======================================
| [   35.088515][   T70] ==================================================================
| [ 35.089030][ T70] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:729) 
| [   35.089455][   T70] Read of size 1 at addr ffff8880051d947c by task kworker/u8:1/70
| [   35.089940][   T70]
[   35.090551][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   35.091239][   T70] Workqueue: netns cleanup_net
[   35.091529][   T70] Call Trace:
[   35.091723][   T70]  <TASK>
[ 35.091905][ T70] dump_stack_lvl (lib/dump_stack.c:107) 
[ 35.092163][ T70] print_address_description.constprop.0 (mm/kasan/report.c:378) 
[ 35.092552][ T70] ? kobject_put (lib/kobject.c:729) 
[ 35.092823][ T70] print_report (mm/kasan/report.c:489) 
[ 35.093108][ T70] ? 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) 
[ 35.093384][ T70] kasan_report (mm/kasan/report.c:603) 
[ 35.093648][ T70] ? kobject_put (lib/kobject.c:729) 
[ 35.093891][ T70] kobject_put (lib/kobject.c:729) 
[ 35.094127][ T70] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) 
[ 35.094371][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 35.094620][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 35.094907][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 35.095143][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 35.095447][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 35.095713][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 35.095969][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 35.096260][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 35.096538][ T70] ? 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) 
[ 35.096814][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 35.097139][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 35.097405][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 35.097694][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 35.098077][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 35.098367][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 35.098701][ T70] kthread (kernel/kthread.c:388) 
[ 35.098928][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 35.099175][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 35.099445][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 35.099744][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   35.120223][   T70] ------------[ cut here ]------------
| [   35.120549][   T70] refcount_t: underflow; use-after-free.
| [ 35.120885][ T70] WARNING: CPU: 2 PID: 70 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
| [   35.121424][   T70] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   35.122546][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   35.123247][   T70] Workqueue: netns cleanup_net
[ 35.123530][ T70] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 35.123879][ T70] 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 62 b3 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 62 b3 	mov    $0xffffffffb3627a20,%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
[   35.125014][   T70] RSP: 0018:ffffc9000050fb98 EFLAGS: 00010282
[   35.125348][   T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffb091056f
[   35.125834][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   35.126284][   T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffff520000a1f18
[   35.126733][   T70] R10: ffffc9000050f8c7 R11: 205d303754202020 R12: ffff888006a22000
[   35.127168][   T70] R13: ffff888006a22df8 R14: ffffc9000050fc98 R15: ffff888006a22bc0
[   35.127587][   T70] FS:  0000000000000000(0000) GS:ffff88802ee00000(0000) knlGS:0000000000000000
[   35.128173][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   35.128542][   T70] CR2: 00007fddb02134f0 CR3: 000000003cb34004 CR4: 00000000001706f0
[   35.128985][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   35.129410][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   35.129856][   T70] Call Trace:
[   35.130034][   T70]  <TASK>
[ 35.130204][ T70] ? __warn (kernel/panic.c:677) 
[ 35.130426][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 35.130721][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 35.130963][ T70] ? vprintk_emit (kernel/printk/printk.c:2313) 
[ 35.131218][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 35.131453][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 35.131709][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 35.131983][ T70] ? 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) 
[ 35.132264][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 35.132559][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 35.132854][ T70] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) 
[ 35.133103][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 35.133360][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 35.133672][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 35.133911][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 35.134232][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 35.134501][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 35.134753][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 35.135062][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 35.135385][ T70] ? 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) 
[ 35.135629][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 35.135967][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 35.136258][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 35.136543][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 35.136962][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 35.137254][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 35.137586][ T70] kthread (kernel/kthread.c:388) 
[ 35.137859][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 35.138202][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 35.138461][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 35.138711][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   35.141926][   T70] ------------[ cut here ]------------
| [   35.142235][   T70] sysfs group 'bridge' not found for kobject 'br0'
| [ 35.142634][ T70] WARNING: CPU: 2 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   35.143186][   T70] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   35.144310][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   35.145025][   T70] Workqueue: netns cleanup_net
[ 35.145326][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 35.145725][ T70] 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 5c b3 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 5c b3 	mov    $0xffffffffb35ca7a0,%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
[   35.146862][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[   35.147215][   T70] RAX: 0000000000000000 RBX: ffffffffb39be220 RCX: ffffffffb091056f
[   35.147670][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   35.148101][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[   35.148523][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff888006a22628
[   35.148945][   T70] R13: ffff888006a22df8 R14: ffffc9000050fc98 R15: ffff888006a22bc0
[   35.149376][   T70] FS:  0000000000000000(0000) GS:ffff88802ee00000(0000) knlGS:0000000000000000
[   35.149946][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   35.150345][   T70] CR2: 00007fddb02134f0 CR3: 000000003cb34004 CR4: 00000000001706f0
[   35.150820][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   35.151292][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   35.151743][   T70] Call Trace:
[   35.151948][   T70]  <TASK>
[ 35.152132][ T70] ? __warn (kernel/panic.c:677) 
[ 35.152380][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 35.152668][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 35.152992][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 35.153262][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 35.153539][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 35.153847][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 35.154157][ T70] ? 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) 
