4de270 CR3: 0000000030134001 CR4: 00000000001706f0
[ 1212.419411][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1212.419839][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1212.420265][   T11] Call Trace:
[ 1212.420443][   T11]  <TASK>
[ 1212.420600][ T11] ? __warn (kernel/panic.c:677) 
[ 1212.420818][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1212.421083][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.421425][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1212.421677][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1212.421923][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1212.422230][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1212.422514][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1212.422792][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1212.423124][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1212.423389][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1212.423722][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1212.423974][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1212.424309][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1212.424570][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1212.424843][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1212.425119][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1212.425405][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1212.425648][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1212.425903][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1212.426185][ T11] kthread (kernel/kthread.c:388) 
[ 1212.426402][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1212.426652][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1212.426888][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1212.427139][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1228.708064][   T11] ------------[ cut here ]------------
| [ 1228.708364][   T11] sysfs group 'bridge' not found for kobject 'br1'
| [ 1228.708743][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1228.709239][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1228.710760][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1228.711410][   T11] Workqueue: netns cleanup_net
[ 1228.711669][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1228.711987][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1228.713157][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1228.713524][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1228.713954][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1228.714434][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1228.714881][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800a0c2628
[ 1228.715361][   T11] R13: ffff88800a0c2df8 R14: ffffc900000bfc98 R15: ffff88800a0c2bc0
[ 1228.715815][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[ 1228.716323][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1228.716716][   T11] CR2: 00007fc6e9ee14f0 CR3: 0000000030134001 CR4: 00000000001706f0
[ 1228.717188][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1228.717645][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1228.718111][   T11] Call Trace:
[ 1228.718297][   T11]  <TASK>
[ 1228.718468][ T11] ? __warn (kernel/panic.c:677) 
[ 1228.718730][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1228.718995][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1228.719313][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1228.719577][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1228.719817][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1228.720073][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1228.720346][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1228.720584][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1228.720859][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1228.721112][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1228.721442][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1228.721714][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1228.722010][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1228.722279][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1228.722567][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1228.722870][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1228.723159][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1228.723468][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1228.723739][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1228.724013][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1228.724342][ T11] kthread (kernel/kthread.c:388) 
[ 1228.724578][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1228.724853][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1228.725098][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1228.725344][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1228.728517][   T11] ------------[ cut here ]------------
| [ 1228.728815][   T11] sysfs group 'bridge' not found for kobject 'br2'
| [ 1228.729239][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1228.729777][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1228.731484][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1228.732199][   T11] Workqueue: netns cleanup_net
[ 1228.732482][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1228.732792][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1228.733820][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1228.734220][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1228.734691][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1228.735168][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1228.735638][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800b8ea628
[ 1228.736092][   T11] R13: ffff88800b8eadf8 R14: ffffc900000bfc98 R15: ffff88800b8eabc0
[ 1228.736558][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[ 1228.737063][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1228.737417][   T11] CR2: 00007fc6e9ee14f0 CR3: 0000000030134001 CR4: 00000000001706f0
[ 1228.737874][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1228.738322][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1228.738800][   T11] Call Trace:
[ 1228.738991][   T11]  <TASK>
[ 1228.739156][ T11] ? __warn (kernel/panic.c:677) 
[ 1228.739393][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1228.739674][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1228.739955][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1228.740226][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1228.740482][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1228.740755][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1228.741051][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1228.741345][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1228.741631][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1228.741920][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1228.742207][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1228.742445][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1228.742697][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1228.742959][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1228.743215][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1228.743502][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1228.743776][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1228.744071][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1228.744318][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1228.744594][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1228.744876][ T11] kthread (kernel/kthread.c:388) 
[ 1228.745113][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1228.745380][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1228.745619][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1228.745871][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1228.977452][   T11] ------------[ cut here ]------------
| [ 1228.977792][   T11] sysfs group 'bridge' not found for kobject 'br1'
| [ 1228.978174][ T11] WARNING: CPU: 2 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1228.978652][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1228.980232][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1228.980923][   T11] Workqueue: netns cleanup_net
