======================================
| [  843.453998][ T5437] br0: port 1(eth0) entered forwarding state
| [  843.456284][ T5437] ------------[ cut here ]------------
| [ 843.456597][ T5437] WARNING: CPU: 3 PID: 5437 at ./include/net/netdev_lock.h:17 netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
| [  843.457867][ T5437] Modules linked in: act_gact cls_flower act_mirred cls_u32 sch_ingress ifb vxlan nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables
[  843.459525][ T5437] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 843.459923][ T5437] RIP: 0010:netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
[ 843.460245][ T5437] Code: 00 00 8b 05 97 05 bc 02 85 c0 0f 84 52 fe ff ff 48 8d bb c0 0c 00 00 be ff ff ff ff e8 fa fd 9b 00 85 c0 0f 85 39 fe ff ff 90 <0f> 0b 90 e9 30 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	8b 05 97 05 bc 02    	mov    0x2bc0597(%rip),%eax        # 0x2bc059f
   8:	85 c0                	test   %eax,%eax
   a:	0f 84 52 fe ff ff    	je     0xfffffffffffffe62
  10:	48 8d bb c0 0c 00 00 	lea    0xcc0(%rbx),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 fa fd 9b 00       	call   0x9bfe1b
  21:	85 c0                	test   %eax,%eax
  23:	0f 85 39 fe ff ff    	jne    0xfffffffffffffe62
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 30 fe ff ff       	jmp    0xfffffffffffffe62
  32:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  39:	fc ff df 
  3c:	4c 89 fa             	mov    %r15,%rdx
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 30 fe ff ff       	jmp    0xfffffffffffffe38
   8:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   f:	fc ff df 
  12:	4c 89 fa             	mov    %r15,%rdx
  15:	48                   	rex.W
[  843.461324][ T5437] RSP: 0018:ffffc900065eeef0 EFLAGS: 00010246
[  843.461712][ T5437] RAX: 0000000000000000 RBX: ffff88801130a000 RCX: 0000000000000001
[  843.462508][ T5437] RDX: 0000000000000000 RSI: ffffffff98d10759 RDI: ffffffff98458280
[  843.462988][ T5437] RBP: ffffc900065eefd8 R08: 0000000000000000 R09: 0000000000000000
[  843.463446][ T5437] R10: ffffc900065ef008 R11: ffffffff9978d1e0 R12: 1ffff92000cbdde2
[  843.463888][ T5437] R13: 00000000000005dc R14: ffffc900065ef008 R15: ffff88801130af48
[  843.464361][ T5437] FS:  00007f1488a3e800(0000) GS:ffff8880d1d19000(0000) knlGS:0000000000000000
[  843.464884][ T5437] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  843.465286][ T5437] CR2: 00000000004e59f0 CR3: 000000000c524003 CR4: 0000000000772ef0
[  843.465740][ T5437] PKRU: 55555554
[  843.465975][ T5437] Call Trace:
[  843.466200][ T5437]  <TASK>
[ 843.466358][ T5437] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 843.466660][ T5437] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 843.466986][ T5437] netif_set_mtu (net/core/dev.c:9652) 
[ 843.467300][ T5437] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 843.467612][ T5437] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 843.467837][ T5437] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 843.468163][ T5437] br_add_if (net/bridge/br_if.c:697) 
[ 843.468401][ T5437] do_set_master (net/core/rtnetlink.c:2948) 
[ 843.468697][ T5437] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 843.469010][ T5437] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[ 843.469316][ T5437] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[ 843.469693][ T5437] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 843.470002][ T5437] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 843.470296][ T5437] ? __kernel_text_address (kernel/extable.c:79) 
[ 843.470595][ T5437] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 843.470895][ T5437] ? __mutex_trylock_common (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4296 ./include/linux/atomic/atomic-long.h:1482 ./include/linux/atomic/atomic-instrumented.h:4458 kernel/locking/mutex.c:113) 
[ 843.471206][ T5437] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:88) 
[ 843.471582][ T5437] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 843.471884][ T5437] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 843.472197][ T5437] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[ 843.472500][ T5437] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[ 843.472820][ T5437] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 843.473126][ T5437] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[ 843.473417][ T5437] ? __create_object (mm/kmemleak.c:771) 
