======================================
| [   35.983408][   T69] ==================================================================
| [ 35.983852][ T69] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:729) 
| [   35.984304][   T69] Read of size 1 at addr ffff8880052fccfc by task kworker/u8:1/69
| [   35.984734][   T69]
[   35.985329][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   35.985973][   T69] Workqueue: netns cleanup_net
[   35.986261][   T69] Call Trace:
[   35.986472][   T69]  <TASK>
[ 35.986652][ T69] dump_stack_lvl (lib/dump_stack.c:107) 
[ 35.986912][ T69] print_address_description.constprop.0 (mm/kasan/report.c:378) 
[ 35.987287][ T69] ? kobject_put (lib/kobject.c:729) 
[ 35.987555][ T69] print_report (mm/kasan/report.c:489) 
[ 35.987817][ T69] ? 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) 
[ 35.988091][ T69] kasan_report (mm/kasan/report.c:603) 
[ 35.988349][ T69] ? kobject_put (lib/kobject.c:729) 
[ 35.988596][ T69] kobject_put (lib/kobject.c:729) 
[ 35.988845][ T69] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) 
[ 35.989088][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 35.989337][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 35.989614][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 35.989852][ T69] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 35.990148][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 35.990413][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 35.990660][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 35.990930][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 35.991197][ T69] ? 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) 
[ 35.991436][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 35.991718][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 35.991960][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 35.992231][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 35.992597][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 35.992897][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 35.993203][ T69] kthread (kernel/kthread.c:388) 
[ 35.993438][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 35.993701][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 35.993964][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 35.994226][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   36.014382][   T69] ------------[ cut here ]------------
| [   36.014683][   T69] refcount_t: underflow; use-after-free.
| [ 36.015059][ T69] WARNING: CPU: 2 PID: 69 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
| [   36.015544][   T69] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   36.016572][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   36.017252][   T69] Workqueue: netns cleanup_net
[ 36.017540][ T69] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 36.017881][ T69] 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 82 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 82 ae 	mov    $0xffffffffae827a20,%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
[   36.018969][   T69] RSP: 0018:ffffc900004ffb98 EFLAGS: 00010282
[   36.019313][   T69] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffabb1056f
[   36.019746][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   36.020209][   T69] RBP: 0000000000000003 R08: 0000000000000000 R09: fffff5200009ff18
[   36.020691][   T69] R10: ffffc900004ff8c7 R11: 205d393654202020 R12: ffff8880060da000
[   36.021142][   T69] R13: ffff8880060dadf8 R14: ffffc900004ffc98 R15: ffff8880060dabc0
[   36.021559][   T69] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[   36.022028][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   36.022386][   T69] CR2: 00007ffd72afd628 CR3: 0000000007a9a004 CR4: 00000000001706f0
[   36.022799][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   36.023220][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   36.023707][   T69] Call Trace:
[   36.023904][   T69]  <TASK>
[ 36.024071][ T69] ? __warn (kernel/panic.c:677) 
[ 36.024328][ T69] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 36.024617][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 36.024856][ T69] ? vprintk_emit (kernel/printk/printk.c:2313) 
[ 36.025112][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 36.025341][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 36.025636][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 36.025937][ T69] ? 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) 
[ 36.026278][ T69] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 36.026572][ T69] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 36.026865][ T69] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) 
[ 36.027116][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 36.027364][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 36.027645][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 36.027882][ T69] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 36.028188][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 36.028452][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 36.028699][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 36.028969][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 36.029288][ T69] ? 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) 
[ 36.029601][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 36.029886][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 36.030164][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 36.030465][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 36.030845][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 36.031158][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 36.031464][ T69] kthread (kernel/kthread.c:388) 
[ 36.031719][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 36.032028][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 36.032310][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 36.032579][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   36.035614][   T69] ------------[ cut here ]------------
| [   36.035902][   T69] sysfs group 'bridge' not found for kobject 'br0'
| [ 36.036283][ T69] WARNING: CPU: 2 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   36.036766][   T69] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   36.037864][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   36.038617][   T69] Workqueue: netns cleanup_net
[ 36.038873][ T69] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 36.039231][ T69] 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 7c 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 7c ae 	mov    $0xffffffffae7ca7a0,%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
[   36.040432][   T69] RSP: 0018:ffffc900004ffba0 EFLAGS: 00010282
[   36.040782][   T69] RAX: 0000000000000000 RBX: ffffffffaebbe220 RCX: ffffffffabb1056f
