======================================
| [ 4994.378338][T19769] eth1: entered promiscuous mode
| [ 4994.381473][T19769] ------------[ cut here ]------------
| [4994.381864][T19769] WARNING: CPU: 3 PID: 19769 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) 
| [ 4994.383276][T19769] Modules linked in: ip6t_REJECT ipt_REJECT nft_compat nf_tables
[ 4994.384876][T19769] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[4994.385441][T19769] 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) 
[ 4994.386016][T19769] 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
[ 4994.387666][T19769] RSP: 0018:ffffc90000956ef0 EFLAGS: 00010246
[ 4994.388182][T19769] RAX: 0000000000000000 RBX: ffff88800aa32000 RCX: 0000000000000001
[ 4994.388797][T19769] RDX: 0000000000000000 RSI: ffffffff8c510759 RDI: ffffffff8bc58280
[ 4994.389555][T19769] RBP: ffffc90000956fd8 R08: 0000000000000000 R09: 0000000000000000
[ 4994.390194][T19769] R10: ffffc90000957008 R11: ffffffff8cf8d1e0 R12: 1ffff9200012ade2
[ 4994.390800][T19769] R13: 00000000000005dc R14: ffffc90000957008 R15: ffff88800aa32f48
[ 4994.391499][T19769] FS:  00007f0384d24800(0000) GS:ffff8880de519000(0000) knlGS:0000000000000000
[ 4994.392254][T19769] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4994.392887][T19769] CR2: 00000000004e59f8 CR3: 000000000d337001 CR4: 0000000000772ef0
[ 4994.393696][T19769] PKRU: 55555554
[ 4994.394118][T19769] Call Trace:
[ 4994.394524][T19769]  <TASK>
[4994.394829][T19769] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[4994.395376][T19769] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4994.395971][T19769] netif_set_mtu (net/core/dev.c:9652) 
[4994.396496][T19769] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[4994.397091][T19769] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[4994.397478][T19769] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[4994.398030][T19769] br_add_if (net/bridge/br_if.c:697) 
[4994.398436][T19769] ? cycle_netdev (./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/netdevice.h:3901 drivers/net/vrf.c:1048) 
[4994.399010][T19769] do_set_master (net/core/rtnetlink.c:2948) 
[4994.399444][T19769] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[4994.399946][T19769] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[4994.400475][T19769] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[4994.401152][T19769] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[4994.401676][T19769] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[4994.402214][T19769] ? __kernel_text_address (kernel/extable.c:79) 
[4994.402654][T19769] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4994.403110][T19769] ? __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) 
[4994.403515][T19769] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:88) 
[4994.404140][T19769] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[4994.404549][T19769] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[4994.405071][T19769] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[4994.405589][T19769] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[4994.406149][T19769] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[4994.406669][T19769] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[4994.407202][T19769] ? __create_object (mm/kmemleak.c:771) 
[4994.407734][T19769] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[4994.408288][T19769] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[4994.408833][T19769] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[4994.409477][T19769] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[4994.410036][T19769] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[4994.410567][T19769] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[4994.411095][T19769] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4994.411628][T19769] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[4994.412175][T19769] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[4994.412691][T19769] ? __lock_release (kernel/locking/lockdep.c:5539) 
[4994.413224][T19769] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[4994.413744][T19769] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[4994.414296][T19769] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[4994.414756][T19769] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4994.415221][T19769] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[4994.415750][T19769] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[4994.416290][T19769] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[4994.416715][T19769] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[4994.417195][T19769] ? 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) 
[4994.417731][T19769] netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1346) 
[4994.418162][T19769] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[4994.418544][T19769] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4994.419047][T19769] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[4994.419457][T19769] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[4994.419961][T19769] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[4994.420502][T19769] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[4994.421045][T19769] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[4994.421570][T19769] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[4994.422260][T19769] ___sys_sendmsg (net/socket.c:2670) 
[4994.422788][T19769] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[4994.423309][T19769] ? __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) 
[4994.423858][T19769] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[4994.424299][T19769] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[4994.424845][T19769] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4994.425376][T19769] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[4994.425766][T19769] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[4994.426171][T19769] ? __lock_release (kernel/locking/lockdep.c:5539) 
[4994.426696][T19769] __sys_sendmsg (net/socket.c:2700) 
[4994.427229][T19769] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[4994.427881][T19769] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[4994.428426][T19769] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[4994.428970][T19769] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[4994.429498][T19769] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 4994.430164][T19769] RIP: 0033:0x7f0384ef11e7
[ 4994.430706][T19769] 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)
[ 4994.432588][T19769] RSP: 002b:00007fffab257568 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 4994.433386][T19769] RAX: ffffffffffffffda RBX: 00007fffab257c90 RCX: 00007f0384ef11e7
[ 4994.434181][T19769] RDX: 0000000000000000 RSI: 00007fffab2575d0 RDI: 0000000000000005
[ 4994.434969][T19769] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[ 4994.435760][T19769] R10: 000000001c216910 R11: 0000000000000246 R12: 0000000000000003


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