[ 1228.981209][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1228.981536][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1228.982695][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1228.983041][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1228.983505][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1228.983957][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1228.984426][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800a82a628
[ 1228.984912][   T11] R13: ffff88800a82adf8 R14: ffffc900000bfc98 R15: ffff88800a82abc0
[ 1228.985336][   T11] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[ 1228.985816][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1228.986204][   T11] CR2: 0000557898db2dec CR3: 0000000006816002 CR4: 00000000001706f0
[ 1228.986620][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1228.987055][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1228.987520][   T11] Call Trace:
[ 1228.987720][   T11]  <TASK>
[ 1228.987900][ T11] ? __warn (kernel/panic.c:677) 
[ 1228.988162][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1228.988434][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1228.988737][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1228.988977][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1228.989214][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1228.989491][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1228.989798][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1228.990045][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1228.990321][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1228.990568][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1228.990850][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1228.991091][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1228.991354][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1228.991601][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1228.991873][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1228.992143][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1228.992427][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1228.992674][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1228.992929][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1228.993205][ T11] kthread (kernel/kthread.c:388) 
[ 1228.993422][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1228.993668][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1228.993909][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1228.994188][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1228.997387][   T11] ------------[ cut here ]------------
| [ 1228.997699][   T11] sysfs group 'bridge' not found for kobject 'br2'
| [ 1228.998068][ T11] WARNING: CPU: 2 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1228.998610][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1229.000247][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1229.000900][   T11] Workqueue: netns cleanup_net
[ 1229.001189][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1229.001564][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1229.002691][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1229.003041][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1229.003461][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1229.003931][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1229.004373][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800c282628
[ 1229.004842][   T11] R13: ffff88800c282df8 R14: ffffc900000bfc98 R15: ffff88800c282bc0
[ 1229.005310][   T11] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[ 1229.005784][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1229.006136][   T11] CR2: 0000557898db2dec CR3: 0000000006816002 CR4: 00000000001706f0
[ 1229.006557][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1229.007013][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1229.007428][   T11] Call Trace:
[ 1229.007604][   T11]  <TASK>
[ 1229.007759][ T11] ? __warn (kernel/panic.c:677) 
[ 1229.007973][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1229.008234][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1229.008508][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1229.008749][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1229.008977][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1229.009229][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1229.009534][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1229.009779][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1229.010064][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1229.010313][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1229.010589][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1229.010827][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1229.011098][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1229.011341][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1229.011606][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1229.011861][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1229.012166][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1229.012412][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1229.012662][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1229.012930][ T11] kthread (kernel/kthread.c:388) 
[ 1229.013152][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1229.013404][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1229.013638][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1229.013874][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1253.935098][   T11] ------------[ cut here ]------------
| [ 1253.935443][   T11] sysfs group 'bridge' not found for kobject 'br1'
| [ 1253.935855][ T11] WARNING: CPU: 2 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1253.936392][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1253.938047][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1253.938718][   T11] Workqueue: netns cleanup_net
[ 1253.938979][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1253.939350][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1253.940458][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1253.940808][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1253.941269][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1253.941688][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1253.942115][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800bbd2628
[ 1253.942530][   T11] R13: ffff88800bbd2df8 R14: ffffc900000bfc98 R15: ffff88800bbd2bc0
[ 1253.943032][   T11] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[ 1253.943508][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1253.943857][   T11] CR2: 00007f9ccaee7270 CR3: 0000000030134006 CR4: 00000000001706f0
[ 1253.944290][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1253.944703][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1253.945196][   T11] Call Trace:
[ 1253.945390][   T11]  <TASK>
[ 1253.945579][ T11] ? __warn (kernel/panic.c:677) 
[ 1253.945815][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1253.946126][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1253.946425][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1253.946672][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1253.946908][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1253.947176][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1253.947447][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1253.947687][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1253.947963][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1253.948225][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1253.948507][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1253.948743][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1253.949076][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1253.949397][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1253.949651][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1253.949965][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1253.950268][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1253.950590][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1253.950875][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1253.951156][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1253.951509][ T11] kthread (kernel/kthread.c:388) 
