======================================
| [  356.459207] ------------[ cut here ]------------
| [  356.459744] refcount_t: underflow; use-after-free.
| [  356.460343] WARNING: CPU: 2 PID: 10 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
| [  356.461230] Modules linked in: act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  356.462798] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  356.463418] Workqueue: netns cleanup_net
[  356.463645] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 356.463937] Code: 0b 90 90 c3 cc cc cc cc 80 3d 69 d4 67 01 00 0f 85 75 ff ff ff c6 05 5c d4 67 01 01 90 48 c7 c7 e8 37 d3 8c e8 a1 26 b4 ff 90 <0f> 0b 90 90 c3 cc cc cc cc 80 3d 3c d4 67 01 00 0f 85 4a ff ff ff
All code
========
   0:	0b 90 90 c3 cc cc    	or     -0x33333c70(%rax),%edx
   6:	cc                   	int3
   7:	cc                   	int3
   8:	80 3d 69 d4 67 01 00 	cmpb   $0x0,0x167d469(%rip)        # 0x167d478
   f:	0f 85 75 ff ff ff    	jne    0xffffffffffffff8a
  15:	c6 05 5c d4 67 01 01 	movb   $0x1,0x167d45c(%rip)        # 0x167d478
  1c:	90                   	nop
  1d:	48 c7 c7 e8 37 d3 8c 	mov    $0xffffffff8cd337e8,%rdi
  24:	e8 a1 26 b4 ff       	call   0xffffffffffb426ca
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	c3                   	ret
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	80 3d 3c d4 67 01 00 	cmpb   $0x0,0x167d43c(%rip)        # 0x167d476
  3a:	0f 85 4a ff ff ff    	jne    0xffffffffffffff8a

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	80 3d 3c d4 67 01 00 	cmpb   $0x0,0x167d43c(%rip)        # 0x167d44c
  10:	0f 85 4a ff ff ff    	jne    0xffffffffffffff60
[  356.464946] RSP: 0018:ffffa6170005bd78 EFLAGS: 00010286
[  356.465234] RAX: 0000000000000000 RBX: ffff951e42afc000 RCX: 00000000ffffdfff
[  356.465622] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  356.466003] RBP: ffff951e42afc610 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  356.466374] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e42afc000
[  356.466745] R13: ffffa6170005be08 R14: ffff951e42afcb80 R15: ffff951e438f4550
[  356.467125] FS:  0000000000000000(0000) GS:ffff951e7ed00000(0000) knlGS:0000000000000000
[  356.467539] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  356.467846] CR2: 00007f7ab9eaa000 CR3: 0000000007860006 CR4: 0000000000770ef0
[  356.468215] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  356.468583] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  356.468956] PKRU: 55555554
[  356.469105] Call Trace:
[  356.469240]  <TASK>
[  356.469360] ? __warn (kernel/panic.c:677) 
[  356.469537] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[  356.469780] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  356.469989] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  356.470178] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  356.470384] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  356.470611] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[  356.470863] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[  356.471115] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) 
[  356.471316] br_dev_delete (net/bridge/br_if.c:396) 
[  356.471511] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  356.471747] cleanup_net (net/core/net_namespace.c:630) 
[  356.471953] ? process_one_work (kernel/workqueue.c:2606) 
[  356.472175] process_one_work (kernel/workqueue.c:2633) 
[  356.472392] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  356.472595] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  356.472826] kthread (kernel/kthread.c:388) 
[  356.473004] ? __pfx_kthread (kernel/kthread.c:341) 
[  356.473206] ret_from_fork (arch/x86/kernel/process.c:147) 
[  356.473401] ? __pfx_kthread (kernel/kthread.c:341) 
[  356.473601] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  356.476223] ------------[ cut here ]------------
| [  356.476681] sysfs group 'bridge' not found for kobject 'br0'
| [  356.477372] WARNING: CPU: 1 PID: 10 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  356.477995] Modules linked in: act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  356.480133] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  356.481831] Workqueue: netns cleanup_net
[  356.482409] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 356.482868] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 d0 cd d2 8c e8 ac 67 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
All code
========
   0:	48 89 ef             	mov    %rbp,%rdi
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	e9 7a ad ff ff       	jmp    0xffffffffffffad85
   b:	48 89 ef             	mov    %rbp,%rdi
   e:	e8 12 9b ff ff       	call   0xffffffffffff9b25
  13:	eb d1                	jmp    0xffffffffffffffe6
  15:	90                   	nop
  16:	49 8b 14 24          	mov    (%r12),%rdx
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 d0 cd d2 8c 	mov    $0xffffffff8cd2cdd0,%rdi
  24:	e8 ac 67 c5 ff       	call   0xffffffffffc567d5
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	5b                   	pop    %rbx
   5:	5d                   	pop    %rbp
   6:	41 5c                	pop    %r12
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	66                   	data16
   e:	66                   	data16
   f:	2e                   	cs
  10:	0f                   	.byte 0xf
  11:	1f                   	(bad)
  12:	84 00                	test   %al,(%rax)
	...
