======================================
| [ 3266.851598] br0: port 1(eth1) entered disabled state
| [ 3266.851669] br0: port 1(eth1) entered blocking state
| [ 3266.851708] br0: port 1(eth1) entered forwarding state
| [ 3276.156590] Oops: general protection fault, probably for non-canonical address 0xdead000000000122: 0000 [#1] PREEMPT SMP NOPTI
[ 3276.156741] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 3276.156813] RIP: 0010:neigh_flush_dev.isra.0 (./include/linux/list.h:988 ./include/linux/rculist.h:516 net/core/neighbour.c:384) 
[ 3276.156859] Code: 89 d6 48 83 ed 10 0f 84 08 01 00 00 48 8b 5d 10 45 84 f6 74 0d 80 bd 9c 00 00 00 00 0f 88 e0 00 00 00 48 8b 45 00 48 8b 55 08 <48> 89 02 48 85 c0 74 04 48 89 50 08 48 8b 45 10 48 8b 55 18 4c 89
All code
========
   0:	89 d6                	mov    %edx,%esi
   2:	48 83 ed 10          	sub    $0x10,%rbp
   6:	0f 84 08 01 00 00    	je     0x114
   c:	48 8b 5d 10          	mov    0x10(%rbp),%rbx
  10:	45 84 f6             	test   %r14b,%r14b
  13:	74 0d                	je     0x22
  15:	80 bd 9c 00 00 00 00 	cmpb   $0x0,0x9c(%rbp)
  1c:	0f 88 e0 00 00 00    	js     0x102
  22:	48 8b 45 00          	mov    0x0(%rbp),%rax
  26:	48 8b 55 08          	mov    0x8(%rbp),%rdx
  2a:*	48 89 02             	mov    %rax,(%rdx)		<-- trapping instruction
  2d:	48 85 c0             	test   %rax,%rax
  30:	74 04                	je     0x36
  32:	48 89 50 08          	mov    %rdx,0x8(%rax)
  36:	48 8b 45 10          	mov    0x10(%rbp),%rax
  3a:	48 8b 55 18          	mov    0x18(%rbp),%rdx
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 89 02             	mov    %rax,(%rdx)
   3:	48 85 c0             	test   %rax,%rax
   6:	74 04                	je     0xc
   8:	48 89 50 08          	mov    %rdx,0x8(%rax)
   c:	48 8b 45 10          	mov    0x10(%rbp),%rax
  10:	48 8b 55 18          	mov    0x18(%rbp),%rdx
  14:	4c                   	rex.WR
  15:	89                   	.byte 0x89
[ 3276.156979] RSP: 0018:ffffbdacc10536e0 EFLAGS: 00010246
[ 3276.157014] RAX: ffffa02343960400 RBX: ffffa02343961c10 RCX: 0000000000000020
[ 3276.157064] RDX: dead000000000122 RSI: ffffa02343a15000 RDI: 0000000000000002
[ 3276.157113] RBP: ffffa023412c2600 R08: 0000000000000018 R09: 00000000000000c8
[ 3276.157162] R10: ffffa02342495ff0 R11: 0000000000000000 R12: ffffffff93e2dda0
[ 3276.157212] R13: dead000000000122 R14: 0000000000000000 R15: 0000000000000000
[ 3276.157264] FS:  00007f40c1f3f800(0000) GS:ffffa0237ed80000(0000) knlGS:0000000000000000
[ 3276.157325] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3276.157374] CR2: 00000000004e3868 CR3: 0000000002c14006 CR4: 0000000000772ef0
[ 3276.157432] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3276.157480] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 3276.157530] PKRU: 55555554
[ 3276.157551] Call Trace:
[ 3276.157577]  <TASK>
[ 3276.157602] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 3276.157637] ? exc_general_protection (arch/x86/kernel/traps.c:748 arch/x86/kernel/traps.c:693) 
[ 3276.157680] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 3276.157723] ? neigh_flush_dev.isra.0 (./include/linux/list.h:988 ./include/linux/rculist.h:516 net/core/neighbour.c:384) 
