======================================
| [   33.852660][   T11] ==================================================================
| [ 33.853102][ T11] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:729) 
| [   33.853488][   T11] Read of size 1 at addr ffff8880047a1bfc by task kworker/u8:0/11
| [   33.853901][   T11]
[   33.854454][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   33.855098][   T11] Workqueue: netns cleanup_net
[   33.855362][   T11] Call Trace:
[   33.855548][   T11]  <TASK>
[ 33.855707][ T11] dump_stack_lvl (lib/dump_stack.c:107) 
[ 33.855959][ T11] print_address_description.constprop.0 (mm/kasan/report.c:378) 
[ 33.856344][ T11] ? kobject_put (lib/kobject.c:729) 
[ 33.856596][ T11] print_report (mm/kasan/report.c:489) 
[ 33.856833][ 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) 
[ 33.857105][ T11] kasan_report (mm/kasan/report.c:603) 
[ 33.857339][ T11] ? kobject_put (lib/kobject.c:729) 
[ 33.857612][ T11] kobject_put (lib/kobject.c:729) 
[ 33.857841][ T11] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) 
[ 33.858111][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 33.858401][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 33.858752][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 33.859013][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 33.859346][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 33.859635][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 33.859911][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 33.860188][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 33.860465][ 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) 
[ 33.860745][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 33.861088][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 33.861370][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 33.861642][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 33.861941][ T11] kthread (kernel/kthread.c:388) 
[ 33.862220][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 33.862496][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 33.862753][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 33.863052][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   33.883892][   T11] ------------[ cut here ]------------
| [   33.884224][   T11] refcount_t: underflow; use-after-free.
| [ 33.884596][ T11] WARNING: CPU: 3 PID: 11 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
| [   33.885176][   T11] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   33.886401][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   33.887179][   T11] Workqueue: netns cleanup_net
[ 33.887441][ T11] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 33.887836][ 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 42 a7 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 42 a7 	mov    $0xffffffffa7427a20,%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
[   33.888871][   T11] RSP: 0018:ffffc900000bfb98 EFLAGS: 00010282
[   33.889193][   T11] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffa471056f
[   33.889620][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   33.890037][   T11] RBP: 0000000000000003 R08: 0000000000000000 R09: fffff52000017f18
[   33.890495][   T11] R10: ffffc900000bf8c7 R11: 205d313154202020 R12: ffff888008902000
[   33.891022][   T11] R13: ffff888008902df8 R14: ffffc900000bfc98 R15: ffff888008902bc0
[   33.891468][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[   33.891946][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   33.892325][   T11] CR2: 00007f5bd3ba8000 CR3: 000000002ad34006 CR4: 00000000001706f0
[   33.892794][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   33.893245][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   33.893732][   T11] Call Trace:
[   33.893927][   T11]  <TASK>
[ 33.894111][ T11] ? __warn (kernel/panic.c:677) 
[ 33.894332][ T11] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 33.894667][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 33.894937][ T11] ? vprintk_emit (kernel/printk/printk.c:2313) 
[ 33.895228][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 33.895494][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 33.895782][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 33.896076][ 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) 
[ 33.896364][ T11] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 33.896733][ T11] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 33.897057][ T11] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) 
[ 33.897326][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 33.897610][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 33.897931][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 33.898192][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 33.898526][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 33.898791][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 33.899042][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 33.899321][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 33.899646][ 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) 
[ 33.899925][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 33.900249][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 33.900508][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 33.900761][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 33.901033][ T11] kthread (kernel/kthread.c:388) 
[ 33.901255][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 33.901514][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 33.901752][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 33.902000][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   33.905316][   T11] ------------[ cut here ]------------
| [   33.905750][   T11] sysfs group 'bridge' not found for kobject 'br0'
| [ 33.906263][ T11] WARNING: CPU: 0 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   33.906808][   T11] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   33.907982][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   33.908679][   T11] Workqueue: netns cleanup_net
[ 33.908991][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 33.909312][ 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 3c a7 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 3c a7 	mov    $0xffffffffa73ca7a0,%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
[   33.910335][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[   33.910679][   T11] RAX: 0000000000000000 RBX: ffffffffa77be220 RCX: ffffffffa471056f
[   33.911109][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   33.911556][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[   33.912027][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff888008902628
[   33.912565][   T11] R13: ffff888008902df8 R14: ffffc900000bfc98 R15: ffff888008902bc0
[   33.913042][   T11] FS:  0000000000000000(0000) GS:ffff888035200000(0000) knlGS:0000000000000000
[   33.913525][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   33.913877][   T11] CR2: 00007ffc02b1c8c8 CR3: 0000000006fc4005 CR4: 00000000001706f0
[   33.914298][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   33.914729][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   33.915201][   T11] Call Trace:
[   33.915395][   T11]  <TASK>
[ 33.915638][ T11] ? __warn (kernel/panic.c:677) 
[ 33.915864][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 33.916127][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 33.916456][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 33.916753][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 33.917014][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 33.917285][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 33.917602][ 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) 
