======================================
| [   17.735461][  T283] veth1: entered promiscuous mode
| [   17.738339][  T283] ------------[ cut here ]------------
| [ 17.738681][ T283] WARNING: CPU: 0 PID: 283 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) 
| [   17.739327][  T283] Modules linked in: bridge stp llc vrf veth
[   17.740414][  T283] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.740819][ T283] 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) 
[ 17.741149][ T283] 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
[   17.742282][  T283] RSP: 0018:ffffc900005c6ef0 EFLAGS: 00010246
[   17.742691][  T283] RAX: 0000000000000000 RBX: ffff88800b472000 RCX: 0000000000000001
[   17.743166][  T283] RDX: 0000000000000000 RSI: ffffffff9649b941 RDI: ffffffff95c555e0
[   17.743657][  T283] RBP: ffffc900005c6fe0 R08: 0000000000000000 R09: 0000000000000000
[   17.744128][  T283] R10: ffffc900005c7010 R11: ffffffff972a8918 R12: 1ffff920000b8de2
[   17.744878][  T283] R13: 00000000000005dc R14: ffffc900005c7010 R15: ffff88800b472f08
[   17.745354][  T283] FS:  00007f922b6f7800(0000) GS:ffff88809dcb7000(0000) knlGS:0000000000000000
[   17.745932][  T283] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   17.746326][  T283] CR2: 00000000004e5aa8 CR3: 000000000e6b6002 CR4: 0000000000772ef0
[   17.746808][  T283] PKRU: 55555554
[   17.747045][  T283] Call Trace:
[   17.747279][  T283]  <TASK>
[ 17.747442][ T283] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 17.747768][ T283] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 17.748094][ T283] ? mark_held_locks (kernel/locking/lockdep.c:4328) 
[ 17.748403][ T283] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.748806][ T283] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 17.749123][ T283] netif_set_mtu (net/core/dev.c:9652) 
[ 17.749434][ T283] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 17.749800][ T283] ? br_get_link_af_size_filtered (net/bridge/br_netlink.c:116) bridge 
[ 17.750279][ T283] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 17.750518][ T283] br_mtu_auto_adjust (net/bridge/br_if.c:525) bridge 
[ 17.750953][ T283] br_add_if (net/bridge/br_if.c:697) bridge 
[ 17.751316][ T283] do_set_master (net/core/rtnetlink.c:2948) 
[ 17.751640][ T283] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[ 17.751953][ T283] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[ 17.752341][ T283] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 17.752667][ T283] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 17.752979][ T283] ? __kernel_text_address (kernel/extable.c:79) 
[ 17.753300][ T283] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 17.753623][ T283] ? __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) 
[ 17.753938][ T283] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:88) 
[ 17.754326][ T283] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.754800][ T283] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.755109][ T283] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[ 17.755419][ T283] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[ 17.755885][ T283] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 17.756202][ T283] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[ 17.756529][ T283] ? __create_object (mm/kmemleak.c:771) 
[ 17.756867][ T283] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 17.757180][ T283] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 17.757501][ T283] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.757897][ T283] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[ 17.758214][ T283] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[ 17.758529][ T283] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 17.758846][ T283] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 17.759170][ T283] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 17.759479][ T283] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[ 17.759802][ T283] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 17.760113][ T283] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 17.760427][ T283] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[ 17.760762][ T283] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 17.761082][ T283] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 17.761394][ T283] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 17.761715][ T283] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 17.762029][ T283] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 17.762355][ T283] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 17.762678][ T283] ? 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) 
[ 17.762995][ T283] netlink_unicast (net/netlink/af_netlink.c:1320 net/netlink/af_netlink.c:1346) 
[ 17.763310][ T283] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[ 17.763628][ T283] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 17.763944][ T283] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[ 17.764260][ T283] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[ 17.764574][ T283] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[ 17.764902][ T283] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[ 17.765228][ T283] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[ 17.765541][ T283] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[ 17.765957][ T283] ___sys_sendmsg (net/socket.c:2670) 
[ 17.766271][ T283] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 17.766597][ T283] ? __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) 
[ 17.766993][ T283] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[ 17.767314][ T283] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 17.767640][ T283] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 17.767960][ T283] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 17.768277][ T283] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[ 17.768601][ T283] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 17.768923][ T283] __sys_sendmsg (net/socket.c:2700) 
[ 17.769229][ T283] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[ 17.769626][ T283] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[ 17.769951][ T283] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.770266][ T283] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 17.770596][ T283] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   17.770983][  T283] RIP: 0033:0x7f922b8c41e7
[ 17.771309][ T283] 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)
[   17.772438][  T283] RSP: 002b:00007ffc51701ec8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   17.772923][  T283] RAX: ffffffffffffffda RBX: 00007ffc517025f0 RCX: 00007f922b8c41e7
[   17.773402][  T283] RDX: 0000000000000000 RSI: 00007ffc51701f30 RDI: 0000000000000005
[   17.773885][  T283] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[   17.774360][  T283] R10: 0000000014bc1910 R11: 0000000000000246 R12: 0000000000000004


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