======================================
| [  226.319024][   T71] vx0: left promiscuous mode
| [  226.319353][   T71] br0: port 1(vx0) entered disabled state
| [  226.343050][   T52] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN
| [  226.343252][   T52] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
[  226.343514][   T52] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  226.343625][   T52] Workqueue: mld mld_ifc_work
[  226.343712][   T52] RIP: 0010:mroute6_is_socket (net/ipv6/ip6mr.c:1686 (discriminator 4))
[  226.343794][   T52] Code: df 48 89 f9 48 c1 e9 03 80 3c 11 00 75 2f 48 8b 80 e8 10 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d 78 30 48 89 f9 48 c1 e9 03 <80> 3c 11 00 75 1c 48 83 78 30 00 0f 95 c0 48 83 c4 08 c3 48 89 04
All code
========
   0:	df 48 89             	fisttps -0x77(%rax)
   3:	f9                   	stc
   4:	48 c1 e9 03          	shr    $0x3,%rcx
   8:	80 3c 11 00          	cmpb   $0x0,(%rcx,%rdx,1)
   c:	75 2f                	jne    0x3d
   e:	48 8b 80 e8 10 00 00 	mov    0x10e8(%rax),%rax
  15:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  1c:	fc ff df 
  1f:	48 8d 78 30          	lea    0x30(%rax),%rdi
  23:	48 89 f9             	mov    %rdi,%rcx
  26:	48 c1 e9 03          	shr    $0x3,%rcx
  2a:*	80 3c 11 00          	cmpb   $0x0,(%rcx,%rdx,1)		<-- trapping instruction
  2e:	75 1c                	jne    0x4c
  30:	48 83 78 30 00       	cmpq   $0x0,0x30(%rax)
  35:	0f 95 c0             	setne  %al
  38:	48 83 c4 08          	add    $0x8,%rsp
  3c:	c3                   	ret
  3d:	48                   	rex.W
  3e:	89                   	.byte 0x89
  3f:	04                   	.byte 0x4

Code starting with the faulting instruction
===========================================
   0:	80 3c 11 00          	cmpb   $0x0,(%rcx,%rdx,1)
   4:	75 1c                	jne    0x22
   6:	48 83 78 30 00       	cmpq   $0x0,0x30(%rax)
   b:	0f 95 c0             	setne  %al
   e:	48 83 c4 08          	add    $0x8,%rsp
  12:	c3                   	ret
  13:	48                   	rex.W
  14:	89                   	.byte 0x89
  15:	04                   	.byte 0x4
[  226.344067][   T52] RSP: 0018:ffa000000038f8b0 EFLAGS: 00010216
[  226.344163][   T52] RAX: 0000000000000000 RBX: ff110000051531c0 RCX: 0000000000000006
[  226.344276][   T52] RDX: dffffc0000000000 RSI: ff110000051531c0 RDI: 0000000000000030
[  226.344392][   T52] RBP: ff11000012b15540 R08: ffffffff9abb8550 R09: 1fe2200001c94935
[  226.344507][   T52] R10: ff1100000e78a028 R11: ff110000152d20b0 R12: 1ff4000000071f20
[  226.344629][   T52] R13: ff110000152d2000 R14: ff11000014bf5000 R15: ff1100000e78a010
[  226.344753][   T52] FS:  0000000000000000(0000) GS:ff110000ce564000(0000) knlGS:0000000000000000
[  226.344890][   T52] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  226.344989][   T52] CR2: 00007f22a318f8f4 CR3: 000000004a94f001 CR4: 0000000000771ef0
[  226.345104][   T52] PKRU: 55555554
[  226.345162][   T52] Call Trace:
[  226.345223][   T52]  <TASK>
[  226.345265][   T52]  ip6_finish_output2 (net/ipv6/ip6_output.c:84 (discriminator 3))
[  226.345344][   T52]  ? ip6_xmit (net/ipv6/ip6_output.c:61)
[  226.345420][   T52]  ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))
[  226.345498][   T52]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5536)
[  226.345581][   T52]  ? ip6_mtu (./include/linux/rcupdate.h:322 (discriminator 2) ./include/linux/rcupdate.h:881 (discriminator 2) ./include/net/ip6_route.h:382 (discriminator 2) net/ipv6/route.c:3281 (discriminator 2))
[  226.345651][   T52]  ip6_finish_output (net/ipv6/ip6_output.c:208 net/ipv6/ip6_output.c:219)
[  226.345729][   T52]  ip6_output (./include/linux/netfilter.h:307 net/ipv6/ip6_output.c:246)
[  226.345787][   T52]  ? ip6_finish_output (net/ipv6/ip6_output.c:227)
[  226.345869][   T52]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5536)
[  226.345946][   T52]  ? xfrm_bundle_lookup.constprop.0 (net/xfrm/xfrm_policy.c:3177)
[  226.346042][   T52]  ? mark_held_locks (kernel/locking/lockdep.c:4325 (discriminator 1))
[  226.346120][   T52]  ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:455)
[  226.346199][   T52]  ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:455)
[  226.346275][   T52]  ? icmp6_dst_alloc (net/ipv6/route.c:3357 (discriminator 1))
[  226.346351][   T52]  mld_sendpack (./include/linux/netfilter.h:319 ./include/linux/netfilter.h:312 net/ipv6/mcast.c:1855)
[  226.346426][   T52]  ? nf_hook.constprop.0 (net/ipv4/ip_forward.c:66)
[  226.346503][   T52]  ? mld_send_cr (net/ipv6/mcast.c:2131 (discriminator 14))
[  226.346585][   T52]  mld_ifc_work (net/ipv6/mcast.c:2695)
[  226.346669][   T52]  ? process_one_work (kernel/workqueue.c:3252 (discriminator 2))
[  226.346748][   T52]  process_one_work (kernel/workqueue.c:3281)
[  226.346827][   T52]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:3177)
[  226.346904][   T52]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[  226.346981][   T52]  worker_thread (kernel/workqueue.c:3353 (discriminator 5) kernel/workqueue.c:3440 (discriminator 5))
[  226.347057][   T52]  ? rescuer_thread (kernel/workqueue.c:3386)
[  226.347135][   T52]  ? __kthread_parkme (./arch/x86/include/asm/bitops.h:202 (discriminator 1) ./arch/x86/include/asm/bitops.h:232 (discriminator 1) ./include/asm-generic/bitops/instrumented-non-atomic.h:142 (discriminator 1) kernel/kthread.c:272 (discriminator 1))
[  226.347210][   T52]  ? rescuer_thread (kernel/workqueue.c:3386)
[  226.347283][   T52]  kthread (kernel/kthread.c:436)
[  226.347342][   T52]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 24))
[  226.347437][   T52]  ? kthread_affine_node (kernel/kthread.c:381)
[  226.347517][   T52]  ret_from_fork (arch/x86/kernel/process.c:164)
[  226.347599][   T52]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[  226.347699][   T52]  ? __switch_to (./arch/x86/include/asm/cpufeature.h:101 (discriminator 1) arch/x86/kernel/process_64.c:377 (discriminator 1) arch/x86/kernel/process_64.c:665 (discriminator 1))
[  226.347774][   T52]  ? kthread_affine_node (kernel/kthread.c:381)


Finger prints:
mroute6_is_socket:ip6_finish_output2:ip6_finish_output:ip6_output:mld_sendpack