======================================
| [ 4987.002216][T19764] eth1: entered promiscuous mode
| [ 4987.005169][T19764] ------------[ cut here ]------------
| [4987.005483][T19764] WARNING: CPU: 3 PID: 19764 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) 
| [ 4987.006503][T19764] Modules linked in: ip6t_REJECT ipt_REJECT nft_compat nf_tables
[ 4987.007591][T19764] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[4987.007984][T19764] 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) 
[ 4987.008326][T19764] 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
[ 4987.009397][T19764] RSP: 0018:ffffc90000ea6ef0 EFLAGS: 00010246
[ 4987.009774][T19764] RAX: 0000000000000000 RBX: ffff888012c62000 RCX: 0000000000000001
[ 4987.010234][T19764] RDX: 0000000000000000 RSI: ffffffff95110759 RDI: ffffffff94858280
[ 4987.010678][T19764] RBP: ffffc90000ea6fd8 R08: 0000000000000000 R09: 0000000000000000
[ 4987.011129][T19764] R10: ffffc90000ea7008 R11: ffffffff95b8d1e0 R12: 1ffff920001d4de2
[ 4987.011580][T19764] R13: 00000000000005dc R14: ffffc90000ea7008 R15: ffff888012c62f48
[ 4987.012029][T19764] FS:  00007fb38af43800(0000) GS:ffff8880d5919000(0000) knlGS:0000000000000000
[ 4987.012555][T19764] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4987.012931][T19764] CR2: 00000000004e59f8 CR3: 00000000026eb001 CR4: 0000000000772ef0
[ 4987.013388][T19764] PKRU: 55555554
[ 4987.013614][T19764] Call Trace:
[ 4987.013838][T19764]  <TASK>
[4987.014000][T19764] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[4987.014316][T19764] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4987.014629][T19764] netif_set_mtu (net/core/dev.c:9652) 
[4987.014926][T19764] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[4987.015256][T19764] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[4987.015497][T19764] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[4987.015826][T19764] br_add_if (net/bridge/br_if.c:697) 
[4987.016082][T19764] ? 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) 
[4987.016412][T19764] do_set_master (net/core/rtnetlink.c:2948) 
[4987.016721][T19764] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[4987.017042][T19764] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[4987.017367][T19764] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[4987.017763][T19764] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[4987.018089][T19764] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[4987.018402][T19764] ? __kernel_text_address (kernel/extable.c:79) 
[4987.018724][T19764] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4987.019039][T19764] ? __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) 
[4987.019363][T19764] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:88) 
[4987.019748][T19764] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[4987.020075][T19764] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[4987.020385][T19764] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[4987.020680][T19764] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[4987.020983][T19764] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[4987.021289][T19764] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[4987.021583][T19764] ? __create_object (mm/kmemleak.c:771) 
[4987.021881][T19764] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[4987.022188][T19764] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[4987.022490][T19764] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[4987.022854][T19764] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[4987.023175][T19764] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[4987.023476][T19764] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[4987.023770][T19764] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4987.024084][T19764] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[4987.024382][T19764] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[4987.024673][T19764] ? __lock_release (kernel/locking/lockdep.c:5539) 
[4987.024971][T19764] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[4987.025275][T19764] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[4987.025577][T19764] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[4987.025884][T19764] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4987.026216][T19764] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[4987.026528][T19764] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[4987.026823][T19764] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[4987.027142][T19764] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[4987.027439][T19764] ? 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) 
[4987.027740][T19764] netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1346) 
[4987.028039][T19764] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[4987.028344][T19764] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4987.028644][T19764] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[4987.028942][T19764] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[4987.029247][T19764] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[4987.029550][T19764] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[4987.029850][T19764] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[4987.030163][T19764] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[4987.030545][T19764] ___sys_sendmsg (net/socket.c:2670) 
[4987.030840][T19764] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[4987.031143][T19764] ? __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) 
[4987.031518][T19764] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[4987.031816][T19764] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[4987.032132][T19764] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[4987.032433][T19764] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[4987.032726][T19764] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[4987.033024][T19764] ? __lock_release (kernel/locking/lockdep.c:5539) 
[4987.033339][T19764] __sys_sendmsg (net/socket.c:2700) 
[4987.033633][T19764] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[4987.033997][T19764] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[4987.034317][T19764] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[4987.034620][T19764] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[4987.034917][T19764] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 4987.035295][T19764] RIP: 0033:0x7fb38b1101e7
[ 4987.035603][T19764] 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)
[ 4987.036721][T19764] RSP: 002b:00007fff50a8f428 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 4987.037188][T19764] RAX: ffffffffffffffda RBX: 00007fff50a8fb50 RCX: 00007fb38b1101e7
[ 4987.037635][T19764] RDX: 0000000000000000 RSI: 00007fff50a8f490 RDI: 0000000000000005
[ 4987.038093][T19764] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000000
[ 4987.038558][T19764] R10: 0000000024440910 R11: 0000000000000246 R12: 0000000000000003


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