[ 33.917868][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 33.918283][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 33.918615][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 33.918941][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 33.919213][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 33.919561][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 33.919877][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 33.920184][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 33.920493][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 33.920815][ 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) 
[ 33.921070][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 33.921410][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 33.921707][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 33.921992][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 33.922306][ T11] kthread (kernel/kthread.c:388) 
[ 33.922567][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 33.922840][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 33.923119][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 33.923405][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   34.084793][   T11] ------------[ cut here ]------------
| [   34.085096][   T11] sysfs group 'bridge' not found for kobject 'br0'
| [ 34.085475][ T11] WARNING: CPU: 0 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   34.085982][   T11] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   34.087020][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   34.087713][   T11] Workqueue: netns cleanup_net
[ 34.087982][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 34.088293][ 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 3c a7 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 3c a7 	mov    $0xffffffffa73ca7a0,%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
[   34.089417][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[   34.089791][   T11] RAX: 0000000000000000 RBX: ffffffffa77be220 RCX: ffffffffa471056f
[   34.090272][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   34.090783][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[   34.091269][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff888008382628
[   34.091737][   T11] R13: ffff888008382df8 R14: ffffc900000bfc98 R15: ffff888008382bc0
[   34.092220][   T11] FS:  0000000000000000(0000) GS:ffff888035200000(0000) knlGS:0000000000000000
[   34.092775][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   34.093206][   T11] CR2: 00007ffc02b1cf28 CR3: 0000000006fc4006 CR4: 00000000001706f0
[   34.093672][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   34.094152][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   34.094646][   T11] Call Trace:
[   34.094846][   T11]  <TASK>
[ 34.095069][ T11] ? __warn (kernel/panic.c:677) 
[ 34.095325][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 34.095598][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 34.095876][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 34.096122][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 34.096353][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 34.096614][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 34.096892][ 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) 
[ 34.097128][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 34.097476][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 34.097762][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 34.098101][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 34.098402][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 34.098705][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 34.099034][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 34.099325][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 34.099650][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 34.099983][ 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) 
[ 34.100267][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 34.100636][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 34.100962][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 34.101283][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 34.101607][ T11] kthread (kernel/kthread.c:388) 
[ 34.101853][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 34.102155][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 34.102473][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 34.102800][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   51.941589][   T11] ------------[ cut here ]------------
| [   51.941970][   T11] sysfs group 'bridge' not found for kobject 'br0'
| [ 51.942402][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   51.942994][   T11] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   51.944168][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   51.944869][   T11] Workqueue: netns cleanup_net
[ 51.945178][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 51.945548][ 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 3c a7 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 3c a7 	mov    $0xffffffffa73ca7a0,%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
[   51.946780][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[   51.947150][   T11] RAX: 0000000000000000 RBX: ffffffffa77be220 RCX: ffffffffa471056f
[   51.947643][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   51.948124][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[   51.948640][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff8880094ca628
[   51.949075][   T11] R13: ffff8880094cadf8 R14: ffffc900000bfc98 R15: ffff8880094cabc0
[   51.949493][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[   51.949971][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   51.950324][   T11] CR2: 00007fb3766ef000 CR3: 0000000007f62003 CR4: 00000000001706f0
[   51.950747][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   51.951224][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   51.951738][   T11] Call Trace:
[   51.951933][   T11]  <TASK>
[ 51.952133][ T11] ? __warn (kernel/panic.c:677) 
[ 51.952401][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 51.952710][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 51.953024][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 51.953327][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 51.953584][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 51.953895][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 51.954226][ 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) 
[ 51.954479][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 51.954792][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 51.955103][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 51.955409][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 51.955694][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 51.956020][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 51.956300][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 51.956652][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 51.956974][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 51.957262][ 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) 
[ 51.957552][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 51.957918][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 51.958217][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 51.958471][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 51.958752][ T11] kthread (kernel/kthread.c:388) 