[  356.485790] RSP: 0018:ffffa6170005bd70 EFLAGS: 00010286
[  356.486759] RAX: 0000000000000000 RBX: ffffffff8c9472c0 RCX: 00000000ffffdfff
[  356.488094] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  356.489422] RBP: 0000000000000000 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  356.490656] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e42afc610
[  356.491263] R13: ffffa6170005be08 R14: ffff951e42afcb80 R15: ffff951e438f4550
[  356.491848] FS:  0000000000000000(0000) GS:ffff951e7ec80000(0000) knlGS:0000000000000000
[  356.492578] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  356.493264] CR2: 00005640657e1dec CR3: 0000000007860001 CR4: 0000000000770ef0
[  356.494143] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  356.495309] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  356.496303] PKRU: 55555554
[  356.496583] Call Trace:
[  356.496854]  <TASK>
[  356.497100] ? __warn (kernel/panic.c:677) 
[  356.497416] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  356.497837] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  356.498253] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  356.498651] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  356.499084] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  356.499510] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  356.499959] br_dev_delete (net/bridge/br_if.c:396) 
[  356.500380] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  356.500809] cleanup_net (net/core/net_namespace.c:630) 
[  356.501336] ? process_one_work (kernel/workqueue.c:2606) 
[  356.501761] process_one_work (kernel/workqueue.c:2633) 
[  356.502164] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  356.502512] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  356.503001] kthread (kernel/kthread.c:388) 
[  356.503373] ? __pfx_kthread (kernel/kthread.c:341) 
[  356.503728] ret_from_fork (arch/x86/kernel/process.c:147) 
[  356.504130] ? __pfx_kthread (kernel/kthread.c:341) 
[  356.504434] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  356.619059] ------------[ cut here ]------------
| [  356.619841] sysfs group 'bridge' not found for kobject 'br0'
| [  356.620593] WARNING: CPU: 2 PID: 10 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  356.621658] Modules linked in: act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  356.624919] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  356.626351] Workqueue: netns cleanup_net
[  356.626776] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 356.627258] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 d0 cd d2 8c e8 ac 67 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
All code
========
   0:	48 89 ef             	mov    %rbp,%rdi
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	e9 7a ad ff ff       	jmp    0xffffffffffffad85
   b:	48 89 ef             	mov    %rbp,%rdi
   e:	e8 12 9b ff ff       	call   0xffffffffffff9b25
  13:	eb d1                	jmp    0xffffffffffffffe6
  15:	90                   	nop
  16:	49 8b 14 24          	mov    (%r12),%rdx
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 d0 cd d2 8c 	mov    $0xffffffff8cd2cdd0,%rdi
  24:	e8 ac 67 c5 ff       	call   0xffffffffffc567d5
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	5b                   	pop    %rbx
   5:	5d                   	pop    %rbp
   6:	41 5c                	pop    %r12
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	66                   	data16
   e:	66                   	data16
   f:	2e                   	cs
  10:	0f                   	.byte 0xf
  11:	1f                   	(bad)
  12:	84 00                	test   %al,(%rax)
	...