[ 35.154439][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 35.154749][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 35.155029][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 35.155324][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 35.155630][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 35.155956][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 35.156242][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 35.156526][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 35.156835][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 35.157136][ T70] ? 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) 
[ 35.157407][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 35.157757][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 35.158021][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 35.158332][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 35.158731][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 35.159015][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 35.159329][ T70] kthread (kernel/kthread.c:388) 
[ 35.159573][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 35.159845][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 35.160088][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 35.160340][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   35.290666][   T70] ------------[ cut here ]------------
| [   35.291093][   T70] sysfs group 'bridge' not found for kobject 'br0'
| [ 35.291485][ T70] WARNING: CPU: 3 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   35.291985][   T70] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   35.293287][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   35.294062][   T70] Workqueue: netns cleanup_net
[ 35.294341][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 35.294704][ T70] 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 5c b3 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 5c b3 	mov    $0xffffffffb35ca7a0,%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
[   35.295981][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[   35.296455][   T70] RAX: 0000000000000000 RBX: ffffffffb39be220 RCX: ffffffffb091056f
[   35.296920][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   35.297431][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[   35.297988][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff888006f7a628
[   35.298489][   T70] R13: ffff888006f7adf8 R14: ffffc9000050fc98 R15: ffff888006f7abc0
[   35.299071][   T70] FS:  0000000000000000(0000) GS:ffff88802f200000(0000) knlGS:0000000000000000
[   35.299628][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   35.300023][   T70] CR2: 00007fe33a706270 CR3: 0000000004e96006 CR4: 00000000001706f0
[   35.300616][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   35.301121][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   35.301639][   T70] Call Trace:
[   35.301902][   T70]  <TASK>
[ 35.302069][ T70] ? __warn (kernel/panic.c:677) 
[ 35.302331][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 35.302648][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 35.303053][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 35.303319][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 35.303553][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 35.303817][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 35.304112][ T70] ? 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) 
[ 35.304444][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 35.304735][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 35.304984][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 35.305344][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 35.305692][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 35.305971][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 35.306287][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 35.306590][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 35.306988][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 35.307325][ T70] ? 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) 
[ 35.307605][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 35.307948][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 35.308310][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 35.308612][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 35.309006][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 35.309343][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 35.309739][ T70] kthread (kernel/kthread.c:388) 
[ 35.309991][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 35.310281][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 35.310539][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 35.310907][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   52.619793][   T70] ------------[ cut here ]------------
| [   52.620114][   T70] sysfs group 'bridge' not found for kobject 'br0'
| [ 52.620547][ T70] WARNING: CPU: 3 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   52.621119][   T70] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   52.622364][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   52.623148][   T70] Workqueue: netns cleanup_net
[ 52.623444][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 52.623800][ T70] 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 5c b3 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 5c b3 	mov    $0xffffffffb35ca7a0,%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
[   52.624995][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[   52.625389][   T70] RAX: 0000000000000000 RBX: ffffffffb39be220 RCX: ffffffffb091056f
[   52.625877][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   52.626386][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[   52.626856][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff888008972628
[   52.627352][   T70] R13: ffff888008972df8 R14: ffffc9000050fc98 R15: ffff888008972bc0
[   52.627842][   T70] FS:  0000000000000000(0000) GS:ffff88802f200000(0000) knlGS:0000000000000000
[   52.628392][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   52.628785][   T70] CR2: 000055835abf60f0 CR3: 000000003cb34002 CR4: 00000000001706f0
[   52.629295][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   52.629761][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   52.630279][   T70] Call Trace:
[   52.630466][   T70]  <TASK>
[ 52.630629][ T70] ? __warn (kernel/panic.c:677) 
[ 52.630853][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 52.631127][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 52.631421][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 52.631675][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 52.631915][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 52.632181][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 52.632457][ T70] ? 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) 
[ 52.632703][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 52.632986][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 52.633249][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 52.633539][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 52.633782][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 52.634052][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 52.634382][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 52.634677][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 52.634977][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 52.635260][ T70] ? 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) 
[ 52.635518][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 52.635815][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 52.636071][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 52.636332][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 52.636689][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 52.636966][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 52.637344][ T70] kthread (kernel/kthread.c:388) 
[ 52.637672][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 52.638038][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 52.638375][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 52.638751][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   52.819995][   T70] ------------[ cut here ]------------