[ 3276.157763] __neigh_ifdown.isra.0 (net/core/neighbour.c:425) 
[ 3276.157804] neigh_ifdown (net/core/neighbour.c:445) 
[ 3276.157844] fib_netdev_event (net/ipv4/fib_frontend.c:1521) 
[ 3276.157887] notifier_call_chain (kernel/notifier.c:93) 
[ 3276.157922] __netdev_upper_dev_unlink (net/core/dev.c:7299 (discriminator 11) net/core/dev.c:7669 (discriminator 11) net/core/dev.c:7704 (discriminator 11) net/core/dev.c:8156 (discriminator 11)) 
[ 3276.157963] netdev_upper_dev_unlink (net/core/dev.c:8181) 
[ 3276.158000] vrf_del_slave (drivers/net/vrf.c:1131 drivers/net/vrf.c:1140) 
[ 3276.158043] do_set_master (net/core/rtnetlink.c:2762) 
[ 3276.158076] do_setlink (net/core/rtnetlink.c:2982) 
[ 3276.158109] ? __nla_validate_parse (./include/net/netlink.h:1267 (discriminator 1) lib/nlattr.c:622 (discriminator 1)) 
[ 3276.158149] __rtnl_newlink (net/core/rtnetlink.c:3771) 
[ 3276.158179] ? __kmalloc_cache_noprof (./include/linux/kernel.h:73 ./include/linux/sched/mm.h:321 mm/slub.c:4036 mm/slub.c:4114 mm/slub.c:4290) 
[ 3276.158225] ? rtnl_newlink (net/core/rtnetlink.c:3815) 
[ 3276.158254] rtnl_newlink (net/core/rtnetlink.c:3819) 
[ 3276.158287] rtnetlink_rcv_msg (net/core/rtnetlink.c:6721) 
[ 3276.158315] ? get_page_from_freelist (mm/page_alloc.c:1035 mm/page_alloc.c:1535 mm/page_alloc.c:1545 mm/page_alloc.c:3457) 
[ 3276.158357] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6615) 
[ 3276.158397] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 3276.158434] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 3276.158471] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 3276.158499] ____sys_sendmsg (net/socket.c:729 net/socket.c:744 net/socket.c:2607) 
[ 3276.158535] ? copy_msghdr_from_user (net/socket.c:2547) 
[ 3276.158573] ___sys_sendmsg (net/socket.c:2663) 
[ 3276.158603] ? do_wp_page (./include/linux/mmu_notifier.h:468 mm/memory.c:3460 mm/memory.c:3745) 
[ 3276.158640] ? __pte_offset_map (./include/linux/pgtable.h:324 ./include/linux/pgtable.h:594 mm/pgtable-generic.c:289) 
[ 3276.158677] ? __pte_offset_map (./include/linux/pgtable.h:324 ./include/linux/pgtable.h:594 mm/pgtable-generic.c:289) 
[ 3276.158712] ? fsnotify_grab_connector (fs/notify/mark.c:696) 
[ 3276.158758] ? fsnotify_destroy_marks (fs/notify/mark.c:923) 
[ 3276.158794] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2692) 
[ 3276.158827] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 3276.158862] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 3276.158905] RIP: 0033:0x7f40c214b7b7
[ 3276.158935] Code: 0a 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:	0a 00                	or     (%rax),%al
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   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)
[ 3276.159050] RSP: 002b:00007ffc8fbdb038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 3276.159105] RAX: ffffffffffffffda RBX: 00007ffc8fbdb760 RCX: 00007f40c214b7b7
[ 3276.159161] RDX: 0000000000000000 RSI: 00007ffc8fbdb0a0 RDI: 0000000000000005
[ 3276.159222] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[ 3276.159277] R10: 00007f40c2009ef8 R11: 0000000000000246 R12: 0000000000000002


Finger prints:
neigh_ifdown:fib_netdev_event:notifier_call_chain:__netdev_upper_dev_unlink:netdev_upper_dev_unlink