======================================
| [  109.523799][ T1391] vx10: entered promiscuous mode
| [  109.526923][ T1391] ------------[ cut here ]------------
| [ 109.527282][ T1391] WARNING: CPU: 2 PID: 1391 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) 
| [  109.527942][ T1391] Modules linked in: vxlan
[  109.528925][ T1391] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 109.529564][ T1391] 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) 
[ 109.529903][ T1391] 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
[  109.531026][ T1391] RSP: 0018:ffffc90003076ef0 EFLAGS: 00010246
[  109.531448][ T1391] RAX: 0000000000000000 RBX: ffff88800ef82000 RCX: 0000000000000001
[  109.532087][ T1391] RDX: 0000000000000000 RSI: ffffffffadb10759 RDI: ffffffffad258280
[  109.532577][ T1391] RBP: ffffc90003076fd8 R08: 0000000000000000 R09: 0000000000000000
[  109.533055][ T1391] R10: ffffc90003077008 R11: ffffffffae58d1e0 R12: 1ffff9200060ede2
[  109.533559][ T1391] R13: 00000000000005dc R14: ffffc90003077008 R15: ffff88800ef82f48
[  109.534039][ T1391] FS:  00007f5e4476e800(0000) GS:ffff8880bce99000(0000) knlGS:0000000000000000
[  109.534613][ T1391] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  109.535016][ T1391] CR2: 00000000004e5ce0 CR3: 0000000002084003 CR4: 0000000000772ef0
[  109.535508][ T1391] PKRU: 55555554
[  109.535760][ T1391] Call Trace:
[  109.536007][ T1391]  <TASK>
[ 109.536188][ T1391] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 109.536536][ T1391] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 109.536883][ T1391] netif_set_mtu (net/core/dev.c:9652) 
[ 109.537208][ T1391] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 109.537557][ T1391] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 109.537807][ T1391] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 109.538141][ T1391] br_add_if (net/bridge/br_if.c:697) 
[ 109.538411][ T1391] do_set_master (net/core/rtnetlink.c:2948) 
[ 109.538738][ T1391] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 109.539072][ T1391] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[ 109.539423][ T1391] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[ 109.539826][ T1391] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 109.540155][ T1391] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 109.540482][ T1391] ? __kernel_text_address (kernel/extable.c:79) 
[ 109.540806][ T1391] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 109.541131][ T1391] ? __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) 
[ 109.541468][ T1391] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:88) 
[ 109.541864][ T1391] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 109.542191][ T1391] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 109.542522][ T1391] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[ 109.542848][ T1391] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[ 109.543181][ T1391] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 109.543515][ T1391] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[ 109.543836][ T1391] ? __create_object (mm/kmemleak.c:771) 
[ 109.544168][ T1391] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 109.544513][ T1391] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 109.544851][ T1391] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 109.545250][ T1391] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[ 109.545591][ T1391] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[ 109.545918][ T1391] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 109.546244][ T1391] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 109.546580][ T1391] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 109.546907][ T1391] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[ 109.547226][ T1391] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 109.547559][ T1391] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 109.547879][ T1391] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[ 109.548203][ T1391] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 109.548538][ T1391] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 109.548869][ T1391] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 109.549196][ T1391] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 109.549529][ T1391] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 109.549860][ T1391] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 109.550180][ T1391] ? 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) 
[ 109.550514][ T1391] netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1346) 
[ 109.550840][ T1391] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[ 109.551166][ T1391] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 109.551503][ T1391] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[ 109.551828][ T1391] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[ 109.552151][ T1391] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[ 109.552498][ T1391] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[ 109.552828][ T1391] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[ 109.553150][ T1391] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[ 109.553571][ T1391] ___sys_sendmsg (net/socket.c:2670) 
[ 109.553893][ T1391] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 109.554218][ T1391] ? __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) 
[ 109.554636][ T1391] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[ 109.554961][ T1391] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 109.555296][ T1391] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 109.555623][ T1391] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 109.555950][ T1391] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[ 109.556292][ T1391] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 109.556623][ T1391] __sys_sendmsg (net/socket.c:2700) 
[ 109.556941][ T1391] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[ 109.557346][ T1391] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[ 109.557682][ T1391] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 109.558004][ T1391] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 109.558348][ T1391] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  109.558751][ T1391] RIP: 0033:0x7f5e4493b1e7
[ 109.559093][ T1391] 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)
[  109.560215][ T1391] RSP: 002b:00007ffc819a5c98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  109.560717][ T1391] RAX: ffffffffffffffda RBX: 00007ffc819a63d0 RCX: 00007f5e4493b1e7
[  109.561199][ T1391] RDX: 0000000000000000 RSI: 00007ffc819a5d00 RDI: 0000000000000005
[  109.561684][ T1391] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[  109.562164][ T1391] R10: 00000000142f7910 R11: 0000000000000246 R12: 0000000000000004


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