| [   52.820348][   T70] sysfs group 'bridge' not found for kobject 'br0'
| [ 52.820757][ T70] WARNING: CPU: 2 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   52.821335][   T70] Modules linked in: act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   52.822493][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   52.823234][   T70] Workqueue: netns cleanup_net
[ 52.823498][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 52.823845][ T70] 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 5c b3 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 5c b3 	mov    $0xffffffffb35ca7a0,%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
[   52.824919][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[   52.825252][   T70] RAX: 0000000000000000 RBX: ffffffffb39be220 RCX: ffffffffb091056f
[   52.825674][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   52.826113][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[   52.826574][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff88803e572628
[   52.827063][   T70] R13: ffff88803e572df8 R14: ffffc9000050fc98 R15: ffff88803e572bc0
[   52.827531][   T70] FS:  0000000000000000(0000) GS:ffff88802ee00000(0000) knlGS:0000000000000000
[   52.828100][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   52.828513][   T70] CR2: 00007f08d9bdc000 CR3: 000000003cb34005 CR4: 00000000001706f0
[   52.828984][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   52.829463][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   52.829950][   T70] Call Trace:
[   52.830142][   T70]  <TASK>
[ 52.830302][ T70] ? __warn (kernel/panic.c:677) 
[ 52.830525][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 52.830794][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 52.831082][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 52.831330][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 52.831563][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 52.831814][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 52.832149][ T70] ? 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) 
[ 52.832423][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 52.832721][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 52.832973][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 52.833267][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 52.833510][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 52.833769][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 52.834050][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 52.834311][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 52.834588][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 52.834857][ T70] ? 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) 
[ 52.835111][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 52.835402][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 52.835692][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 52.836003][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 52.836379][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 52.836673][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 52.836967][ T70] kthread (kernel/kthread.c:388) 
[ 52.837228][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 52.837505][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 52.837789][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 52.838043][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   69.544635][   T70] ------------[ cut here ]------------
| [   69.544975][   T70] sysfs group 'bridge' not found for kobject 'br0'
| [ 69.545408][ T70] WARNING: CPU: 0 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   69.545954][   T70] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   69.547139][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   69.547821][   T70] Workqueue: netns cleanup_net
[ 69.548122][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 69.548465][ T70] 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 5c b3 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 5c b3 	mov    $0xffffffffb35ca7a0,%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
[   69.549554][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[   69.549908][   T70] RAX: 0000000000000000 RBX: ffffffffb39be220 RCX: ffffffffb091056f
[   69.550385][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   69.550852][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[   69.551327][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff8880059ba628
[   69.551783][   T70] R13: ffff8880059badf8 R14: ffffc9000050fc98 R15: ffff8880059babc0
[   69.552256][   T70] FS:  0000000000000000(0000) GS:ffff88802e600000(0000) knlGS:0000000000000000
[   69.552775][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   69.553170][   T70] CR2: 00007f41561c50e0 CR3: 000000003e7fa003 CR4: 00000000001706f0
[   69.553620][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   69.554107][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   69.554579][   T70] Call Trace:
[   69.554760][   T70]  <TASK>
[ 69.554922][ T70] ? __warn (kernel/panic.c:677) 
[ 69.555156][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 69.555419][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 69.555702][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 69.555956][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 69.556205][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 69.556467][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 69.556740][ T70] ? 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) 
[ 69.556980][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 69.557346][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 69.557625][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 69.557954][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 69.558215][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 69.558510][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 69.558812][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 69.559101][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 69.559417][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 69.559726][ T70] ? 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) 
[ 69.560007][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 69.560337][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 69.560635][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 69.560912][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 69.561300][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 69.561618][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 69.561920][ T70] kthread (kernel/kthread.c:388) 
[ 69.562190][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 69.562489][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 69.562767][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 69.563043][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   69.758565][   T70] ------------[ cut here ]------------
| [   69.758911][   T70] sysfs group 'bridge' not found for kobject 'br0'
| [ 69.759356][ T70] WARNING: CPU: 0 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   69.759879][   T70] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   69.761146][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   69.761836][   T70] Workqueue: netns cleanup_net
[ 69.762137][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 69.762487][ T70] 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 5c b3 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 5c b3 	mov    $0xffffffffb35ca7a0,%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
[   69.763587][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[   69.763971][   T70] RAX: 0000000000000000 RBX: ffffffffb39be220 RCX: ffffffffb091056f
[   69.764445][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   69.764913][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[   69.765400][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff8880053ea628
