======================================
| [  111.736499][ T1263] veth1: entered promiscuous mode
| [  111.738954][ T1263] ------------[ cut here ]------------
| [ 111.739300][ T1263] WARNING: CPU: 2 PID: 1263 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) 
| [  111.739986][ T1263] Modules linked in: bridge stp llc 8021q act_gact cls_flower sch_ingress vrf veth
[  111.741529][ T1263] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 111.741947][ T1263] 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) 
[ 111.742282][ T1263] Code: 00 00 8b 05 d7 bc 3a 02 85 c0 0f 84 52 fe ff ff 48 8d bb a0 0c 00 00 be ff ff ff ff e8 1a 63 7b 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 d7 bc 3a 02    	mov    0x23abcd7(%rip),%eax        # 0x23abcdf
   8:	85 c0                	test   %eax,%eax
   a:	0f 84 52 fe ff ff    	je     0xfffffffffffffe62
  10:	48 8d bb a0 0c 00 00 	lea    0xca0(%rbx),%rdi
  17:	be ff ff ff ff       	mov    $0xffffffff,%esi
  1c:	e8 1a 63 7b 00       	call   0x7b633b
  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
[  111.743408][ T1263] RSP: 0018:ffffc90001e8eef0 EFLAGS: 00010246
[  111.743823][ T1263] RAX: 0000000000000000 RBX: ffff888009712000 RCX: 0000000000000001
[  111.744557][ T1263] RDX: 0000000000000000 RSI: ffffffffbae9b941 RDI: ffffffffba6555e0
[  111.745050][ T1263] RBP: ffffc90001e8efe0 R08: 0000000000000000 R09: 0000000000000000
[  111.745531][ T1263] R10: ffffc90001e8f010 R11: ffffffffbbca8918 R12: 1ffff920003d1de2
[  111.746018][ T1263] R13: 00000000000005dc R14: ffffc90001e8f010 R15: ffff888009712f08
[  111.746492][ T1263] FS:  00007fe940cfb800(0000) GS:ffff8880793b7000(0000) knlGS:0000000000000000
[  111.747057][ T1263] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  111.747467][ T1263] CR2: 00000000004e5aa8 CR3: 000000000aa48003 CR4: 0000000000772ef0
[  111.747955][ T1263] PKRU: 55555554
[  111.748205][ T1263] Call Trace:
[  111.748454][ T1263]  <TASK>
[ 111.748640][ T1263] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 111.748978][ T1263] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 111.749319][ T1263] ? mark_held_locks (kernel/locking/lockdep.c:4328) 
[ 111.749663][ T1263] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 111.750062][ T1263] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 111.750387][ T1263] netif_set_mtu (net/core/dev.c:9652) 
[ 111.750724][ T1263] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 111.751054][ T1263] ? br_get_link_af_size_filtered (net/bridge/br_netlink.c:116) bridge 
[ 111.751491][ T1263] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 111.751749][ T1263] br_mtu_auto_adjust (net/bridge/br_if.c:525) bridge 
[ 111.752279][ T1263] br_add_if (net/bridge/br_if.c:697) bridge 
[ 111.752656][ T1263] do_set_master (net/core/rtnetlink.c:2948) 
[ 111.752986][ T1263] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[ 111.753314][ T1263] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[ 111.753728][ T1263] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 111.754051][ T1263] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 111.754375][ T1263] ? __kernel_text_address (kernel/extable.c:79) 
[ 111.754711][ T1263] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 111.755036][ T1263] ? __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) 
[ 111.755357][ T1263] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:88) 
[ 111.755780][ T1263] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 111.756104][ T1263] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 111.756424][ T1263] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[ 111.756761][ T1263] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[ 111.757082][ T1263] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 111.757401][ T1263] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[ 111.757730][ T1263] ? __create_object (mm/kmemleak.c:771) 
[ 111.758055][ T1263] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 111.758380][ T1263] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 111.758708][ T1263] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 111.759110][ T1263] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[ 111.759451][ T1263] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[ 111.759801][ T1263] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 111.760122][ T1263] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 111.760451][ T1263] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 111.760782][ T1263] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[ 111.761102][ T1263] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 111.761422][ T1263] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 111.761756][ T1263] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[ 111.762079][ T1263] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 111.762405][ T1263] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 111.762748][ T1263] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 111.763072][ T1263] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 111.763391][ T1263] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 111.763732][ T1263] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 111.764053][ T1263] ? 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) 
[ 111.764374][ T1263] netlink_unicast (net/netlink/af_netlink.c:1320 net/netlink/af_netlink.c:1346) 
[ 111.764721][ T1263] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[ 111.765048][ T1263] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 111.765375][ T1263] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[ 111.765712][ T1263] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[ 111.766033][ T1263] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[ 111.766369][ T1263] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[ 111.766705][ T1263] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[ 111.767024][ T1263] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[ 111.767431][ T1263] ___sys_sendmsg (net/socket.c:2670) 
[ 111.767757][ T1263] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 111.768104][ T1263] ? __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) 
[ 111.768506][ T1263] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[ 111.768844][ T1263] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 111.769197][ T1263] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 111.769542][ T1263] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 111.769882][ T1263] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[ 111.770203][ T1263] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 111.770533][ T1263] __sys_sendmsg (net/socket.c:2700) 
[ 111.770868][ T1263] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[ 111.771266][ T1263] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[ 111.771597][ T1263] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 111.771940][ T1263] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 111.772262][ T1263] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  111.772665][ T1263] RIP: 0033:0x7fe940ec81e7
[ 111.773005][ T1263] Code: Unable to access opcode bytes at 0x7fe940ec81bd.

Code starting with the faulting instruction
===========================================
[  111.773415][ T1263] RSP: 002b:00007ffdfeff5f68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  111.774204][ T1263] RAX: ffffffffffffffda RBX: 00007ffdfeff6690 RCX: 00007fe940ec81e7
[  111.774691][ T1263] RDX: 0000000000000000 RSI: 00007ffdfeff5fd0 RDI: 0000000000000005
[  111.775164][ T1263] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[  111.775880][ T1263] R10: 00000000063f6910 R11: 0000000000000246 R12: 0000000000000004


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