[ 843.473716][ T5437] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 843.474028][ T5437] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 843.474324][ T5437] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 843.474691][ T5437] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[ 843.475001][ T5437] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[ 843.475306][ T5437] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 843.475601][ T5437] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 843.475921][ T5437] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 843.476218][ T5437] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[ 843.476516][ T5437] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 843.476812][ T5437] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 843.477115][ T5437] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[ 843.477412][ T5437] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 843.477710][ T5437] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 843.478023][ T5437] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 843.478332][ T5437] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 843.478639][ T5437] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 843.478949][ T5437] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 843.479346][ T5437] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 843.479658][ T5437] netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1346) 
[ 843.479982][ T5437] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[ 843.480280][ T5437] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 843.480579][ T5437] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[ 843.480882][ T5437] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[ 843.481186][ T5437] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[ 843.481487][ T5437] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[ 843.481789][ T5437] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[ 843.482090][ T5437] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[ 843.482467][ T5437] ___sys_sendmsg (net/socket.c:2670) 
[ 843.482775][ T5437] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 843.483086][ T5437] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3096) 
[ 843.483457][ T5437] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[ 843.483755][ T5437] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 843.484071][ T5437] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 843.484379][ T5437] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 843.484675][ T5437] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[ 843.484978][ T5437] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 843.485287][ T5437] __sys_sendmsg (net/socket.c:2700) 
[ 843.485583][ T5437] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[ 843.485960][ T5437] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[ 843.486269][ T5437] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 843.486576][ T5437] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 843.486874][ T5437] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  843.487251][ T5437] RIP: 0033:0x7f1488c0b1e7
[ 843.487564][ T5437] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[  843.488651][ T5437] RSP: 002b:00007ffd891902a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  843.489111][ T5437] RAX: ffffffffffffffda RBX: 00007ffd891909d0 RCX: 00007f1488c0b1e7
[  843.489842][ T5437] RDX: 0000000000000000 RSI: 00007ffd89190310 RDI: 0000000000000005
[  843.490298][ T5437] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[  843.490746][ T5437] R10: 000000001f491910 R11: 0000000000000246 R12: 0000000000000004
[  843.491420][ T5437] R13: 00000000686e2329 R14: 0000000000499600 R15: 0000000000000000
| [  845.139848][ T5444] ------------[ cut here ]------------
| [ 845.140162][ T5444] WARNING: CPU: 3 PID: 5444 at ./include/net/netdev_lock.h:17 netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
| [  845.140760][ T5444] Modules linked in: act_gact cls_flower act_mirred cls_u32 sch_ingress ifb vxlan nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables
| [  845.142373][ T5444] Tainted: [W]=WARN
[  845.142611][ T5444] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 845.142988][ T5444] RIP: 0010:netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
[ 845.143292][ T5444] Code: 00 00 8b 05 97 05 bc 02 85 c0 0f 84 52 fe ff ff 48 8d bb c0 0c 00 00 be ff ff ff ff e8 fa fd 9b 00 85 c0 0f 85 39 fe ff ff 90 <0f> 0b 90 e9 30 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	8b 05 97 05 bc 02    	mov    0x2bc0597(%rip),%eax        # 0x2bc059f