[ 51.958973][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 51.959219][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 51.959461][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 51.959716][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   52.125737][   T11] ------------[ cut here ]------------
| [   52.126035][   T11] sysfs group 'bridge' not found for kobject 'br0'
| [ 52.126409][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   52.126902][   T11] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   52.127926][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   52.128689][   T11] Workqueue: netns cleanup_net
[ 52.128974][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 52.129375][ 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 3c a7 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 3c a7 	mov    $0xffffffffa73ca7a0,%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
[   52.130531][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[   52.130909][   T11] RAX: 0000000000000000 RBX: ffffffffa77be220 RCX: ffffffffa471056f
[   52.131416][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   52.131899][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[   52.132382][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff888006f12628
[   52.132822][   T11] R13: ffff888006f12df8 R14: ffffc900000bfc98 R15: ffff888006f12bc0
[   52.133247][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[   52.133765][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   52.134187][   T11] CR2: 00007fb3766ef000 CR3: 0000000007f62003 CR4: 00000000001706f0
[   52.134685][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   52.135189][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   52.135653][   T11] Call Trace:
[   52.135869][   T11]  <TASK>
[ 52.136059][ T11] ? __warn (kernel/panic.c:677) 
[ 52.136293][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 52.136598][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 52.136926][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 52.137212][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 52.137485][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 52.137776][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 52.138098][ 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) 
[ 52.138336][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 52.138618][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 52.138868][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 52.139148][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 52.139388][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 52.139644][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 52.139909][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 52.140163][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 52.140438][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 52.140750][ 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) 
[ 52.141045][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 52.141369][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 52.141645][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 52.141976][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 52.142283][ T11] kthread (kernel/kthread.c:388) 
[ 52.142560][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 52.142849][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 52.143109][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 52.143380][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   67.781684][   T11] ------------[ cut here ]------------
| [   67.782047][   T11] sysfs group 'bridge' not found for kobject 'br0'
| [ 67.782448][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   67.783019][   T11] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   67.784259][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   67.784963][   T11] Workqueue: netns cleanup_net
[ 67.785226][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 67.785544][ 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 3c a7 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 3c a7 	mov    $0xffffffffa73ca7a0,%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
[   67.786571][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[   67.786966][   T11] RAX: 0000000000000000 RBX: ffffffffa77be220 RCX: ffffffffa471056f
[   67.787451][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   67.787972][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[   67.788482][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff888005a52628
[   67.788948][   T11] R13: ffff888005a52df8 R14: ffffc900000bfc98 R15: ffff888005a52bc0
[   67.789451][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[   67.789991][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   67.790406][   T11] CR2: 0000556fc1def0f0 CR3: 000000002ad34004 CR4: 00000000001706f0
[   67.790903][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   67.791396][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   67.791899][   T11] Call Trace:
[   67.792114][   T11]  <TASK>
[ 67.792294][ T11] ? __warn (kernel/panic.c:677) 
[ 67.792574][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 67.792896][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 67.793213][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 67.793507][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 67.793817][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 67.794103][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 67.794412][ 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) 
[ 67.794708][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 67.795049][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 67.795329][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 67.795615][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 67.795855][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 67.796107][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 67.796369][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 67.796633][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 67.796907][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 67.797200][ 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) 
[ 67.797504][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 67.797841][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 67.798091][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 67.798346][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 67.798626][ T11] kthread (kernel/kthread.c:388) 
[ 67.798848][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 67.799094][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 67.799335][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 67.799588][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   67.966467][   T11] ------------[ cut here ]------------
| [   67.966813][   T11] sysfs group 'bridge' not found for kobject 'br0'
| [ 67.967208][ T11] WARNING: CPU: 1 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   67.967749][   T11] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   67.968870][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   67.969524][   T11] Workqueue: netns cleanup_net
[ 67.969785][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 67.970097][ 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 3c a7 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 3c a7 	mov    $0xffffffffa73ca7a0,%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
[   67.971245][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[   67.971622][   T11] RAX: 0000000000000000 RBX: ffffffffa77be220 RCX: ffffffffa471056f
[   67.972080][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   67.972527][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[   67.973001][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff88800944a628
