======================================
| [  843.360572][T12610] ping (12610) used greatest stack depth: 23216 bytes left
| [  853.277266][T12929] ip6_gre: GRE over IPv6 tunneling driver
| [  857.648411][   T63] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN
| [  857.648639][   T63] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
[  857.648903][   T63] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  857.649006][   T63] Workqueue: mld mld_ifc_work
[  857.649090][   T63] RIP: 0010:mroute6_is_socket (net/ipv6/ip6mr.c:1686 (discriminator 4))
[  857.649172][   T63] 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
[  857.649439][   T63] RSP: 0018:ffa00000004478b0 EFLAGS: 00010216
[  857.649533][   T63] RAX: 0000000000000000 RBX: ff1100000e2ae200 RCX: 0000000000000006
[  857.649645][   T63] RDX: dffffc0000000000 RSI: ff1100000e2ae200 RDI: 0000000000000030
[  857.649755][   T63] RBP: ff110000077d0900 R08: ffffffffa63b8550 R09: 1fe2200002937e85
[  857.649863][   T63] R10: ff11000010736898 R11: ff11000008ab40b0 R12: 1ff4000000088f20
[  857.649974][   T63] R13: ff11000008ab4000 R14: ff11000008c78800 R15: ff11000010736880
[  857.650083][   T63] FS:  0000000000000000(0000) GS:ff110000c2de4000(0000) knlGS:0000000000000000
[  857.650213][   T63] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  857.650307][   T63] CR2: 00007f1dc25d2574 CR3: 000000001c74f002 CR4: 0000000000771ef0
[  857.650421][   T63] PKRU: 55555554
[  857.650480][   T63] Call Trace:
[  857.650536][   T63]  <TASK>
[  857.650575][   T63]  ip6_finish_output2 (net/ipv6/ip6_output.c:84 (discriminator 3))
[  857.650653][   T63]  ? ip6_xmit (net/ipv6/ip6_output.c:61)
[  857.650724][   T63]  ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1))
[  857.650800][   T63]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5536)
[  857.650873][   T63]  ? 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))
[  857.650929][   T63]  ip6_finish_output (net/ipv6/ip6_output.c:208 net/ipv6/ip6_output.c:219)
[  857.651002][   T63]  ip6_output (./include/linux/netfilter.h:307 net/ipv6/ip6_output.c:246)
[  857.651056][   T63]  ? ip6_finish_output (net/ipv6/ip6_output.c:227)
[  857.651128][   T63]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5536)
[  857.651201][   T63]  ? xfrm_bundle_lookup.constprop.0 (net/xfrm/xfrm_policy.c:3177)
[  857.651296][   T63]  ? mark_held_locks (kernel/locking/lockdep.c:4325 (discriminator 1))
[  857.651369][   T63]  ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:455)
[  857.651443][   T63]  ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:455)
[  857.651516][   T63]  ? icmp6_dst_alloc (net/ipv6/route.c:3357 (discriminator 1))
[  857.651589][   T63]  mld_sendpack (./include/linux/netfilter.h:319 ./include/linux/netfilter.h:312 net/ipv6/mcast.c:1855)
[  857.651661][   T63]  ? nf_hook.constprop.0 (net/ipv4/ip_forward.c:66)
[  857.651734][   T63]  ? mld_send_cr (net/ipv6/mcast.c:2131 (discriminator 14))
[  857.651808][   T63]  mld_ifc_work (net/ipv6/mcast.c:2695)
[  857.651880][   T63]  ? process_one_work (kernel/workqueue.c:3252 (discriminator 2))
[  857.651954][   T63]  process_one_work (kernel/workqueue.c:3281)
[  857.652028][   T63]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:3177)
[  857.652100][   T63]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:5870 (discriminator 2))
[  857.652172][   T63]  worker_thread (kernel/workqueue.c:3353 (discriminator 5) kernel/workqueue.c:3440 (discriminator 5))
[  857.652244][   T63]  ? rescuer_thread (kernel/workqueue.c:3386)
[  857.652318][   T63]  ? __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))
[  857.652391][   T63]  ? rescuer_thread (kernel/workqueue.c:3386)
[  857.652495][   T63]  kthread (kernel/kthread.c:436)
[  857.652550][   T63]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 24))
[  857.652641][   T63]  ? kthread_affine_node (kernel/kthread.c:381)
[  857.652714][   T63]  ret_from_fork (arch/x86/kernel/process.c:164)
[  857.652787][   T63]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[  857.652877][   T63]  ? __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))
[  857.652952][   T63]  ? kthread_affine_node (kernel/kthread.c:381)


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