[  356.628800] RSP: 0018:ffffa6170005bd70 EFLAGS: 00010286
[  356.629123] RAX: 0000000000000000 RBX: ffffffff8c9472c0 RCX: 00000000ffffdfff
[  356.629629] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  356.630004] RBP: 0000000000000000 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  356.630371] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e42a74610
[  356.630741] R13: ffffa6170005be08 R14: ffff951e42a74b80 R15: ffff951e43882e50
[  356.631131] FS:  0000000000000000(0000) GS:ffff951e7ed00000(0000) knlGS:0000000000000000
[  356.631543] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  356.631856] CR2: 00007f6b02e3c000 CR3: 0000000007860002 CR4: 0000000000770ef0
[  356.632225] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  356.632592] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  356.632965] PKRU: 55555554
[  356.633111] Call Trace:
[  356.633246]  <TASK>
[  356.633367] ? __warn (kernel/panic.c:677) 
[  356.633544] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  356.633765] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  356.633971] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  356.634162] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  356.634369] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  356.634595] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  356.634828] br_dev_delete (net/bridge/br_if.c:396) 
[  356.635026] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  356.635261] cleanup_net (net/core/net_namespace.c:630) 
[  356.635457] ? process_one_work (kernel/workqueue.c:2606) 
[  356.635681] process_one_work (kernel/workqueue.c:2633) 
[  356.635908] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  356.636112] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  356.636341] kthread (kernel/kthread.c:388) 
[  356.636516] ? __pfx_kthread (kernel/kthread.c:341) 
[  356.636719] ret_from_fork (arch/x86/kernel/process.c:147) 
[  356.636923] ? __pfx_kthread (kernel/kthread.c:341) 
[  356.637123] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  366.683201] ------------[ cut here ]------------
| [  366.683682] sysfs group 'bridge' not found for kobject 'br0'
| [  366.684327] WARNING: CPU: 3 PID: 10 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  366.685143] Modules linked in: act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  366.688130] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  366.689382] Workqueue: netns cleanup_net
[  366.689932] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 366.690577] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 d0 cd d2 8c e8 ac 67 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
All code
========
   0:	48 89 ef             	mov    %rbp,%rdi
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	e9 7a ad ff ff       	jmp    0xffffffffffffad85
   b:	48 89 ef             	mov    %rbp,%rdi
   e:	e8 12 9b ff ff       	call   0xffffffffffff9b25
  13:	eb d1                	jmp    0xffffffffffffffe6
  15:	90                   	nop
  16:	49 8b 14 24          	mov    (%r12),%rdx
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 d0 cd d2 8c 	mov    $0xffffffff8cd2cdd0,%rdi
  24:	e8 ac 67 c5 ff       	call   0xffffffffffc567d5
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	5b                   	pop    %rbx
   5:	5d                   	pop    %rbp
   6:	41 5c                	pop    %r12
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	66                   	data16
   e:	66                   	data16
   f:	2e                   	cs
  10:	0f                   	.byte 0xf
  11:	1f                   	(bad)
  12:	84 00                	test   %al,(%rax)
	...
[  366.692906] RSP: 0000:ffffa6170005bd70 EFLAGS: 00010286
[  366.693542] RAX: 0000000000000000 RBX: ffffffff8c9472c0 RCX: 00000000ffffdfff
[  366.694473] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  366.695090] RBP: 0000000000000000 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  366.695716] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e42afe610
[  366.696445] R13: ffffa6170005be08 R14: ffff951e42afeb80 R15: ffff951e438f5c50
[  366.697014] FS:  0000000000000000(0000) GS:ffff951e7ed80000(0000) knlGS:0000000000000000
[  366.697949] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  366.698461] CR2: 000056406611a558 CR3: 0000000007860004 CR4: 0000000000770ef0
[  366.699396] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  366.700415] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  366.701461] PKRU: 55555554
[  366.701874] Call Trace:
[  366.702241]  <TASK>
[  366.702549] ? __warn (kernel/panic.c:677) 
[  366.703013] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  366.703596] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  366.704189] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  366.704673] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  366.705275] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  366.705779] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  366.706303] br_dev_delete (net/bridge/br_if.c:396) 
[  366.706767] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  366.707352] cleanup_net (net/core/net_namespace.c:630) 
[  366.707877] ? process_one_work (kernel/workqueue.c:2606) 
[  366.708347] process_one_work (kernel/workqueue.c:2633) 
[  366.708924] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  366.709398] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  366.709740] kthread (kernel/kthread.c:388) 
[  366.710039] ? __pfx_kthread (kernel/kthread.c:341) 
[  366.710379] ret_from_fork (arch/x86/kernel/process.c:147) 
[  366.710875] ? __pfx_kthread (kernel/kthread.c:341) 
[  366.711187] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  366.819036] ------------[ cut here ]------------
| [  366.819507] sysfs group 'bridge' not found for kobject 'br0'
| [  366.820236] WARNING: CPU: 2 PID: 10 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  366.821254] Modules linked in: act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  366.824456] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  366.825619] Workqueue: netns cleanup_net
[  366.826060] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 366.826642] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 d0 cd d2 8c e8 ac 67 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
All code
========
   0:	48 89 ef             	mov    %rbp,%rdi
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	e9 7a ad ff ff       	jmp    0xffffffffffffad85
   b:	48 89 ef             	mov    %rbp,%rdi
   e:	e8 12 9b ff ff       	call   0xffffffffffff9b25
  13:	eb d1                	jmp    0xffffffffffffffe6
  15:	90                   	nop
  16:	49 8b 14 24          	mov    (%r12),%rdx
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 d0 cd d2 8c 	mov    $0xffffffff8cd2cdd0,%rdi
  24:	e8 ac 67 c5 ff       	call   0xffffffffffc567d5
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	5b                   	pop    %rbx
   5:	5d                   	pop    %rbp
   6:	41 5c                	pop    %r12
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	66                   	data16
   e:	66                   	data16
   f:	2e                   	cs
  10:	0f                   	.byte 0xf
  11:	1f                   	(bad)
  12:	84 00                	test   %al,(%rax)
	...