[   67.973452][   T11] R13: ffff88800944adf8 R14: ffffc900000bfc98 R15: ffff88800944abc0
[   67.973926][   T11] FS:  0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000
[   67.974442][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   67.974824][   T11] CR2: 00007ffc02b1cf28 CR3: 0000000006fc4005 CR4: 00000000001706f0
[   67.975273][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   67.975700][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   67.976120][   T11] Call Trace:
[   67.976300][   T11]  <TASK>
[ 67.976462][ T11] ? __warn (kernel/panic.c:677) 
[ 67.976688][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 67.976954][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 67.977262][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 67.977544][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 67.977784][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 67.978036][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 67.978310][ 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) 
[ 67.978557][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 67.978840][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 67.979092][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 67.979378][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 67.979629][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 67.979882][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 67.980167][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 67.980445][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 67.980768][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 67.981057][ 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) 
[ 67.981318][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 67.981644][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 67.981911][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 67.982224][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 67.982533][ T11] kthread (kernel/kthread.c:388) 
[ 67.982783][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 67.983083][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 67.983345][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 67.983625][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   84.423653][   T11] ------------[ cut here ]------------
| [   84.424056][   T11] sysfs group 'bridge' not found for kobject 'br0'
| [ 84.424485][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   84.425065][   T11] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   84.426356][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   84.427017][   T11] Workqueue: netns cleanup_net
[ 84.427320][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 84.427709][ 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 3c a7 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 3c a7 	mov    $0xffffffffa73ca7a0,%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
[   84.428732][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[   84.429055][   T11] RAX: 0000000000000000 RBX: ffffffffa77be220 RCX: ffffffffa471056f
[   84.429472][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   84.429897][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[   84.430317][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff8880076b2628
[   84.430807][   T11] R13: ffff8880076b2df8 R14: ffffc900000bfc98 R15: ffff8880076b2bc0
[   84.431278][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[   84.431856][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   84.432258][   T11] CR2: 00007fe328d8e0e0 CR3: 000000002ad34003 CR4: 00000000001706f0
[   84.432743][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   84.433298][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   84.433779][   T11] Call Trace:
[   84.434018][   T11]  <TASK>
[ 84.434204][ T11] ? __warn (kernel/panic.c:677) 
[ 84.434429][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 84.434696][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 84.434973][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 84.435215][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 84.435447][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 84.435708][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 84.435979][ 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) 
[ 84.436245][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 84.436577][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 84.436856][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 84.437139][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 84.437378][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 84.437635][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 84.437910][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 84.438157][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 84.438429][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 84.438701][ 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) 
[ 84.438944][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 84.439232][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 84.439509][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 84.439842][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 84.440118][ T11] kthread (kernel/kthread.c:388) 
[ 84.440369][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 84.440660][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 84.440933][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 84.441211][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   84.597786][   T11] ------------[ cut here ]------------
| [   84.598157][   T11] sysfs group 'bridge' not found for kobject 'br0'
| [ 84.598583][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   84.599141][   T11] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   84.600223][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   84.600874][   T11] Workqueue: netns cleanup_net
[ 84.601135][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 84.601445][ 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 3c a7 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 3c a7 	mov    $0xffffffffa73ca7a0,%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
[   84.602637][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[   84.603063][   T11] RAX: 0000000000000000 RBX: ffffffffa77be220 RCX: ffffffffa471056f
[   84.603532][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   84.604042][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[   84.604481][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff8880063da628
[   84.604908][   T11] R13: ffff8880063dadf8 R14: ffffc900000bfc98 R15: ffff8880063dabc0
[   84.605326][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[   84.605803][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   84.606155][   T11] CR2: 00007f7909691000 CR3: 000000002ad34003 CR4: 00000000001706f0
[   84.606580][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   84.607091][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   84.607541][   T11] Call Trace:
[   84.607727][   T11]  <TASK>
[ 84.607884][ T11] ? __warn (kernel/panic.c:677) 
[ 84.608103][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 84.608365][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 84.608646][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 84.608891][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 84.609125][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 84.609376][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 84.609651][ 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) 
