======================================
| [  229.810222][ T2350] vx10: entered promiscuous mode
| [  229.813580][ T2350] ------------[ cut here ]------------
| [ 229.813947][ T2350] WARNING: CPU: 2 PID: 2350 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) 
| [  229.815377][ T2350] Modules linked in: vxlan
[  229.816399][ T2350] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 229.816811][ T2350] 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) 
[ 229.817163][ T2350] 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
[  229.818334][ T2350] RSP: 0018:ffffc90002da6ef0 EFLAGS: 00010246
[  229.818752][ T2350] RAX: 0000000000000000 RBX: ffff88800d542000 RCX: 0000000000000001
[  229.819245][ T2350] RDX: 0000000000000000 RSI: ffffffffa0510759 RDI: ffffffff9fc58280
[  229.819726][ T2350] RBP: ffffc90002da6fd8 R08: 0000000000000000 R09: 0000000000000000
[  229.820243][ T2350] R10: ffffc90002da7008 R11: ffffffffa0f8d1e0 R12: 1ffff920005b4de2
[  229.820727][ T2350] R13: 00000000000005dc R14: ffffc90002da7008 R15: ffff88800d542f48
[  229.821222][ T2350] FS:  00007f834eec2800(0000) GS:ffff8880c2e99000(0000) knlGS:0000000000000000
[  229.822064][ T2350] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  229.822527][ T2350] CR2: 00000000004e5ce0 CR3: 0000000008d9c001 CR4: 0000000000772ef0
[  229.823034][ T2350] PKRU: 55555554
[  229.823309][ T2350] Call Trace:
[  229.823574][ T2350]  <TASK>
[ 229.823765][ T2350] ? __pfx_netif_set_mtu_ext (net/core/dev.c:9607) 
[ 229.824109][ T2350] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 229.824481][ T2350] netif_set_mtu (net/core/dev.c:9652) 
[ 229.824812][ T2350] ? __pfx_netif_set_mtu (net/core/dev.c:9647) 
[ 229.825168][ T2350] dev_set_mtu (./include/net/netdev_lock.h:30 ./include/net/netdev_lock.h:47 net/core/dev_api.c:249) 
[ 229.825438][ T2350] br_mtu_auto_adjust (net/bridge/br_if.c:525) 
[ 229.825783][ T2350] br_add_if (net/bridge/br_if.c:697) 
[ 229.826048][ T2350] do_set_master (net/core/rtnetlink.c:2948) 
[ 229.826402][ T2350] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 229.826752][ T2350] do_setlink.constprop.0 (net/core/rtnetlink.c:3150) 
[ 229.827096][ T2350] ? __pfx_do_setlink.constprop.0 (net/core/rtnetlink.c:3021) 
[ 229.827534][ T2350] ? rcu_read_lock_any_held (kernel/rcu/update.c:386 kernel/rcu/update.c:380) 
[ 229.827879][ T2350] ? validate_chain (kernel/locking/lockdep.c:3804 kernel/locking/lockdep.c:3824 kernel/locking/lockdep.c:3879) 
[ 229.828243][ T2350] ? __kernel_text_address (kernel/extable.c:79) 
[ 229.828570][ T2350] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 229.828904][ T2350] ? __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) 
[ 229.829249][ T2350] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:88) 
[ 229.829651][ T2350] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 229.829997][ T2350] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 229.830336][ T2350] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 21)) 
[ 229.830661][ T2350] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:728 kernel/locking/mutex.c:747) 
[ 229.830992][ T2350] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 229.831348][ T2350] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4056) 
[ 229.831677][ T2350] ? __create_object (mm/kmemleak.c:771) 
[ 229.832022][ T2350] ? __pfx___mutex_lock (kernel/locking/mutex.c:746) 
[ 229.832365][ T2350] ? trace_cap_capable (./include/trace/events/capability.h:26 (discriminator 21)) 
[ 229.832709][ T2350] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 229.833112][ T2350] ? __rtnl_newlink (net/core/rtnetlink.c:3907) 
[ 229.833466][ T2350] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4058) 
[ 229.833794][ T2350] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 229.834119][ T2350] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 229.834469][ T2350] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 229.834812][ T2350] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/rtnetlink.c:6944) 
[ 229.835146][ T2350] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 229.835506][ T2350] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3948) 
[ 229.835854][ T2350] rtnetlink_rcv_msg (net/core/rtnetlink.c:6946) 
[ 229.836213][ T2350] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 229.836558][ T2350] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 229.836885][ T2350] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 229.837230][ T2350] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6849) 
[ 229.837567][ T2350] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 229.837912][ T2350] ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/netlink/af_netlink.c:340) 
[ 229.838285][ T2350] ? 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) 
[ 229.838623][ T2350] netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1346) 
[ 229.838964][ T2350] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1331) 
[ 229.839321][ T2350] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 229.839670][ T2350] netlink_sendmsg (net/netlink/af_netlink.c:1896) 
[ 229.840016][ T2350] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1815) 
[ 229.840369][ T2350] ? __import_iovec (lib/iov_iter.c:1441 lib/iov_iter.c:1456) 
[ 229.840723][ T2350] ____sys_sendmsg (net/socket.c:714 net/socket.c:729 net/socket.c:2614) 
[ 229.841068][ T2350] ? __pfx_____sys_sendmsg (net/socket.c:2560) 
[ 229.841422][ T2350] ? __pfx_copy_msghdr_from_user (net/socket.c:2540) 
[ 229.841857][ T2350] ___sys_sendmsg (net/socket.c:2670) 
[ 229.842203][ T2350] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 229.842548][ T2350] ? __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) 
[ 229.842972][ T2350] ? __pfx____sys_sendmsg (net/socket.c:2657) 
[ 229.843332][ T2350] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 229.843676][ T2350] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 229.844025][ T2350] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 229.844379][ T2350] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2168 arch/x86/mm/physaddr.c:65) 
[ 229.844720][ T2350] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 229.845070][ T2350] __sys_sendmsg (net/socket.c:2700) 
[ 229.845433][ T2350] ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3119) 
[ 229.845855][ T2350] ? __pfx___sys_sendmsg (net/socket.c:2685) 
[ 229.846228][ T2350] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 229.846568][ T2350] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 229.846913][ T2350] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  229.847350][ T2350] RIP: 0033:0x7f834f08f1e7
[ 229.847702][ T2350] 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)
[  229.848909][ T2350] RSP: 002b:00007ffc6adf21c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  229.849424][ T2350] RAX: ffffffffffffffda RBX: 00007ffc6adf2900 RCX: 00007f834f08f1e7
[  229.849921][ T2350] RDX: 0000000000000000 RSI: 00007ffc6adf2230 RDI: 0000000000000005
[  229.850416][ T2350] RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000000
[  229.850911][ T2350] R10: 000000002dda8910 R11: 0000000000000246 R12: 0000000000000004


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