======================================
| [  819.344961][   T11] vx10: left promiscuous mode
| [  819.345237][   T11] br1: port 1(vx10) entered disabled state
| [  821.923244][ T4679] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [  821.923643][ T4679] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
[  821.924071][ T4679] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 821.924392][ T4679] RIP: 0010:neigh_flush_dev.isra.0 (./include/linux/list.h:988 ./include/linux/rculist.h:516 net/core/neighbour.c:384) 
[ 821.924589][ T4679] Code: 0f 85 ef 04 00 00 49 8d 7f 08 49 8b 1f 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 cc 04 00 00 49 8b 6f 08 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 19 05 00 00 48 89 5d 00 48 85 db 74 1a 48 8d
All code
========
   0:	0f 85 ef 04 00 00    	jne    0x4f5
   6:	49 8d 7f 08          	lea    0x8(%r15),%rdi
   a:	49 8b 1f             	mov    (%r15),%rbx
   d:	48 89 f8             	mov    %rdi,%rax
  10:	48 c1 e8 03          	shr    $0x3,%rax
  14:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  19:	0f 85 cc 04 00 00    	jne    0x4eb
  1f:	49 8b 6f 08          	mov    0x8(%r15),%rbp
  23:	48 89 e8             	mov    %rbp,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
  2a:*	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)		<-- trapping instruction
  2f:	0f 85 19 05 00 00    	jne    0x54e
  35:	48 89 5d 00          	mov    %rbx,0x0(%rbp)
  39:	48 85 db             	test   %rbx,%rbx
  3c:	74 1a                	je     0x58
  3e:	48                   	rex.W
  3f:	8d                   	.byte 0x8d

Code starting with the faulting instruction
===========================================
   0:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
   5:	0f 85 19 05 00 00    	jne    0x524
   b:	48 89 5d 00          	mov    %rbx,0x0(%rbp)
   f:	48 85 db             	test   %rbx,%rbx
  12:	74 1a                	je     0x2e
  14:	48                   	rex.W
  15:	8d                   	.byte 0x8d
[  821.925096][ T4679] RSP: 0018:ffffc9000107ed70 EFLAGS: 00010202
[  821.925282][ T4679] RAX: 0000000000000002 RBX: ffff888016400808 RCX: 1ffffffff107c7d6
[  821.925496][ T4679] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888009e72808
[  821.925709][ T4679] RBP: 0000000000000011 R08: 0000000000000001 R09: fffffbfff10799cb
[  821.925927][ T4679] R10: ffffffff883cce5f R11: ffffc9000107e981 R12: ffff888009e7293c
[  821.926147][ T4679] R13: dffffc0000000000 R14: ffff888009311000 R15: ffff888009e72800
[  821.926357][ T4679] FS:  00007f22a6218800(0000) GS:ffff888036080000(0000) knlGS:0000000000000000
[  821.926603][ T4679] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  821.926781][ T4679] CR2: 00000000004e28e0 CR3: 0000000009b8c004 CR4: 0000000000772ef0
[  821.926994][ T4679] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  821.927211][ T4679] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  821.927425][ T4679] PKRU: 55555554
[  821.927534][ T4679] Call Trace:
[  821.927641][ T4679]  <TASK>
[ 821.927718][ T4679] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 821.927833][ T4679] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693) 
[ 821.927978][ T4679] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 821.928127][ T4679] ? neigh_flush_dev.isra.0 (./include/linux/list.h:988 ./include/linux/rculist.h:516 net/core/neighbour.c:384) 
[ 821.928267][ T4679] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 821.928411][ T4679] __neigh_ifdown.isra.0 (net/core/neighbour.c:826 net/core/neighbour.c:426) 
[ 821.928552][ T4679] ? __fib6_clean_all (net/ipv6/ip6_fib.c:2274) 
[ 821.928693][ T4679] ? __pfx_fib6_ifdown (net/ipv6/route.c:4853) 
[ 821.928833][ T4679] neigh_ifdown (net/core/neighbour.c:445) 
[ 821.928938][ T4679] rt6_disable_ip (net/ipv6/route.c:4912) 
[ 821.929078][ T4679] ? __pfx_rt6_disable_ip (net/ipv6/route.c:4912) 
[ 821.929218][ T4679] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 821.929366][ T4679] addrconf_ifdown.isra.0 (./include/net/addrconf.h:330 net/ipv6/addrconf.c:3860) 
[ 821.929509][ T4679] ? __try_to_del_timer_sync (kernel/time/timer.c:1499) 
[ 821.929653][ T4679] ? __pfx_addrconf_ifdown.isra.0 (net/ipv6/addrconf.c:3845) 
[ 821.929828][ T4679] addrconf_notify (net/ipv6/addrconf.c:3815) 
[ 821.929970][ T4679] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[ 821.930115][ T4679] dev_close_many (net/core/dev.c:1590) 
[ 821.930257][ T4679] ? __pfx_dev_close_many (net/core/dev.c:1577) 
[ 821.930398][ T4679] ? __debug_check_no_obj_freed (lib/debugobjects.c:1000) 
[ 821.930577][ T4679] unregister_netdevice_many_notify (net/core/dev.c:11503) 
[ 821.930753][ T4679] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 821.930859][ T4679] ? mark_held_locks (kernel/locking/lockdep.c:4321) 
[ 821.930998][ T4679] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11470) 
[ 821.931170][ T4679] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) 
[ 821.931347][ T4679] ? kfree (mm/slub.c:4579 mm/slub.c:4727) 