[   36.041296][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   36.041786][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009ff19
[   36.042265][   T69] R10: ffffc900004ff8cf R11: 205d393654202020 R12: ffff8880060da628
[   36.042752][   T69] R13: ffff8880060dadf8 R14: ffffc900004ffc98 R15: ffff8880060dabc0
[   36.043254][   T69] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[   36.043786][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   36.044182][   T69] CR2: 00007ffd72afd628 CR3: 0000000012f34003 CR4: 00000000001706f0
[   36.044685][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   36.045160][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   36.045642][   T69] Call Trace:
[   36.045832][   T69]  <TASK>
[ 36.046024][ T69] ? __warn (kernel/panic.c:677) 
[ 36.046293][ T69] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 36.046569][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 36.046872][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 36.047231][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 36.047464][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 36.047741][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 36.048007][ T69] ? 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) 
[ 36.048247][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 36.048525][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 36.048772][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 36.049057][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 36.049297][ T69] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 36.049593][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 36.049878][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 36.050199][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 36.050500][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 36.050784][ T69] ? 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) 
[ 36.051075][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 36.051397][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 36.051653][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 36.051980][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 36.052382][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 36.052676][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 36.052997][ T69] kthread (kernel/kthread.c:388) 
[ 36.053227][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 36.053481][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 36.053777][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 36.054075][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   36.203186][   T69] ------------[ cut here ]------------
| [   36.203551][   T69] sysfs group 'bridge' not found for kobject 'br0'
| [ 36.203970][ T69] WARNING: CPU: 3 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   36.204570][   T69] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   36.205735][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   36.206509][   T69] Workqueue: netns cleanup_net
[ 36.206800][ T69] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 36.207168][ T69] 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 7c 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 7c ae 	mov    $0xffffffffae7ca7a0,%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
[   36.208337][   T69] RSP: 0018:ffffc900004ffba0 EFLAGS: 00010282
[   36.208680][   T69] RAX: 0000000000000000 RBX: ffffffffaebbe220 RCX: ffffffffabb1056f
[   36.209109][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   36.209526][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009ff19
[   36.209941][   T69] R10: ffffc900004ff8cf R11: 205d393654202020 R12: ffff888007b9a628
[   36.210395][   T69] R13: ffff888007b9adf8 R14: ffffc900004ffc98 R15: ffff888007b9abc0
[   36.210851][   T69] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[   36.211389][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   36.211767][   T69] CR2: 00007f45c0a44000 CR3: 0000000012f34004 CR4: 00000000001706f0
[   36.212278][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   36.212772][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   36.213241][   T69] Call Trace:
[   36.213435][   T69]  <TASK>
[ 36.213599][ T69] ? __warn (kernel/panic.c:677) 
[ 36.213845][ T69] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 36.214164][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 36.214441][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 36.214703][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 36.214933][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 36.215186][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 36.215454][ T69] ? 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) 
[ 36.215691][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 36.215969][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 36.216225][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 36.216534][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 36.216813][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 36.217088][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 36.217351][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 36.217600][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 36.217877][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 36.218148][ T69] ? 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) 
[ 36.218394][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 36.218684][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 36.218934][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 36.219190][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 36.219538][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 36.219820][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 36.220143][ T69] kthread (kernel/kthread.c:388) 
[ 36.220372][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 36.220631][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 36.220881][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 36.221156][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   53.896377][   T69] ------------[ cut here ]------------
| [   53.896711][   T69] sysfs group 'bridge' not found for kobject 'br0'
| [ 53.897134][ T69] WARNING: CPU: 2 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   53.897675][   T69] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   53.898811][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   53.899482][   T69] Workqueue: netns cleanup_net
[ 53.899741][ T69] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 53.900089][ T69] 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 7c 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 7c ae 	mov    $0xffffffffae7ca7a0,%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