   8:	85 c0                	test   %eax,%eax
   a:	0f 84 52 fe ff ff    	je     0xfffffffffffffe62
  10:	48 8d bb c0 0c 00 00 	lea    0xcc0(%rbx),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 fa fd 9b 00       	call   0x9bfe1b
  21:	85 c0                	test   %eax,%eax
  23:	0f 85 39 fe ff ff    	jne    0xfffffffffffffe62
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 30 fe ff ff       	jmp    0xfffffffffffffe62
  32:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  39:	fc ff df 
  3c:	4c 89 fa             	mov    %r15,%rdx
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 30 fe ff ff       	jmp    0xfffffffffffffe38
   8:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   f:	fc ff df 
  12:	4c 89 fa             	mov    %r15,%rdx
  15:	48                   	rex.W
[  845.144354][ T5444] RSP: 0018:ffffc9000663eef0 EFLAGS: 00010246
[  845.144728][ T5444] RAX: 0000000000000000 RBX: ffff88801130a000 RCX: 0000000000000001
[  845.145176][ T5444] RDX: 0000000000000000 RSI: ffffffff98d10759 RDI: ffffffff98458280
[  845.145629][ T5444] RBP: ffffc9000663efd8 R08: 0000000000000000 R09: 0000000000000000
[  845.146096][ T5444] R10: ffffc9000663f008 R11: ffffffff9978d1e0 R12: 1ffff92000cc7de2
[  845.146702][ T5444] R13: 00000000000005dc R14: ffffc9000663f008 R15: ffff88801130af48
[  845.147156][ T5444] FS:  00007fd6221b8800(0000) GS:ffff8880d1d19000(0000) knlGS:0000000000000000
[  845.147682][ T5444] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  845.148065][ T5444] CR2: 00000000004e59f8 CR3: 000000000cecd002 CR4: 0000000000772ef0
[  845.148509][ T5444] PKRU: 55555554
[  845.148734][ T5444] Call Trace:
[  845.148967][ T5444]  <TASK>
[ 845.149120][ T5444] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 845.149420][ T5444] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 845.149736][ T5444] netif_set_mtu (net/core/dev.c:9652) 
[ 845.150044][ T5444] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 845.150357][ T5444] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 845.150584][ T5444] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 845.150882][ T5444] br_add_if (net/bridge/br_if.c:697) 
[ 845.151134][ T5444] do_set_master (net/core/rtnetlink.c:2948) 
[ 845.151427][ T5444] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 845.151730][ T5444] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[ 845.152048][ T5444] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[ 845.152426][ T5444] ? mark_held_locks (kernel/locking/lockdep.c:4328) 
[ 845.152738][ T5444] ? irqentry_exit (kernel/entry/common.c:311) 
[ 845.153046][ T5444] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 845.153350][ T5444] ? osq_unlock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2203 ./include/linux/atomic/atomic-instrumented.h:1325 kernel/locking/osq_lock.c:218) 
[ 845.153646][ T5444] ? __pfx_osq_unlock (kernel/locking/osq_lock.c:211) 
[ 845.153950][ T5444] ? mutex_spin_on_owner (./include/linux/instrumented.h:68 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/locking/mutex.h:47 kernel/locking/mutex.c:351) 
[ 845.154259][ T5444] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 845.154555][ T5444] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[ 845.154855][ T5444] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[ 845.155163][ T5444] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 845.155459][ T5444] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[ 845.155750][ T5444] ? __create_object (mm/kmemleak.c:771) 
[ 845.156055][ T5444] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 845.156358][ T5444] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 845.156669][ T5444] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 845.157044][ T5444] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[ 845.157349][ T5444] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[ 845.157648][ T5444] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 845.157951][ T5444] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 845.158254][ T5444] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 845.158557][ T5444] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[ 845.158859][ T5444] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 845.159174][ T5444] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 845.159478][ T5444] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[ 845.159784][ T5444] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 845.160094][ T5444] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 845.160397][ T5444] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 845.160693][ T5444] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 845.160997][ T5444] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 845.161312][ T5444] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 845.161605][ T5444] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 845.161914][ T5444] netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1346) 