[  366.828550] RSP: 0018:ffffa6170005bd70 EFLAGS: 00010286
[  366.829107] RAX: 0000000000000000 RBX: ffffffff8c9472c0 RCX: 00000000ffffdfff
[  366.829761] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  366.830224] RBP: 0000000000000000 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  366.830742] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e42af8610
[  366.831292] R13: ffffa6170005be08 R14: ffff951e42af8b80 R15: ffff951e438f4550
[  366.832074] FS:  0000000000000000(0000) GS:ffff951e7ed00000(0000) knlGS:0000000000000000
[  366.832497] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  366.832797] CR2: 00007ffc5f5c4d58 CR3: 00000000023b2005 CR4: 0000000000770ef0
[  366.833446] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  366.834124] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  366.834723] PKRU: 55555554
[  366.834962] Call Trace:
[  366.835211]  <TASK>
[  366.835412] ? __warn (kernel/panic.c:677) 
[  366.835849] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  366.836355] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  366.836751] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  366.837175] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  366.837769] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  366.838275] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  366.838730] br_dev_delete (net/bridge/br_if.c:396) 
[  366.839179] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  366.839657] cleanup_net (net/core/net_namespace.c:630) 
[  366.840129] ? process_one_work (kernel/workqueue.c:2606) 
[  366.840591] process_one_work (kernel/workqueue.c:2633) 
[  366.841108] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  366.841596] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  366.842084] kthread (kernel/kthread.c:388) 
[  366.842483] ? __pfx_kthread (kernel/kthread.c:341) 
[  366.842907] ret_from_fork (arch/x86/kernel/process.c:147) 
[  366.843276] ? __pfx_kthread (kernel/kthread.c:341) 
[  366.843732] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  375.860151] ------------[ cut here ]------------
| [  375.860788] sysfs group 'bridge' not found for kobject 'br0'
| [  375.861564] WARNING: CPU: 2 PID: 10 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  375.862273] Modules linked in: cls_matchall act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  375.865449] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  375.866131] Workqueue: netns cleanup_net
[  375.866371] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 375.866642] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 d0 cd d2 8c e8 ac 67 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
All code
========
   0:	48 89 ef             	mov    %rbp,%rdi
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	e9 7a ad ff ff       	jmp    0xffffffffffffad85
   b:	48 89 ef             	mov    %rbp,%rdi
   e:	e8 12 9b ff ff       	call   0xffffffffffff9b25
  13:	eb d1                	jmp    0xffffffffffffffe6
  15:	90                   	nop
  16:	49 8b 14 24          	mov    (%r12),%rdx
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 d0 cd d2 8c 	mov    $0xffffffff8cd2cdd0,%rdi
  24:	e8 ac 67 c5 ff       	call   0xffffffffffc567d5
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	5b                   	pop    %rbx
   5:	5d                   	pop    %rbp
   6:	41 5c                	pop    %r12
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	66                   	data16
   e:	66                   	data16
   f:	2e                   	cs
  10:	0f                   	.byte 0xf
  11:	1f                   	(bad)
  12:	84 00                	test   %al,(%rax)
	...
