======================================
| [   82.296217][   T70] ==================================================================
| [ 82.296753][ T70] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:729) 
| [   82.297177][   T70] Read of size 1 at addr ffff888001fbaf7c by task kworker/u8:1/70
| [   82.297645][   T70]
[   82.298271][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   82.299049][   T70] Workqueue: netns cleanup_net
[   82.299396][   T70] Call Trace:
[   82.299592][   T70]  <TASK>
[ 82.299749][ T70] dump_stack_lvl (lib/dump_stack.c:107) 
[ 82.300016][ T70] print_address_description.constprop.0 (mm/kasan/report.c:378) 
[ 82.300437][ T70] ? kobject_put (lib/kobject.c:729) 
[ 82.300712][ T70] print_report (mm/kasan/report.c:489) 
[ 82.300990][ 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) 
[ 82.301314][ T70] kasan_report (mm/kasan/report.c:603) 
[ 82.301575][ T70] ? kobject_put (lib/kobject.c:729) 
[ 82.301942][ T70] kobject_put (lib/kobject.c:729) 
[ 82.302284][ T70] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge
[ 82.302663][ T70] br_dev_delete (net/bridge/br_if.c:396) bridge
[ 82.303035][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge
[ 82.303412][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 82.303648][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 82.303960][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 82.304258][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 82.304543][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 82.304852][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 82.305151][ 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) 
[ 82.305431][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 82.305835][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 82.306084][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 82.306390][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 82.306805][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 82.307112][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 82.307381][ T70] kthread (kernel/kthread.c:388) 
[ 82.307638][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 82.307904][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 82.308166][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 82.308525][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   82.329984][   T70] ------------[ cut here ]------------
| [   82.330297][   T70] refcount_t: underflow; use-after-free.
| [ 82.330663][ T70] WARNING: CPU: 3 PID: 70 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
| [   82.331300][   T70] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel bridge stp llc act_gact cls_flower sch_ingress ip6_gre ip6_tunnel tunnel6 gre 8021q dummy vrf veth
[   82.332869][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   82.333510][   T70] Workqueue: netns cleanup_net
[ 82.333768][ T70] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 82.334106][ T70] Code: 64 5d 03 80 fb 01 0f 87 54 5a 91 01 83 e3 01 0f 85 4d ff ff ff c6 05 d6 64 5d 03 01 90 48 c7 c7 00 58 e2 8c e8 5e 4c 2b ff 90 <0f> 0b 90 90 e9 2f ff ff ff 48 89 df e8 7c 23 a7 ff e9 b6 fe ff ff
All code
========
   0:	64 5d                	fs pop %rbp
   2:	03 80 fb 01 0f 87    	add    -0x78f0fe05(%rax),%eax
   8:	54                   	push   %rsp
   9:	5a                   	pop    %rdx
   a:	91                   	xchg   %eax,%ecx
   b:	01 83 e3 01 0f 85    	add    %eax,-0x7af0fe1d(%rbx)
  11:	4d ff                	rex.WRB (bad)
  13:	ff                   	(bad)
  14:	ff c6                	inc    %esi
  16:	05 d6 64 5d 03       	add    $0x35d64d6,%eax
  1b:	01 90 48 c7 c7 00    	add    %edx,0xc7c748(%rax)
  21:	58                   	pop    %rax
  22:	e2 8c                	loop   0xffffffffffffffb0
  24:	e8 5e 4c 2b ff       	call   0xffffffffff2b4c87
  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 7c 23 a7 ff       	call   0xffffffffffa723b7
  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 7c 23 a7 ff       	call   0xffffffffffa7238d
  11:	e9 b6 fe ff ff       	jmp    0xfffffffffffffecc
[   82.335150][   T70] RSP: 0018:ffffc9000050fb98 EFLAGS: 00010282
[   82.335469][   T70] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8a30e74f
[   82.335885][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   82.336486][   T70] RBP: 0000000000000003 R08: 0000000000000000 R09: fffff520000a1f18
[   82.336933][   T70] R10: ffffc9000050f8c7 R11: 205d303754202020 R12: ffff88800a08a000
[   82.337400][   T70] R13: ffff88800a08add8 R14: ffffc9000050fc98 R15: ffff88800a08aba0
[   82.337888][   T70] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[   82.338421][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   82.338817][   T70] CR2: 0000562aaa81a8a8 CR3: 000000000f71e006 CR4: 00000000001706f0
[   82.339243][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   82.339680][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   82.340165][   T70] Call Trace:
[   82.340371][   T70]  <TASK>
[ 82.340539][ T70] ? __warn (kernel/panic.c:677) 
[ 82.340796][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 82.341139][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 82.341399][ T70] ? vprintk_emit (kernel/printk/printk.c:2313) 
[ 82.341667][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 82.341940][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 82.342210][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 82.342511][ 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) 
[ 82.342768][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 82.343110][ T70] ? refcount_warn_saturate (lib/refcount.c:28 (discriminator 3)) 
[ 82.343428][ T70] br_sysfs_delbr (net/bridge/br_sysfs_br.c:1086) bridge
[ 82.343765][ T70] br_dev_delete (net/bridge/br_if.c:396) bridge
[ 82.344130][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge
[ 82.344542][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 82.344809][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 82.345137][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 82.345433][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 82.345684][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 82.345961][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 82.346299][ 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) 
[ 82.346590][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 82.346914][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 82.347167][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 82.347460][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 82.347872][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 82.348180][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 82.348492][ T70] kthread (kernel/kthread.c:388) 
[ 82.348743][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 82.349008][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 82.349244][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 82.349525][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   82.352992][   T70] ------------[ cut here ]------------
| [   82.353334][   T70] sysfs group 'bridge' not found for kobject 'br2'
| [ 82.353742][ T70] WARNING: CPU: 3 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   82.354442][   T70] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel bridge stp llc act_gact cls_flower sch_ingress ip6_gre ip6_tunnel tunnel6 gre 8021q dummy vrf veth