[   69.765861][   T70] R13: ffff8880053eadf8 R14: ffffc9000050fc98 R15: ffff8880053eabc0
[   69.766319][   T70] FS:  0000000000000000(0000) GS:ffff88802e600000(0000) knlGS:0000000000000000
[   69.766838][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   69.767244][   T70] CR2: 00007fe0cebb2270 CR3: 000000003cb34001 CR4: 00000000001706f0
[   69.767702][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   69.768160][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   69.768632][   T70] Call Trace:
[   69.768825][   T70]  <TASK>
[ 69.769019][ T70] ? __warn (kernel/panic.c:677) 
[ 69.769284][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 69.769568][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 69.769889][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 69.770200][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 69.770475][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 69.770751][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 69.771085][ T70] ? 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) 
[ 69.771336][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 69.771650][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 69.771947][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 69.772241][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 69.772485][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 69.772745][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 69.773015][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 69.773274][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 69.773552][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 69.773823][ T70] ? 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) 
[ 69.774110][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 69.774443][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 69.774744][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 69.775036][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 69.775421][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 69.775735][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 69.776064][ T70] kthread (kernel/kthread.c:388) 
[ 69.776334][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 69.776610][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 69.776859][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 69.777146][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   86.782551][   T70] ------------[ cut here ]------------
| [   86.782909][   T70] sysfs group 'bridge' not found for kobject 'br0'
| [ 86.783356][ T70] WARNING: CPU: 0 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   86.783909][   T70] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   86.785161][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   86.785869][   T70] Workqueue: netns cleanup_net
[ 86.786186][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 86.786534][ T70] 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 5c b3 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 5c b3 	mov    $0xffffffffb35ca7a0,%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
[   86.787634][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[   86.788026][   T70] RAX: 0000000000000000 RBX: ffffffffb39be220 RCX: ffffffffb091056f
[   86.788489][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   86.788945][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[   86.789414][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff888005a32628
[   86.789888][   T70] R13: ffff888005a32df8 R14: ffffc9000050fc98 R15: ffff888005a32bc0
[   86.790371][   T70] FS:  0000000000000000(0000) GS:ffff88802e600000(0000) knlGS:0000000000000000
[   86.790879][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   86.791268][   T70] CR2: 000055835abf60f0 CR3: 000000003cb34001 CR4: 00000000001706f0
[   86.791737][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   86.792210][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   86.792653][   T70] Call Trace:
[   86.792866][   T70]  <TASK>
[ 86.793032][ T70] ? __warn (kernel/panic.c:677) 
[ 86.793292][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 86.793584][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 86.793903][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 86.794197][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 86.794476][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 86.794767][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 86.795063][ T70] ? 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) 
[ 86.795347][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 86.795668][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 86.795959][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 86.796269][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 86.796519][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 86.796803][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 86.797097][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 86.797370][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 86.797692][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 86.797986][ T70] ? 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) 
[ 86.798283][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 86.798613][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 86.798895][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 86.799153][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 86.799508][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 86.799784][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 86.800057][ T70] kthread (kernel/kthread.c:388) 
[ 86.800284][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 86.800530][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 86.800773][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 86.801021][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   86.994253][   T70] ------------[ cut here ]------------
| [   86.994618][   T70] sysfs group 'bridge' not found for kobject 'br0'
| [ 86.995062][ T70] WARNING: CPU: 3 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   86.995602][   T70] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[   86.996855][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   86.997596][   T70] Workqueue: netns cleanup_net
[ 86.997896][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 86.998250][ T70] 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 5c b3 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 5c b3 	mov    $0xffffffffb35ca7a0,%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
[   86.999381][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[   86.999741][   T70] RAX: 0000000000000000 RBX: ffffffffb39be220 RCX: ffffffffb091056f
[   87.000233][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   87.000723][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[   87.001232][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff8880089ca628
[   87.001701][   T70] R13: ffff8880089cadf8 R14: ffffc9000050fc98 R15: ffff8880089cabc0
[   87.002133][   T70] FS:  0000000000000000(0000) GS:ffff88802f200000(0000) knlGS:0000000000000000
[   87.002608][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   87.002963][   T70] CR2: 00007f4febed7000 CR3: 000000003cb34001 CR4: 00000000001706f0
[   87.003403][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   87.003905][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   87.004377][   T70] Call Trace:
[   87.004598][   T70]  <TASK>
[ 87.004796][ T70] ? __warn (kernel/panic.c:677) 
[ 87.005025][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 87.005298][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 87.005582][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 87.005836][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 87.006084][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 87.006342][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 87.006623][ T70] ? 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) 