[  375.868082] RSP: 0018:ffffa6170005bd70 EFLAGS: 00010286
[  375.868492] RAX: 0000000000000000 RBX: ffffffff8c9472c0 RCX: 00000000ffffdfff
[  375.869220] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  375.870041] RBP: 0000000000000000 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  375.870950] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e421c2610
[  375.871682] R13: ffffa6170005be08 R14: ffff951e421c2b80 R15: ffff951e438f0050
[  375.872386] FS:  0000000000000000(0000) GS:ffff951e7ed00000(0000) knlGS:0000000000000000
[  375.873397] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  375.873981] CR2: 00007fc6ee352270 CR3: 0000000007860005 CR4: 0000000000770ef0
[  375.874704] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  375.875426] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  375.876138] PKRU: 55555554
[  375.876440] Call Trace:
[  375.876712]  <TASK>
[  375.876958] ? __warn (kernel/panic.c:677) 
[  375.877301] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  375.877729] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  375.878110] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  375.878443] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  375.878827] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  375.879267] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  375.879678] br_dev_delete (net/bridge/br_if.c:396) 
[  375.880069] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  375.880706] cleanup_net (net/core/net_namespace.c:630) 
[  375.881124] ? process_one_work (kernel/workqueue.c:2606) 
[  375.881703] process_one_work (kernel/workqueue.c:2633) 
[  375.882269] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  375.882668] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  375.883252] kthread (kernel/kthread.c:388) 
[  375.883581] ? __pfx_kthread (kernel/kthread.c:341) 
[  375.883891] ret_from_fork (arch/x86/kernel/process.c:147) 
[  375.884225] ? __pfx_kthread (kernel/kthread.c:341) 
[  375.884581] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  375.992042] ------------[ cut here ]------------
| [  375.992343] sysfs group 'bridge' not found for kobject 'br0'
| [  375.992703] WARNING: CPU: 1 PID: 10 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  375.993201] Modules linked in: cls_matchall act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  375.994828] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  375.995487] Workqueue: netns cleanup_net
[  375.995731] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 375.996038] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 d0 cd d2 8c e8 ac 67 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
All code
========
   0:	48 89 ef             	mov    %rbp,%rdi
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	e9 7a ad ff ff       	jmp    0xffffffffffffad85
   b:	48 89 ef             	mov    %rbp,%rdi
   e:	e8 12 9b ff ff       	call   0xffffffffffff9b25
  13:	eb d1                	jmp    0xffffffffffffffe6
  15:	90                   	nop
  16:	49 8b 14 24          	mov    (%r12),%rdx
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 d0 cd d2 8c 	mov    $0xffffffff8cd2cdd0,%rdi
  24:	e8 ac 67 c5 ff       	call   0xffffffffffc567d5
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	5b                   	pop    %rbx
   5:	5d                   	pop    %rbp
   6:	41 5c                	pop    %r12
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	66                   	data16
   e:	66                   	data16
   f:	2e                   	cs
  10:	0f                   	.byte 0xf
  11:	1f                   	(bad)
  12:	84 00                	test   %al,(%rax)
	...
[  375.997115] RSP: 0018:ffffa6170005bd70 EFLAGS: 00010286
[  375.997438] RAX: 0000000000000000 RBX: ffffffff8c9472c0 RCX: 00000000ffffdfff
[  375.997859] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  375.998260] RBP: 0000000000000000 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  375.998686] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e421c0610
[  375.999110] R13: ffffa6170005be08 R14: ffff951e421c0b80 R15: ffff951e41c44550
[  375.999511] FS:  0000000000000000(0000) GS:ffff951e7ec80000(0000) knlGS:0000000000000000
[  375.999962] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  376.000279] CR2: 000055f202365a70 CR3: 0000000002572003 CR4: 0000000000770ef0
[  376.000652] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  376.001046] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  376.001413] PKRU: 55555554
[  376.001560] Call Trace:
[  376.001705]  <TASK>
[  376.001832] ? __warn (kernel/panic.c:677) 
[  376.002011] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  376.002233] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  376.002431] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  376.002619] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  376.002909] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  376.003259] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  376.003596] br_dev_delete (net/bridge/br_if.c:396) 
[  376.003903] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  376.004258] cleanup_net (net/core/net_namespace.c:630) 
[  376.004555] ? process_one_work (kernel/workqueue.c:2606) 
[  376.004898] process_one_work (kernel/workqueue.c:2633) 
[  376.005228] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  376.005499] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  376.005737] kthread (kernel/kthread.c:388) 
[  376.005917] ? __pfx_kthread (kernel/kthread.c:341) 
[  376.006118] ret_from_fork (arch/x86/kernel/process.c:147) 
[  376.006312] ? __pfx_kthread (kernel/kthread.c:341) 
[  376.006510] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  388.308138] ------------[ cut here ]------------
| [  388.308925] sysfs group 'bridge' not found for kobject 'br0'
| [  388.309413] WARNING: CPU: 1 PID: 10 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  388.310268] Modules linked in: cls_matchall act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  388.313257] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  388.314885] Workqueue: netns cleanup_net
[  388.315556] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 388.316382] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 d0 cd d2 8c e8 ac 67 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
All code
========
   0:	48 89 ef             	mov    %rbp,%rdi
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	e9 7a ad ff ff       	jmp    0xffffffffffffad85
   b:	48 89 ef             	mov    %rbp,%rdi
   e:	e8 12 9b ff ff       	call   0xffffffffffff9b25
  13:	eb d1                	jmp    0xffffffffffffffe6
  15:	90                   	nop
  16:	49 8b 14 24          	mov    (%r12),%rdx
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 d0 cd d2 8c 	mov    $0xffffffff8cd2cdd0,%rdi
  24:	e8 ac 67 c5 ff       	call   0xffffffffffc567d5
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	5b                   	pop    %rbx
   5:	5d                   	pop    %rbp
   6:	41 5c                	pop    %r12
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	66                   	data16
   e:	66                   	data16
   f:	2e                   	cs
  10:	0f                   	.byte 0xf
  11:	1f                   	(bad)
  12:	84 00                	test   %al,(%rax)
	...