[   82.355977][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   82.356664][   T70] Workqueue: netns cleanup_net
[ 82.356974][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 82.357381][ 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 99 dc 8c e8 10 18 5f ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 69 ee 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 99 dc 8c 	mov    $0xffffffff8cdc99a0,%rdi
  24:	e8 10 18 5f ff       	call   0xffffffffff5f1839
  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 69 ee da ff       	call   0xffffffffffdaeea9

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 69 ee da ff       	call   0xffffffffffdaee7f
[   82.358662][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[   82.359077][   T70] RAX: 0000000000000000 RBX: ffffffffc0475f00 RCX: ffffffff8a30e74f
[   82.359532][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   82.360023][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[   82.360527][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff88800a08a610
[   82.361027][   T70] R13: ffff88800a08add8 R14: ffffc9000050fc98 R15: ffff88800a08aba0
[   82.361465][   T70] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[   82.361954][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   82.362328][   T70] CR2: 0000562aaa81a8a8 CR3: 000000000f71e006 CR4: 00000000001706f0
[   82.362774][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   82.363214][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   82.363653][   T70] Call Trace:
[   82.363852][   T70]  <TASK>
[ 82.364119][ T70] ? __warn (kernel/panic.c:677) 
[ 82.364379][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 82.364647][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 82.364938][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 82.365222][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 82.365466][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 82.365718][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 82.365995][ 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) 
[ 82.366254][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 82.366552][ T70] br_dev_delete (net/bridge/br_if.c:396) bridge
[ 82.366877][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge
[ 82.367241][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 82.367481][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 82.367777][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 82.368050][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 82.368300][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 82.368571][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 82.368837][ 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) 
[ 82.369084][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 82.369398][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 82.369644][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 82.369906][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 82.370299][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 82.370624][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 82.370933][ T70] kthread (kernel/kthread.c:388) 
[ 82.371197][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 82.371488][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 82.371737][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 82.372024][ T70] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [   82.568048][   T70] ------------[ cut here ]------------
| [   82.568384][   T70] sysfs group 'bridge' not found for kobject 'br2'
| [ 82.568807][ T70] WARNING: CPU: 3 PID: 70 at fs/sysfs/group.c:282 sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
| [   82.569390][   T70] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel bridge stp llc act_gact cls_flower sch_ingress ip6_gre ip6_tunnel tunnel6 gre 8021q dummy vrf veth
[   82.570934][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   82.571761][   T70] Workqueue: netns cleanup_net
[ 82.572040][ T70] RIP: 0010:sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 82.572397][ 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 99 dc 8c e8 10 18 5f ff 90 <0f> 0b 90 90 48 83 c4 08 5b 5d 41 5c c3 cc cc cc cc e8 69 ee 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 99 dc 8c 	mov    $0xffffffff8cdc99a0,%rdi
  24:	e8 10 18 5f ff       	call   0xffffffffff5f1839
  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 69 ee da ff       	call   0xffffffffffdaeea9

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 69 ee da ff       	call   0xffffffffffdaee7f
[   82.573641][   T70] RSP: 0018:ffffc9000050fba0 EFLAGS: 00010282
[   82.574100][   T70] RAX: 0000000000000000 RBX: ffffffffc0475f00 RCX: ffffffff8a30e74f
[   82.574562][   T70] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[   82.575088][   T70] RBP: 0000000000000000 R08: 0000000000000000 R09: fffff520000a1f19
[   82.575607][   T70] R10: ffffc9000050f8cf R11: 205d303754202020 R12: ffff888010d82610
[   82.576180][   T70] R13: ffff888010d82dd8 R14: ffffc9000050fc98 R15: ffff888010d82ba0
[   82.576683][   T70] FS:  0000000000000000(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[   82.577216][   T70] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   82.577621][   T70] CR2: 0000562aaa81a8a8 CR3: 000000000f71e006 CR4: 00000000001706f0
[   82.578075][   T70] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   82.578488][   T70] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   82.578903][   T70] Call Trace:
[   82.579083][   T70]  <TASK>
[ 82.579240][ T70] ? __warn (kernel/panic.c:677) 
[ 82.579461][ T70] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 82.579719][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 82.580000][ T70] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 82.580243][ T70] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 82.580473][ T70] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 82.580742][ T70] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 82.581044][ 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) 
[ 82.581319][ T70] ? sysfs_remove_group (fs/sysfs/group.c:282 (discriminator 1)) 
[ 82.581747][ T70] br_dev_delete (net/bridge/br_if.c:396) bridge
[ 82.582185][ T70] br_net_exit_batch_rtnl (net/bridge/br.c:369) bridge
[ 82.582551][ T70] cleanup_net (net/core/net_namespace.c:628 (discriminator 2)) 
[ 82.582837][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 82.583172][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 82.583483][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 82.583814][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 82.584217][ T70] process_one_work (kernel/workqueue.c:2638) 
[ 82.584557][ 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) 
[ 82.584845][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 82.585139][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 82.585424][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 82.585714][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 82.586133][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 82.586439][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 82.586782][ T70] kthread (kernel/kthread.c:388) 
[ 82.587114][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 82.587355][ T70] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 82.587632][ 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