[ 845.162212][ T5444] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[ 845.162505][ T5444] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 845.162822][ T5444] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[ 845.163134][ T5444] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[ 845.163437][ T5444] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[ 845.163741][ T5444] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[ 845.164050][ T5444] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[ 845.164341][ T5444] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[ 845.164725][ T5444] ___sys_sendmsg (net/socket.c:2670) 
[ 845.165029][ T5444] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 845.165323][ T5444] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3096) 
[ 845.165705][ T5444] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[ 845.166014][ T5444] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 845.166318][ T5444] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 845.166619][ T5444] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 845.166926][ T5444] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[ 845.167223][ T5444] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 845.167533][ T5444] __sys_sendmsg (net/socket.c:2700) 
[ 845.167836][ T5444] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[ 845.168218][ T5444] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[ 845.168528][ T5444] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 845.168834][ T5444] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 845.169141][ T5444] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  845.169510][ T5444] RIP: 0033:0x7fd6223851e7
[ 845.169818][ T5444] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[  845.170892][ T5444] RSP: 002b:00007fff868e6ea8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  845.171347][ T5444] RAX: ffffffffffffffda RBX: 00007fff868e75d0 RCX: 00007fd6223851e7
[  845.171792][ T5444] RDX: 0000000000000000 RSI: 00007fff868e6f10 RDI: 0000000000000005
[  845.172254][ T5444] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[  845.172707][ T5444] R10: 0000000033e17910 R11: 0000000000000246 R12: 0000000000000004
[  845.173165][ T5444] R13: 00000000686e232a R14: 0000000000499600 R15: 0000000000000000
| [  850.193474][   T12] ------------[ cut here ]------------
| [ 850.193790][ T12] WARNING: CPU: 0 PID: 12 at ./include/net/netdev_lock.h:17 netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
| [  850.194322][   T12] Modules linked in: act_gact cls_flower act_mirred cls_u32 sch_ingress ifb vxlan nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables
| [  850.196513][   T12] Tainted: [W]=WARN
[  850.196746][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  850.197140][   T12] Workqueue: netns cleanup_net
[ 850.197449][ T12] RIP: 0010:netif_set_mtu_ext (./include/net/netdev_lock.h:17 ./include/net/netdev_lock.h:15 ./include/net/netdev_lock.h:25 net/core/dev.c:9610) 
[ 850.197751][ T12] Code: 00 00 8b 05 97 05 bc 02 85 c0 0f 84 52 fe ff ff 48 8d bb c0 0c 00 00 be ff ff ff ff e8 fa fd 9b 00 85 c0 0f 85 39 fe ff ff 90 <0f> 0b 90 e9 30 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	8b 05 97 05 bc 02    	mov    0x2bc0597(%rip),%eax        # 0x2bc059f
   8:	85 c0                	test   %eax,%eax
   a:	0f 84 52 fe ff ff    	je     0xfffffffffffffe62
  10:	48 8d bb c0 0c 00 00 	lea    0xcc0(%rbx),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 fa fd 9b 00       	call   0x9bfe1b
  21:	85 c0                	test   %eax,%eax
  23:	0f 85 39 fe ff ff    	jne    0xfffffffffffffe62
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 30 fe ff ff       	jmp    0xfffffffffffffe62
  32:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  39:	fc ff df 
  3c:	4c 89 fa             	mov    %r15,%rdx
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 30 fe ff ff       	jmp    0xfffffffffffffe38