[  388.319227] RSP: 0018:ffffa6170005bd70 EFLAGS: 00010286
[  388.320144] RAX: 0000000000000000 RBX: ffffffff8c9472c0 RCX: 00000000ffffdfff
[  388.321308] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  388.322515] RBP: 0000000000000000 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  388.323474] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e4254c610
[  388.324547] R13: ffffa6170005be08 R14: ffff951e4254cb80 R15: ffff951e43882e50
[  388.325617] FS:  0000000000000000(0000) GS:ffff951e7ec80000(0000) knlGS:0000000000000000
[  388.326872] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  388.327722] CR2: 00007f73171390e0 CR3: 0000000003916002 CR4: 0000000000770ef0
[  388.328386] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  388.329047] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  388.329597] PKRU: 55555554
[  388.329829] Call Trace:
[  388.330035]  <TASK>
[  388.330216] ? __warn (kernel/panic.c:677) 
[  388.330483] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  388.330815] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  388.331297] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  388.331583] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  388.331902] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  388.332249] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  388.332584] br_dev_delete (net/bridge/br_if.c:396) 
[  388.332885] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  388.333235] cleanup_net (net/core/net_namespace.c:630) 
[  388.333531] ? process_one_work (kernel/workqueue.c:2606) 
[  388.333870] process_one_work (kernel/workqueue.c:2633) 
[  388.334190] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  388.334491] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  388.334839] kthread (kernel/kthread.c:388) 
[  388.335092] ? __pfx_kthread (kernel/kthread.c:341) 
[  388.335390] ret_from_fork (arch/x86/kernel/process.c:147) 
[  388.335674] ? __pfx_kthread (kernel/kthread.c:341) 
[  388.335985] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  388.446156] ------------[ cut here ]------------
| [  388.446563] sysfs group 'bridge' not found for kobject 'br0'
| [  388.447057] WARNING: CPU: 2 PID: 10 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  388.447606] Modules linked in: cls_matchall act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  388.449199] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  388.449931] Workqueue: netns cleanup_net
[  388.450200] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 388.450512] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 d0 cd d2 8c e8 ac 67 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
All code
========
   0:	48 89 ef             	mov    %rbp,%rdi
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	e9 7a ad ff ff       	jmp    0xffffffffffffad85
   b:	48 89 ef             	mov    %rbp,%rdi
   e:	e8 12 9b ff ff       	call   0xffffffffffff9b25
  13:	eb d1                	jmp    0xffffffffffffffe6
  15:	90                   	nop
  16:	49 8b 14 24          	mov    (%r12),%rdx
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 d0 cd d2 8c 	mov    $0xffffffff8cd2cdd0,%rdi
  24:	e8 ac 67 c5 ff       	call   0xffffffffffc567d5
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	5b                   	pop    %rbx
   5:	5d                   	pop    %rbp
   6:	41 5c                	pop    %r12
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	66                   	data16
   e:	66                   	data16
   f:	2e                   	cs
  10:	0f                   	.byte 0xf
  11:	1f                   	(bad)
  12:	84 00                	test   %al,(%rax)
	...