[   53.901236][   T69] RSP: 0018:ffffc900004ffba0 EFLAGS: 00010282
[   53.901599][   T69] RAX: 0000000000000000 RBX: ffffffffaebbe220 RCX: ffffffffabb1056f
[   53.902036][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   53.902470][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009ff19
[   53.902884][   T69] R10: ffffc900004ff8cf R11: 205d393654202020 R12: ffff8880020e2628
[   53.903312][   T69] R13: ffff8880020e2df8 R14: ffffc900004ffc98 R15: ffff8880020e2bc0
[   53.903765][   T69] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[   53.904326][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   53.904707][   T69] CR2: 00007f96dc2a8a30 CR3: 0000000012f34002 CR4: 00000000001706f0
[   53.905176][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   53.905627][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   53.906102][   T69] Call Trace:
[   53.906304][   T69]  <TASK>
[ 53.906490][ T69] ? __warn (kernel/panic.c:677) 
[ 53.906726][ T69] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 53.907014][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 53.907340][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 53.907613][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 53.907872][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 53.908161][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 53.908469][ T69] ? 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) 
[ 53.908737][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 53.909054][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 53.909337][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 53.909655][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 53.909916][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 53.910198][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 53.910487][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 53.910769][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 53.911073][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 53.911349][ T69] ? 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) 
[ 53.911592][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 53.911897][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 53.912173][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 53.912427][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 53.912774][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 53.913054][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 53.913365][ T69] kthread (kernel/kthread.c:388) 
[ 53.913616][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 53.913906][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 53.914147][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 53.914400][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   54.089395][   T69] ------------[ cut here ]------------
| [   54.089737][   T69] sysfs group 'bridge' not found for kobject 'br0'
| [ 54.090127][ T69] WARNING: CPU: 0 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   54.090621][   T69] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   54.091771][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   54.092479][   T69] Workqueue: netns cleanup_net
[ 54.092785][ T69] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 54.093134][ T69] 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 7c 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 7c ae 	mov    $0xffffffffae7ca7a0,%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
[   54.094222][   T69] RSP: 0018:ffffc900004ffba0 EFLAGS: 00010282
[   54.094595][   T69] RAX: 0000000000000000 RBX: ffffffffaebbe220 RCX: ffffffffabb1056f
[   54.095065][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   54.095507][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009ff19
[   54.096007][   T69] R10: ffffc900004ff8cf R11: 205d393654202020 R12: ffff88800931a628
[   54.096498][   T69] R13: ffff88800931adf8 R14: ffffc900004ffc98 R15: ffff88800931abc0
[   54.096972][   T69] FS:  0000000000000000(0000) GS:ffff888035200000(0000) knlGS:0000000000000000
[   54.097478][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   54.097888][   T69] CR2: 00007fd1ab76c270 CR3: 0000000012f34005 CR4: 00000000001706f0
[   54.098365][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   54.098829][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   54.099280][   T69] Call Trace:
[   54.099476][   T69]  <TASK>
[ 54.099667][ T69] ? __warn (kernel/panic.c:677) 
[ 54.099911][ T69] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 54.100205][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 54.100524][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 54.100828][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 54.101123][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 54.101428][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 54.101754][ T69] ? 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) 
[ 54.102079][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 54.102403][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 54.102707][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 54.103062][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 54.103330][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 54.103642][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 54.103962][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 54.104257][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 54.104558][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 54.104868][ T69] ? 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) 
[ 54.105169][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 54.105499][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 54.105809][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 54.106113][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 54.106519][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 54.106828][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 54.107139][ T69] kthread (kernel/kthread.c:388) 
[ 54.107402][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 54.107703][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 54.107986][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 54.108246][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   70.222056][   T69] ------------[ cut here ]------------
| [   70.222533][   T69] sysfs group 'bridge' not found for kobject 'br0'
| [ 70.223130][ T69] WARNING: CPU: 2 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   70.223926][   T69] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   70.225528][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   70.226523][   T69] Workqueue: netns cleanup_net