   8:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   f:	fc ff df 
  12:	4c 89 fa             	mov    %r15,%rdx
  15:	48                   	rex.W
[  850.199056][   T12] RSP: 0018:ffffc900000c75b0 EFLAGS: 00010246
[  850.199429][   T12] RAX: 0000000000000000 RBX: ffff88801130a000 RCX: 0000000000000001
[  850.199864][   T12] RDX: 0000000000000000 RSI: ffffffff98d10759 RDI: ffffffff98458280
[  850.200588][   T12] RBP: ffffc900000c7698 R08: 0000000000000000 R09: 0000000000000000
[  850.201161][   T12] R10: ffffc900000c76c8 R11: ffffffff9569be78 R12: 1ffff92000018eba
[  850.201597][   T12] R13: 00000000000005dc R14: ffffc900000c76c8 R15: ffff88801130af48
[  850.202169][   T12] FS:  0000000000000000(0000) GS:ffff8880d1b99000(0000) knlGS:0000000000000000
[  850.202686][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  850.203225][   T12] CR2: 00005634316cbdec CR3: 000000003954a001 CR4: 0000000000772ef0
[  850.203671][   T12] PKRU: 55555554
[  850.203887][   T12] Call Trace:
[  850.204250][   T12]  <TASK>
[ 850.204402][ T12] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3096) 
[ 850.204772][ T12] ? br_del_if (net/bridge/br_if.c:742) 
[ 850.205002][ T12] ? br_device_event (net/bridge/br.c:141) 
[ 850.205292][ T12] ? notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) 
[ 850.205585][ T12] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 850.205879][ T12] ? cleanup_net (net/core/net_namespace.c:684) 
[ 850.206180][ T12] ? process_one_work (kernel/workqueue.c:3238) 
[ 850.206471][ T12] ? worker_thread (kernel/workqueue.c:3315 kernel/workqueue.c:3402) 
[ 850.206762][ T12] ? kthread (kernel/kthread.c:464) 
[ 850.206988][ T12] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 850.207287][ T12] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 850.207585][ T12] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 850.207895][ T12] netif_set_mtu (net/core/dev.c:9652) 
[ 850.208204][ T12] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 850.208513][ T12] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 850.208738][ T12] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 850.209041][ T12] br_del_if (net/bridge/br_if.c:743) 
[ 850.209263][ T12] br_device_event (net/bridge/br.c:141) 
[ 850.209552][ T12] ? __pfx_br_device_event (net/bridge/br.c:29) 
[ 850.209854][ T12] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) 
[ 850.210172][ T12] unregister_netdevice_many_notify (net/core/dev.c:12107) 
[ 850.210540][ T12] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.h:47 kernel/locking/mutex.c:67) 
[ 850.210831][ T12] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:12032) 
[ 850.211202][ T12] ? unregister_netdevice_queue (net/core/dev.c:12004) 
[ 850.211563][ T12] ? __pfx_unregister_netdevice_queue (net/core/dev.c:12003) 
[ 850.211931][ T12] ? __pfx_unregister_netdevice_queue (net/core/dev.c:12003) 
[ 850.212313][ T12] default_device_exit_batch (net/core/dev.c:12673) 
[ 850.212610][ T12] ? __pfx_default_device_exit_batch (net/core/dev.c:12648) 
[ 850.212992][ T12] ops_undo_list (net/core/net_namespace.c:204 net/core/net_namespace.c:251) 
[ 850.213291][ T12] ? __pfx_ops_undo_list (net/core/net_namespace.c:222) 
[ 850.213581][ T12] ? cleanup_net (./include/linux/list.h:183 net/core/net_namespace.c:679) 
[ 850.213883][ T12] cleanup_net (net/core/net_namespace.c:684) 
[ 850.214184][ T12] ? __pfx_cleanup_net (net/core/net_namespace.c:648) 
[ 850.214482][ T12] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 850.214776][ T12] process_one_work (kernel/workqueue.c:3238) 
[ 850.215081][ T12] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 850.215381][ T12] ? assign_work (kernel/workqueue.c:1200) 
[ 850.215679][ T12] worker_thread (kernel/workqueue.c:3315 kernel/workqueue.c:3402) 
[ 850.215991][ T12] ? __pfx_worker_thread (kernel/workqueue.c:3348) 
[ 850.216284][ T12] kthread (kernel/kthread.c:464) 
[ 850.216503][ T12] ? __pfx_kthread (kernel/kthread.c:413) 
[ 850.216797][ T12] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 850.217095][ T12] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 850.217388][ T12] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 850.217679][ T12] ? __pfx_kthread (kernel/kthread.c:413) 
[ 850.218018][ T12] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 850.218305][ T12] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
netif_set_mtu_ext:netif_set_mtu:dev_set_mtu:br_mtu_auto_adjust:br_del_if
netif_set_mtu_ext:netif_set_mtu:dev_set_mtu:br_mtu_auto_adjust:br_add_if