[  388.451661] RSP: 0018:ffffa6170005bd70 EFLAGS: 00010286
[  388.452059] RAX: 0000000000000000 RBX: ffffffff8c9472c0 RCX: 00000000ffffdfff
[  388.452461] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  388.452911] RBP: 0000000000000000 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  388.453439] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e4254e610
[  388.453973] R13: ffffa6170005be08 R14: ffff951e4254eb80 R15: ffff951e41c44550
[  388.454522] FS:  0000000000000000(0000) GS:ffff951e7ed00000(0000) knlGS:0000000000000000
[  388.455037] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  388.455378] CR2: 00005640657e1dec CR3: 00000000023b2003 CR4: 0000000000770ef0
[  388.455788] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  388.456213] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  388.456599] PKRU: 55555554
[  388.456765] Call Trace:
[  388.456920]  <TASK>
[  388.457042] ? __warn (kernel/panic.c:677) 
[  388.457248] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  388.457489] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  388.457706] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  388.457918] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  388.458149] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  388.458394] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  388.458638] br_dev_delete (net/bridge/br_if.c:396) 
[  388.458850] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  388.459128] cleanup_net (net/core/net_namespace.c:630) 
[  388.459369] ? process_one_work (kernel/workqueue.c:2606) 
[  388.459659] process_one_work (kernel/workqueue.c:2633) 
[  388.459962] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  388.460248] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  388.460510] kthread (kernel/kthread.c:388) 
[  388.460682] ? __pfx_kthread (kernel/kthread.c:341) 
[  388.460978] ret_from_fork (arch/x86/kernel/process.c:147) 
[  388.461196] ? __pfx_kthread (kernel/kthread.c:341) 
[  388.461404] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [  424.586204] ------------[ cut here ]------------
| [  424.586536] sysfs group 'bridge' not found for kobject 'br0'
| [  424.586929] WARNING: CPU: 0 PID: 10 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  424.587408] Modules linked in: cls_matchall act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  424.589117] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  424.589742] Workqueue: netns cleanup_net
[  424.590080] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 424.590458] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 d0 cd d2 8c e8 ac 67 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
All code
========
   0:	48 89 ef             	mov    %rbp,%rdi
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	e9 7a ad ff ff       	jmp    0xffffffffffffad85
   b:	48 89 ef             	mov    %rbp,%rdi
   e:	e8 12 9b ff ff       	call   0xffffffffffff9b25
  13:	eb d1                	jmp    0xffffffffffffffe6
  15:	90                   	nop
  16:	49 8b 14 24          	mov    (%r12),%rdx
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 d0 cd d2 8c 	mov    $0xffffffff8cd2cdd0,%rdi
  24:	e8 ac 67 c5 ff       	call   0xffffffffffc567d5
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	5b                   	pop    %rbx
   5:	5d                   	pop    %rbp
   6:	41 5c                	pop    %r12
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	66                   	data16
   e:	66                   	data16
   f:	2e                   	cs
  10:	0f                   	.byte 0xf
  11:	1f                   	(bad)
  12:	84 00                	test   %al,(%rax)
	...
[  424.591501] RSP: 0018:ffffa6170005bd70 EFLAGS: 00010286
[  424.591935] RAX: 0000000000000000 RBX: ffffffff8c9472c0 RCX: 00000000ffffdfff
[  424.592362] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  424.592833] RBP: 0000000000000000 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  424.593297] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e42a70610
[  424.593690] R13: ffffa6170005be08 R14: ffff951e42a70b80 R15: ffff951e42a7c550
[  424.594157] FS:  0000000000000000(0000) GS:ffff951e7ec00000(0000) knlGS:0000000000000000
[  424.594623] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  424.595036] CR2: 00007fcf8a7db270 CR3: 0000000007860002 CR4: 0000000000770ef0
[  424.595441] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  424.595870] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  424.596391] PKRU: 55555554
[  424.596633] Call Trace:
[  424.596843]  <TASK>
[  424.597050] ? __warn (kernel/panic.c:677) 
[  424.597315] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  424.597623] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  424.597947] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  424.598264] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  424.598511] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  424.598769] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  424.599072] br_dev_delete (net/bridge/br_if.c:396) 