[ 1253.951742][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1253.952016][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1253.952259][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1253.952500][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1253.955661][   T11] ------------[ cut here ]------------
| [ 1253.955989][   T11] sysfs group 'bridge' not found for kobject 'br2'
| [ 1253.956433][ T11] WARNING: CPU: 2 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1253.956988][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1253.958691][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1253.959420][   T11] Workqueue: netns cleanup_net
[ 1253.959724][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1253.960102][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1253.961239][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1253.961555][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1253.961964][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1253.962391][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1253.962841][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800bb52628
[ 1253.963302][   T11] R13: ffff88800bb52df8 R14: ffffc900000bfc98 R15: ffff88800bb52bc0
[ 1253.963777][   T11] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[ 1253.964408][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1253.964816][   T11] CR2: 00007f9ccaee7270 CR3: 0000000030134006 CR4: 00000000001706f0
[ 1253.965304][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1253.965773][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1253.966250][   T11] Call Trace:
[ 1253.966440][   T11]  <TASK>
[ 1253.966633][ T11] ? __warn (kernel/panic.c:677) 
[ 1253.966890][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1253.967202][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1253.967501][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1253.967775][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1253.968010][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1253.968292][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1253.968593][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1253.968871][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1253.969187][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1253.969482][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1253.969775][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1253.970085][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1253.970360][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1253.970648][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1253.970943][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1253.971335][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1253.971632][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1253.971970][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1253.972236][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1253.972490][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1253.972760][ T11] kthread (kernel/kthread.c:388) 
[ 1253.972976][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1253.973232][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1253.973467][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1253.973712][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1253.977026][   T11] ------------[ cut here ]------------
| [ 1253.977361][   T11] sysfs group 'bridge' not found for kobject 'br3'
| [ 1253.977806][ T11] WARNING: CPU: 2 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1253.978331][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1253.979975][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1253.980744][   T11] Workqueue: netns cleanup_net
[ 1253.981137][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1253.981446][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1253.982620][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1253.982993][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1253.983556][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1253.983968][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1253.984452][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800c85a628
[ 1253.984933][   T11] R13: ffff88800c85adf8 R14: ffffc900000bfc98 R15: ffff88800c85abc0
[ 1253.985433][   T11] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[ 1253.985948][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1253.986341][   T11] CR2: 00007f9ccaee7270 CR3: 0000000030134006 CR4: 00000000001706f0
[ 1253.986756][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1253.987188][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1253.987604][   T11] Call Trace:
[ 1253.987778][   T11]  <TASK>
[ 1253.987936][ T11] ? __warn (kernel/panic.c:677) 
[ 1253.988167][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1253.988419][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1253.988711][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1253.988953][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1253.989224][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1253.989512][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1253.989809][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1253.990112][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1253.990453][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1253.990724][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1253.991056][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1253.991303][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1253.991576][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1253.991895][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1253.992165][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1253.992476][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1253.992804][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1253.993118][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1253.993385][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1253.993636][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1253.993903][ T11] kthread (kernel/kthread.c:388) 
[ 1253.994133][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1253.994377][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1253.994651][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1253.994921][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1254.387309][   T11] ------------[ cut here ]------------
| [ 1254.387666][   T11] sysfs group 'bridge' not found for kobject 'br1'
| [ 1254.388089][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1254.388571][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1254.390141][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1254.390794][   T11] Workqueue: netns cleanup_net
[ 1254.391053][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1254.391354][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1254.392343][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1254.392655][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1254.393065][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1254.393473][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1254.393881][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800287a628
[ 1254.394363][   T11] R13: ffff88800287adf8 R14: ffffc900000bfc98 R15: ffff88800287abc0
[ 1254.394782][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[ 1254.395256][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1254.395617][   T11] CR2: 00007fc068e4f000 CR3: 0000000030134002 CR4: 00000000001706f0
[ 1254.396029][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1254.396438][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1254.396847][   T11] Call Trace:
[ 1254.397029][   T11]  <TASK>
[ 1254.397199][ T11] ? __warn (kernel/panic.c:677) 
[ 1254.397418][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1254.397675][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1254.397952][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1254.398205][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1254.398449][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1254.398699][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1254.398976][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1254.399223][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1254.399505][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1254.399760][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1254.400052][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1254.400292][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1254.400558][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1254.400816][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1254.401087][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1254.401346][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1254.401622][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1254.401862][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1254.402114][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1254.402379][ T11] kthread (kernel/kthread.c:388) 