[ 70.226964][ T69] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 70.227478][ T69] 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 7c 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 7c ae 	mov    $0xffffffffae7ca7a0,%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
[   70.229096][   T69] RSP: 0018:ffffc900004ffba0 EFLAGS: 00010282
[   70.229435][   T69] RAX: 0000000000000000 RBX: ffffffffaebbe220 RCX: ffffffffabb1056f
[   70.229909][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   70.230586][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009ff19
[   70.231227][   T69] R10: ffffc900004ff8cf R11: 205d393654202020 R12: ffff88800918a628
[   70.231854][   T69] R13: ffff88800918adf8 R14: ffffc900004ffc98 R15: ffff88800918abc0
[   70.232499][   T69] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[   70.233326][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   70.233893][   T69] CR2: 00007fe56c84ad40 CR3: 000000000768e003 CR4: 00000000001706f0
[   70.234584][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   70.235287][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   70.235985][   T69] Call Trace:
[   70.236198][   T69]  <TASK>
[ 70.236364][ T69] ? __warn (kernel/panic.c:677) 
[ 70.236607][ T69] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 70.236909][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 70.237205][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 70.237493][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 70.237736][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 70.238027][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 70.238321][ T69] ? 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) 
[ 70.238594][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 70.238894][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 70.239262][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 70.239542][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 70.239780][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 70.240039][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 70.240310][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 70.240558][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 70.240872][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 70.241160][ T69] ? 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) 
[ 70.241412][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 70.241691][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 70.241956][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 70.242213][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 70.242554][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 70.242824][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 70.243107][ T69] kthread (kernel/kthread.c:388) 
[ 70.243327][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 70.243570][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 70.243807][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 70.244112][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   70.401738][   T69] ------------[ cut here ]------------
| [   70.402065][   T69] sysfs group 'bridge' not found for kobject 'br0'
| [ 70.402437][ T69] WARNING: CPU: 1 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   70.402918][   T69] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   70.403995][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   70.404664][   T69] Workqueue: netns cleanup_net
[ 70.404926][ T69] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 70.405259][ T69] 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 7c 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 7c ae 	mov    $0xffffffffae7ca7a0,%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
[   70.406392][   T69] RSP: 0018:ffffc900004ffba0 EFLAGS: 00010282
[   70.406737][   T69] RAX: 0000000000000000 RBX: ffffffffaebbe220 RCX: ffffffffabb1056f
[   70.407205][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   70.407678][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009ff19
[   70.408124][   T69] R10: ffffc900004ff8cf R11: 205d393654202020 R12: ffff88800838a628
[   70.408607][   T69] R13: ffff88800838adf8 R14: ffffc900004ffc98 R15: ffff88800838abc0
[   70.409051][   T69] FS:  0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000
[   70.409566][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   70.409947][   T69] CR2: 00007ffd72afd628 CR3: 0000000007a9a001 CR4: 00000000001706f0
[   70.410439][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   70.410922][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   70.411395][   T69] Call Trace:
[   70.411591][   T69]  <TASK>
[ 70.411774][ T69] ? __warn (kernel/panic.c:677) 
[ 70.412038][ T69] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 70.412327][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 70.412601][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 70.412840][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 70.413084][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 70.413340][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 70.413607][ T69] ? 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) 
[ 70.413842][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 70.414129][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 70.414394][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 70.414717][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 70.414990][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 70.415256][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 70.415569][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 70.415834][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 70.416143][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 70.416458][ T69] ? 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) 
[ 70.416710][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 70.417031][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 70.417297][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 70.417565][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 70.417967][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 70.418285][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 70.418572][ T69] kthread (kernel/kthread.c:388) 
[ 70.418831][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 70.419105][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 70.419345][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 70.419595][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   87.191352][   T69] ------------[ cut here ]------------
| [   87.191713][   T69] sysfs group 'bridge' not found for kobject 'br0'
| [ 87.192160][ T69] WARNING: CPU: 0 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   87.192690][   T69] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   87.193912][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   87.194616][   T69] Workqueue: netns cleanup_net