[  424.599312] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  424.599589] cleanup_net (net/core/net_namespace.c:630) 
[  424.599866] ? process_one_work (kernel/workqueue.c:2606) 
[  424.600162] process_one_work (kernel/workqueue.c:2633) 
[  424.600414] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  424.600693] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  424.601118] kthread (kernel/kthread.c:388) 
[  424.601339] ? __pfx_kthread (kernel/kthread.c:341) 
[  424.601583] ret_from_fork (arch/x86/kernel/process.c:147) 
[  424.601891] ? __pfx_kthread (kernel/kthread.c:341) 
[  424.602194] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| xx__-> [  424.744098] ------------[ cut here ]------------
| [  424.744440] sysfs group 'bridge' not found for kobject 'br0'
| [  424.744778] WARNING: CPU: 1 PID: 10 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [  424.745257] Modules linked in: cls_matchall act_gact cls_flower vxlan ip6_udp_tunnel udp_tunnel xt_mark sch_ingress act_mirred cls_basic sch_fq_codel sha1_generic xfrm_user xt_policy nft_compat nf_tables libcrc32c
[  424.746826] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  424.747510] Workqueue: netns cleanup_net
[  424.747723] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 424.748019] Code: 48 89 ef 5d 41 5c e9 7a ad ff ff 48 89 ef e8 12 9b ff ff eb d1 90 49 8b 14 24 48 8b 33 48 c7 c7 d0 cd d2 8c e8 ac 67 c5 ff 90 <0f> 0b 90 90 5b 5d 41 5c c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00
All code
========
   0:	48 89 ef             	mov    %rbp,%rdi
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	e9 7a ad ff ff       	jmp    0xffffffffffffad85
   b:	48 89 ef             	mov    %rbp,%rdi
   e:	e8 12 9b ff ff       	call   0xffffffffffff9b25
  13:	eb d1                	jmp    0xffffffffffffffe6
  15:	90                   	nop
  16:	49 8b 14 24          	mov    (%r12),%rdx
  1a:	48 8b 33             	mov    (%rbx),%rsi
  1d:	48 c7 c7 d0 cd d2 8c 	mov    $0xffffffff8cd2cdd0,%rdi
  24:	e8 ac 67 c5 ff       	call   0xffffffffffc567d5
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	5b                   	pop    %rbx
  2f:	5d                   	pop    %rbp
  30:	41 5c                	pop    %r12
  32:	c3                   	ret
  33:	cc                   	int3
  34:	cc                   	int3
  35:	cc                   	int3
  36:	cc                   	int3
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	5b                   	pop    %rbx
   5:	5d                   	pop    %rbp
   6:	41 5c                	pop    %r12
   8:	c3                   	ret
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	cc                   	int3
   d:	66                   	data16
   e:	66                   	data16
   f:	2e                   	cs
  10:	0f                   	.byte 0xf
  11:	1f                   	(bad)
  12:	84 00                	test   %al,(%rax)
	...
[  424.749077] RSP: 0018:ffffa6170005bd70 EFLAGS: 00010286
[  424.749351] RAX: 0000000000000000 RBX: ffffffff8c9472c0 RCX: 00000000ffffdfff
[  424.749829] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[  424.750200] RBP: 0000000000000000 R08: ffffffff8d178508 R09: 00000000ffffdfff
[  424.750565] R10: ffffffff8d098520 R11: ffffffff8d148520 R12: ffff951e41906610
[  424.751035] R13: ffffa6170005be08 R14: ffff951e41906b80 R15: ffff951e41c44550
[  424.751433] FS:  0000000000000000(0000) GS:ffff951e7ec80000(0000) knlGS:0000000000000000
[  424.751877] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  424.752277] CR2: 00007fa41b6cb0e0 CR3: 0000000007860005 CR4: 0000000000770ef0
[  424.752689] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  424.753076] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  424.753453] PKRU: 55555554
[  424.753671] Call Trace:
[  424.753839]  <TASK>
[  424.753960] ? __warn (kernel/panic.c:677) 
[  424.754140] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  424.754367] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[  424.754573] ? handle_bug (arch/x86/kernel/traps.c:238) 
[  424.754774] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[  424.755079] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[  424.755307] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[  424.755532] br_dev_delete (net/bridge/br_if.c:396) 
[  424.755729] br_net_exit_batch_rtnl (net/bridge/br.c:369) 
[  424.755992] cleanup_net (net/core/net_namespace.c:630) 
[  424.756244] ? process_one_work (kernel/workqueue.c:2606) 
[  424.756543] process_one_work (kernel/workqueue.c:2633) 
[  424.756766] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[  424.756985] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[  424.757218] kthread (kernel/kthread.c:388) 
[  424.757389] ? __pfx_kthread (kernel/kthread.c:341) 

[  424.757808] ret_from_fork (arch/x86/kernel/process.c:147) 
[  424.758016] ? __pfx_kthread (kernel/kthread.c:341) 
xx__-> [  424.758219] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 


Finger prints:
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