[ 1254.402606][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1254.402852][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1254.403096][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1254.403340][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1254.406323][   T11] ------------[ cut here ]------------
| [ 1254.406738][   T11] sysfs group 'bridge' not found for kobject 'br2'
| [ 1254.407136][ T11] WARNING: CPU: 1 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1254.407625][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1254.409274][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1254.409996][   T11] Workqueue: netns cleanup_net
[ 1254.410291][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1254.410599][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1254.411624][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1254.411950][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1254.412373][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1254.412845][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1254.413271][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800ab2a628
[ 1254.413689][   T11] R13: ffff88800ab2adf8 R14: ffffc900000bfc98 R15: ffff88800ab2abc0
[ 1254.414115][   T11] FS:  0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000
[ 1254.414583][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1254.414925][   T11] CR2: 00007f8d51981270 CR3: 0000000030134001 CR4: 00000000001706f0
[ 1254.415351][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1254.415839][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1254.416304][   T11] Call Trace:
[ 1254.416530][   T11]  <TASK>
[ 1254.416719][ T11] ? __warn (kernel/panic.c:677) 
[ 1254.416952][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1254.417256][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1254.417584][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1254.417856][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1254.418148][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1254.418421][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1254.418757][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1254.419014][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1254.419354][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1254.419629][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1254.419962][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1254.420232][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1254.420541][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1254.420825][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1254.421109][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1254.421408][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1254.421753][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1254.422017][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1254.422315][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1254.422597][ T11] kthread (kernel/kthread.c:388) 
[ 1254.422835][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1254.423108][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1254.423366][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1254.423659][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1254.426792][   T11] ------------[ cut here ]------------
| [ 1254.427117][   T11] sysfs group 'bridge' not found for kobject 'br3'
| [ 1254.427484][ T11] WARNING: CPU: 0 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [ 1254.427964][   T11] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel poly1305_generic libpoly1305 chacha_generic libchacha chacha20poly1305 tls sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[ 1254.429502][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1254.430166][   T11] Workqueue: netns cleanup_net
[ 1254.430424][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1254.430735][ T11] Code: 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 45 48 8b 33 48 c7 c7 a0 a7 9c ae e8 60 65 5e ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 e9 c7 da ff
All code
========
   0:	89 d9                	mov    %ebx,%ecx
   2:	49 8b 14 24          	mov    (%r12),%rdx
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df 
  10:	48 c1 e9 03          	shr    $0x3,%rcx
  14:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1)
  18:	75 45                	jne    0x5f
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 a0 a7 9c ae 	mov    $0xffffffffae9ca7a0,%rdi
  24:	e8 60 65 5e ff       	call   0xffffffffff5e6589
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	48 83 c4 08          	add    $0x8,%rsp
  32:	5b                   	pop    %rbx
  33:	5d                   	pop    %rbp
  34:	41 5c                	pop    %r12
  36:	c3                   	ret
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	cc                   	int3
  3b:	e8 e9 c7 da ff       	call   0xffffffffffdac829

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	5b                   	pop    %rbx
   9:	5d                   	pop    %rbp
   a:	41 5c                	pop    %r12
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	e8 e9 c7 da ff       	call   0xffffffffffdac7ff
[ 1254.431758][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[ 1254.432090][   T11] RAX: 0000000000000000 RBX: ffffffffaedbe220 RCX: ffffffffabd1056f
[ 1254.432505][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[ 1254.432993][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[ 1254.433484][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800c8c2628
[ 1254.433939][   T11] R13: ffff88800c8c2df8 R14: ffffc900000bfc98 R15: ffff88800c8c2bc0
[ 1254.434395][   T11] FS:  0000000000000000(0000) GS:ffff888035200000(0000) knlGS:0000000000000000
[ 1254.434910][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1254.435268][   T11] CR2: 00007fff55f2ac98 CR3: 0000000006816006 CR4: 00000000001706f0
[ 1254.435726][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1254.436190][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1254.436642][   T11] Call Trace:
[ 1254.436839][   T11]  <TASK>
[ 1254.437015][ T11] ? __warn (kernel/panic.c:677) 
[ 1254.437291][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 1254.437579][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1254.437884][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1254.438173][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1254.438442][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1254.438733][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1254.439033][ T11] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 1254.439310][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 1254.439643][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 1254.439924][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 1254.440241][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 1254.440512][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1254.440817][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1254.441110][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 1254.441406][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 1254.441705][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1254.442043][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 1254.442317][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1254.442589][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1254.442899][ T11] kthread (kernel/kthread.c:388) 
[ 1254.443166][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1254.443446][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 1254.443707][ T11] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
dump_stack_lvl:print_report:kasan_report:kobject_put
refcount_warn_saturate:br_sysfs_delbr:br_dev_delete:br_net_exit_batch_rtnl
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net
sysfs_remove_group:br_dev_delete:br_net_exit_batch_rtnl:cleanup_net