[ 87.194927][ T69] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 87.195271][ T69] 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 7c 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 7c ae 	mov    $0xffffffffae7ca7a0,%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
[   87.196356][   T69] RSP: 0018:ffffc900004ffba0 EFLAGS: 00010282
[   87.196742][   T69] RAX: 0000000000000000 RBX: ffffffffaebbe220 RCX: ffffffffabb1056f
[   87.197201][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   87.197641][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009ff19
[   87.198111][   T69] R10: ffffc900004ff8cf R11: 205d393654202020 R12: ffff888005f82628
[   87.198574][   T69] R13: ffff888005f82df8 R14: ffffc900004ffc98 R15: ffff888005f82bc0
[   87.199035][   T69] FS:  0000000000000000(0000) GS:ffff888035200000(0000) knlGS:0000000000000000
[   87.199534][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   87.199937][   T69] CR2: 00007f4d8abbe270 CR3: 0000000012f34004 CR4: 00000000001706f0
[   87.200411][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   87.200870][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   87.201321][   T69] Call Trace:
[   87.201514][   T69]  <TASK>
[ 87.201696][ T69] ? __warn (kernel/panic.c:677) 
[ 87.201966][ T69] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 87.202257][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 87.202560][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 87.202845][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 87.203123][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 87.203429][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 87.203722][ T69] ? 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) 
[ 87.203992][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 87.204312][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 87.204604][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 87.204902][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 87.205150][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 87.205403][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 87.205665][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 87.205916][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 87.206195][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 87.206461][ T69] ? 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) 
[ 87.206705][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 87.206992][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 87.207242][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 87.207491][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 87.207897][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 87.208214][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 87.208516][ T69] kthread (kernel/kthread.c:388) 
[ 87.208759][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 87.209036][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 87.209303][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 87.209599][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   87.414053][   T69] ------------[ cut here ]------------
| [   87.414354][   T69] sysfs group 'bridge' not found for kobject 'br0'
| [ 87.414729][ T69] WARNING: CPU: 2 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   87.415218][   T69] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   87.416310][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   87.417017][   T69] Workqueue: netns cleanup_net
[ 87.417296][ T69] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 87.417630][ T69] 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 7c 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 7c ae 	mov    $0xffffffffae7ca7a0,%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
[   87.418754][   T69] RSP: 0018:ffffc900004ffba0 EFLAGS: 00010282
[   87.419107][   T69] RAX: 0000000000000000 RBX: ffffffffaebbe220 RCX: ffffffffabb1056f
[   87.419566][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   87.420017][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009ff19
[   87.420484][   T69] R10: ffffc900004ff8cf R11: 205d393654202020 R12: ffff8880079a2628
[   87.420936][   T69] R13: ffff8880079a2df8 R14: ffffc900004ffc98 R15: ffff8880079a2bc0
[   87.421404][   T69] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[   87.421931][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   87.422307][   T69] CR2: 00007efeabdec000 CR3: 0000000012f34002 CR4: 00000000001706f0
[   87.422787][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   87.423239][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   87.423720][   T69] Call Trace:
[   87.423915][   T69]  <TASK>
[ 87.424095][ T69] ? __warn (kernel/panic.c:677) 
[ 87.424341][ T69] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 87.424631][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 87.424905][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 87.425151][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 87.425381][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 87.425630][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 87.425897][ T69] ? 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) 
[ 87.426139][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 87.426416][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 87.426662][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 87.426940][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 87.427185][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 87.427433][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 87.427696][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 87.427948][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 87.428226][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 87.428523][ T69] ? 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) 
[ 87.428775][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 87.429086][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 87.429333][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 87.429587][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 87.429934][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 87.430210][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 87.430479][ T69] kthread (kernel/kthread.c:388) 
[ 87.430698][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 87.430941][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 87.431182][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 87.431427][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  127.056125][   T69] ------------[ cut here ]------------
| [  127.056432][   T69] sysfs group 'bridge' not found for kobject 'br0'