[ 87.006894][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 87.007227][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 87.007544][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 87.007835][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 87.008085][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 87.008350][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 87.008621][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 87.008872][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 87.009160][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 87.009441][ T70] ? 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) 
[ 87.009691][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 87.009989][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 87.010253][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 87.010538][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 87.010954][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 87.011245][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 87.011561][ T70] kthread (kernel/kthread.c:388) 
[ 87.011801][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 87.012082][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 87.012373][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 87.012658][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  126.813195][   T70] ------------[ cut here ]------------
| [  126.813506][   T70] sysfs group 'bridge' not found for kobject 'br0'
| [ 126.813902][ T70] WARNING: CPU: 3 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  126.814409][   T70] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[  126.815596][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  126.816358][   T70] Workqueue: netns cleanup_net
[ 126.816681][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 126.817053][ T70] 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 5c b3 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 5c b3 	mov    $0xffffffffb35ca7a0,%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
[  126.818290][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[  126.818664][   T70] RAX: 0000000000000000 RBX: ffffffffb39be220 RCX: ffffffffb091056f
[  126.819175][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[  126.819671][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[  126.820172][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff88800965a628
[  126.820663][   T70] R13: ffff88800965adf8 R14: ffffc9000050fc98 R15: ffff88800965abc0
[  126.821171][   T70] FS:  0000000000000000(0000) GS:ffff88802f200000(0000) knlGS:0000000000000000
[  126.821708][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  126.822061][   T70] CR2: 00007f04b92b90e8 CR3: 00000000010a8004 CR4: 00000000001706f0
[  126.822496][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  126.822920][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  126.823352][   T70] Call Trace:
[  126.823533][   T70]  <TASK>
[ 126.823698][ T70] ? __warn (kernel/panic.c:677) 
[ 126.823930][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 126.824199][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 126.824483][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 126.824737][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 126.825011][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 126.825325][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 126.825649][ T70] ? 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) 
[ 126.825926][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 126.826280][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 126.826589][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 126.826919][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 126.827233][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 126.827534][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 126.827837][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 126.828168][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 126.828475][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 126.828791][ T70] ? 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) 
[ 126.829124][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 126.829446][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 126.829730][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 126.830018][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 126.830485][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 126.830810][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 126.831143][ T70] kthread (kernel/kthread.c:388) 
[ 126.831403][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 126.831694][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 126.831984][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 126.832280][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  127.032792][   T70] ------------[ cut here ]------------
| [  127.033129][   T70] sysfs group 'bridge' not found for kobject 'br0'
| [ 127.033575][ T70] WARNING: CPU: 3 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  127.034156][   T70] Modules linked in: cls_matchall act_gact cls_flower sch_ingress vxlan ip6_udp_tunnel udp_tunnel
[  127.035377][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  127.036088][   T70] Workqueue: netns cleanup_net
[ 127.036409][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 127.036769][ T70] 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 5c b3 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 5c b3 	mov    $0xffffffffb35ca7a0,%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
[  127.037966][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[  127.038374][   T70] RAX: 0000000000000000 RBX: ffffffffb39be220 RCX: ffffffffb091056f
[  127.038853][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[  127.039372][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[  127.039854][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff88803e21a628
[  127.040359][   T70] R13: ffff88803e21adf8 R14: ffffc9000050fc98 R15: ffff88803e21abc0
[  127.040837][   T70] FS:  0000000000000000(0000) GS:ffff88802f200000(0000) knlGS:0000000000000000
[  127.041373][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  127.041840][   T70] CR2: 00007fb9e990d270 CR3: 000000003cb34001 CR4: 00000000001706f0
[  127.042273][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  127.042703][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  127.043136][   T70] Call Trace:
[  127.043319][   T70]  <TASK>
[ 127.043484][ T70] ? __warn (kernel/panic.c:677) 
[ 127.043720][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 127.043986][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 127.044294][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 127.044562][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 127.044833][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 127.045137][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 127.045443][ T70] ? 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) 
[ 127.045686][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 127.045967][ T70] br_dev_delete (net/bridge/br_if.c:396) 
[ 127.046226][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[ 127.046514][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 127.046755][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 127.047014][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 127.047287][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 127.047586][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 127.047915][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 127.048246][ T70] ? 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) 
[ 127.048495][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 127.048786][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 127.049038][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 127.049298][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 127.049655][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 127.049934][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 127.050215][ T70] kthread (kernel/kthread.c:388) 
[ 127.050437][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 127.050685][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 127.050929][ T70] ? __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