[ 84.609909][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 84.610278][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 84.610558][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 84.610863][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 84.611121][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 84.611442][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 84.611743][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 84.612033][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 84.612400][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 84.612707][ 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) 
[ 84.612955][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 84.613239][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 84.613484][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 84.613745][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 84.614021][ T11] kthread (kernel/kthread.c:388) 
[ 84.614240][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 84.614489][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 84.614732][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 84.615077][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  124.074839][   T11] ------------[ cut here ]------------
| [  124.075200][   T11] sysfs group 'bridge' not found for kobject 'br0'
| [ 124.075613][ T11] WARNING: CPU: 1 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  124.076103][   T11] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[  124.077291][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  124.078016][   T11] Workqueue: netns cleanup_net
[ 124.078309][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 124.078655][ 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 3c a7 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 3c a7 	mov    $0xffffffffa73ca7a0,%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
[  124.079782][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[  124.080131][   T11] RAX: 0000000000000000 RBX: ffffffffa77be220 RCX: ffffffffa471056f
[  124.080593][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[  124.081074][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[  124.081509][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff888006262628
[  124.081987][   T11] R13: ffff888006262df8 R14: ffffc900000bfc98 R15: ffff888006262bc0
[  124.082443][   T11] FS:  0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000
[  124.082945][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  124.083296][   T11] CR2: 00007fda607dc270 CR3: 000000002ad34004 CR4: 00000000001706f0
[  124.083729][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  124.084151][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  124.084578][   T11] Call Trace:
[  124.084758][   T11]  <TASK>
[ 124.084916][ T11] ? __warn (kernel/panic.c:677) 
[ 124.085134][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 124.085392][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 124.085680][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 124.085927][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 124.086159][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 124.086408][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 124.086711][ 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) 
[ 124.086977][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 124.087290][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 124.087553][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 124.087839][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 124.088078][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 124.088335][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 124.088606][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 124.088858][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 124.089133][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 124.089404][ 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) 
[ 124.089658][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 124.089946][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 124.090218][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 124.090513][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 124.090795][ T11] kthread (kernel/kthread.c:388) 
[ 124.091038][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 124.091317][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 124.091600][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 124.091890][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  124.259250][   T11] ------------[ cut here ]------------
| [  124.259640][   T11] sysfs group 'bridge' not found for kobject 'br0'
| [ 124.260014][ T11] WARNING: CPU: 3 PID: 11 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  124.260527][   T11] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[  124.261774][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  124.262522][   T11] Workqueue: netns cleanup_net
[ 124.262847][ T11] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 124.263215][ 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 3c a7 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 3c a7 	mov    $0xffffffffa73ca7a0,%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
[  124.264478][   T11] RSP: 0018:ffffc900000bfba0 EFLAGS: 00010282
[  124.264860][   T11] RAX: 0000000000000000 RBX: ffffffffa77be220 RCX: ffffffffa471056f
[  124.265324][   T11] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[  124.265747][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff52000017f19
[  124.266168][   T11] R10: ffffc900000bf8cf R11: 205d313154202020 R12: ffff8880080e2628
[  124.266597][   T11] R13: ffff8880080e2df8 R14: ffffc900000bfc98 R15: ffff8880080e2bc0
[  124.267014][   T11] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[  124.267536][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  124.267934][   T11] CR2: 00007f745b847270 CR3: 000000002ad34005 CR4: 00000000001706f0
[  124.268435][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  124.268924][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  124.269421][   T11] Call Trace:
[  124.269619][   T11]  <TASK>
[ 124.269825][ T11] ? __warn (kernel/panic.c:677) 
[ 124.270084][ T11] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 124.270382][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 124.270727][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 124.271013][ T11] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 124.271279][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 124.271589][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 124.271904][ 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) 
[ 124.272173][ T11] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 124.272511][ T11] br_dev_delete (net/bridge/br_if.c:396) 
[ 124.272799][ T11] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 124.273106][ T11] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 124.273429][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 124.273713][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 124.274045][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 124.274325][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 124.274651][ T11] process_one_work (kernel/workqueue.c:2638) 
[ 124.274956][ 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) 
[ 124.275245][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 124.275568][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 124.275856][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 124.276179][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 124.276474][ T11] kthread (kernel/kthread.c:388) 
[ 124.276721][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 124.276996][ T11] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 124.277296][ 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