| [ 127.056805][ T69] WARNING: CPU: 1 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  127.057323][   T69] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[  127.058506][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  127.059193][   T69] Workqueue: netns cleanup_net
[ 127.059450][ T69] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 127.059764][ T69] 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 7c 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 7c ae 	mov    $0xffffffffae7ca7a0,%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
[  127.060883][   T69] RSP: 0018:ffffc900004ffba0 EFLAGS: 00010282
[  127.061232][   T69] RAX: 0000000000000000 RBX: ffffffffaebbe220 RCX: ffffffffabb1056f
[  127.061709][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[  127.062177][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009ff19
[  127.062647][   T69] R10: ffffc900004ff8cf R11: 205d393654202020 R12: ffff8880061ea628
[  127.063114][   T69] R13: ffff8880061eadf8 R14: ffffc900004ffc98 R15: ffff8880061eabc0
[  127.063568][   T69] FS:  0000000000000000(0000) GS:ffff888035600000(0000) knlGS:0000000000000000
[  127.064084][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  127.064456][   T69] CR2: 0000564cfde230f0 CR3: 0000000012f34003 CR4: 00000000001706f0
[  127.064909][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  127.065332][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  127.065751][   T69] Call Trace:
[  127.065930][   T69]  <TASK>
[ 127.066097][ T69] ? __warn (kernel/panic.c:677) 
[ 127.066317][ T69] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 127.066576][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 127.066884][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 127.067162][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 127.067418][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 127.067691][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 127.067983][ T69] ? 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) 
[ 127.068341][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 127.068790][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 127.069208][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 127.069636][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 127.070028][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 127.070423][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 127.070860][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 127.071266][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 127.071732][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 127.072154][ T69] ? 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) 
[ 127.072549][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 127.072976][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 127.073342][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 127.073706][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 127.074089][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 127.074360][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 127.074629][ T69] kthread (kernel/kthread.c:388) 
[ 127.074856][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 127.075180][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 127.075434][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 127.075693][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  127.281165][   T69] ------------[ cut here ]------------
| [  127.281525][   T69] sysfs group 'bridge' not found for kobject 'br0'
| [ 127.281965][ T69] WARNING: CPU: 2 PID: 69 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  127.282541][   T69] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[  127.283668][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  127.284326][   T69] Workqueue: netns cleanup_net
[ 127.284586][ T69] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 127.284892][ T69] 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 7c 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 7c ae 	mov    $0xffffffffae7ca7a0,%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
[  127.286080][   T69] RSP: 0018:ffffc900004ffba0 EFLAGS: 00010282
[  127.286455][   T69] RAX: 0000000000000000 RBX: ffffffffaebbe220 RCX: ffffffffabb1056f
[  127.286915][   T69] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[  127.287436][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff5200009ff19
[  127.287946][   T69] R10: ffffc900004ff8cf R11: 205d393654202020 R12: ffff8880063a2628
[  127.288404][   T69] R13: ffff8880063a2df8 R14: ffffc900004ffc98 R15: ffff8880063a2bc0
[  127.288890][   T69] FS:  0000000000000000(0000) GS:ffff888035a00000(0000) knlGS:0000000000000000
[  127.289426][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  127.289831][   T69] CR2: 00007f3e94f8b000 CR3: 0000000012f34005 CR4: 00000000001706f0
[  127.290310][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  127.290813][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  127.291280][   T69] Call Trace:
[  127.291503][   T69]  <TASK>
[ 127.291726][ T69] ? __warn (kernel/panic.c:677) 
[ 127.291979][ T69] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 127.292241][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 127.292518][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 127.292800][ T69] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 127.293071][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 127.293345][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 127.293661][ T69] ? 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) 
[ 127.293934][ T69] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 127.294256][ T69] br_dev_delete (net/bridge/br_if.c:396) 
[ 127.294502][ T69] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 127.294782][ T69] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 127.295030][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 127.295301][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 127.295565][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 127.295812][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 127.296099][ T69] process_one_work (kernel/workqueue.c:2638) 
[ 127.296367][ T69] ? 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) 
[ 127.296666][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 127.297003][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 127.297295][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 127.297588][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 127.297974][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 127.298270][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 127.298578][ T69] kthread (kernel/kthread.c:388) 
[ 127.298822][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 127.299099][ T69] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 127.299362][ T69] ? __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