[ 821.931455][ T4679] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) 
[ 821.931599][ T4679] ? vlan_vid_del (net/8021q/vlan_core.c:368 net/8021q/vlan_core.c:387) 
[ 821.931744][ T4679] rtnl_dellink (net/core/rtnetlink.c:3329 net/core/rtnetlink.c:3379) 
[ 821.931887][ T4679] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 821.932030][ T4679] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3335) 
[ 821.932173][ T4679] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 821.932326][ T4679] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 52)) 
[ 821.932473][ T4679] ? __mutex_lock (./arch/x86/include/asm/preempt.h:94 kernel/locking/mutex.c:618 kernel/locking/mutex.c:752) 
[ 821.932615][ T4679] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 821.932761][ T4679] ? rtnetlink_rcv_msg (net/core/rtnetlink.c:6719) 
[ 821.932904][ T4679] ? __pfx___mutex_lock (kernel/locking/mutex.c:751) 
[ 821.933045][ T4679] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 821.933186][ T4679] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 821.933325][ T4679] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 821.933466][ T4679] rtnetlink_rcv_msg (net/core/rtnetlink.c:6721) 
[ 821.933607][ T4679] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6615) 
[ 821.933745][ T4679] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 821.933888][ T4679] ? mark_lock (kernel/locking/lockdep.c:4703 (discriminator 3)) 
[ 821.934008][ T4679] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 821.934149][ T4679] netlink_rcv_skb (net/netlink/af_netlink.c:2551) 
[ 821.934292][ T4679] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6615) 
[ 821.934433][ T4679] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2528) 
[ 821.934577][ T4679] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 821.934717][ T4679] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 821.934856][ T4679] netlink_unicast (net/netlink/af_netlink.c:1331 net/netlink/af_netlink.c:1357) 
[ 821.935000][ T4679] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1342) 
[ 821.935143][ T4679] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 821.935285][ T4679] netlink_sendmsg (net/netlink/af_netlink.c:1901) 
[ 821.935426][ T4679] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1820) 
[ 821.935567][ T4679] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) 
[ 821.935711][ T4679] ? __import_iovec (lib/iov_iter.c:1433 lib/iov_iter.c:1449) 
[ 821.935855][ T4679] ____sys_sendmsg (net/socket.c:729 net/socket.c:744 net/socket.c:2607) 
[ 821.935996][ T4679] ? __pfx_____sys_sendmsg (net/socket.c:2553) 
[ 821.936134][ T4679] ? __pfx_copy_msghdr_from_user (net/socket.c:2533) 
[ 821.936317][ T4679] ___sys_sendmsg (net/socket.c:2663) 
[ 821.936457][ T4679] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 821.936599][ T4679] ? __pfx____sys_sendmsg (net/socket.c:2650) 
[ 821.936739][ T4679] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) 
[ 821.936881][ T4679] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4609) 
[ 821.937053][ T4679] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 821.937193][ T4679] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 821.937334][ T4679] ? __kasan_record_aux_stack (mm/kasan/generic.c:541) 
[ 821.937482][ T4679] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:123 kernel/rcu/tree.c:3087) 
[ 821.937659][ T4679] ? __x64_sys_close (fs/open.c:1568 fs/open.c:1550 fs/open.c:1550) 
[ 821.937800][ T4679] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 821.937944][ T4679] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 821.938119][ T4679] ? __lock_acquire (kernel/locking/lockdep.c:5202) 
[ 821.938269][ T4679] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 821.938411][ T4679] ? __lock_release (kernel/locking/lockdep.c:5501) 
[ 821.938551][ T4679] ? fdget (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1114 fs/file.c:1128) 
[ 821.938666][ T4679] __sys_sendmsg (./include/linux/file.h:35 net/socket.c:2692) 
[ 821.938808][ T4679] ? __pfx___sys_sendmsg (net/socket.c:2678) 
[ 821.938947][ T4679] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2053 arch/x86/mm/physaddr.c:65) 
[ 821.939095][ T4679] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 821.939238][ T4679] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  821.939412][ T4679] RIP: 0033:0x7f22a64247b7
[ 821.939559][ T4679] 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)
[  821.940061][ T4679] RSP: 002b:00007ffff4540898 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  821.940273][ T4679] RAX: ffffffffffffffda RBX: 00007ffff4540fc0 RCX: 00007f22a64247b7
[  821.940487][ T4679] RDX: 0000000000000000 RSI: 00007ffff4540900 RDI: 0000000000000005
[  821.940697][ T4679] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[  821.940910][ T4679] R10: 00007f22a62e2ef8 R11: 0000000000000246 R12: 0000000000000002


Finger prints:
neigh_ifdown:rt6_disable_ip:addrconf_notify:notifier_call_chain:dev_close_many