------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:2273!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 6619 Comm: kworker/0:5 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: mld mld_ifc_work
RIP: 0010:pskb_expand_head+0x62d/0xf80 net/core/skbuff.c:2273
Code: b6 04 02 84 c0 74 08 3c 03 0f 8e af 08 00 00 8b 44 24 28 8b 74 24 2c 29 f0 01 83 e0 00 00 00 e9 72 ff ff ff e8 14 56 7e f8 90 <0f> 0b e8 0c 56 7e f8 90 0f 0b e8 04 56 7e f8 41 81 cd 00 00 02 00
RSP: 0018:ffffc9000710f6f8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888054cac000 RCX: ffffffff8940a415
RDX: ffff8880227ec980 RSI: ffffffff8940a97c RDI: 0000000000000005
RBP: ffff888054cac0cc R08: 0000000000000005 R09: 0000000000000000
R10: 0000000095c03190 R11: ffff8880227ed4b0 R12: 0000000095c03190
R13: 0000000000000820 R14: 0000000095c03850 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880d68f1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c392741 CR3: 000000005f1e8000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ipgre_header+0xdc/0x610 net/ipv4/ip_gre.c:900
 dev_hard_header include/linux/netdevice.h:3436 [inline]
 neigh_connected_output+0x366/0x620 net/core/neighbour.c:1618
 neigh_output include/net/neighbour.h:556 [inline]
 ip6_finish_output2+0xad1/0x1cf0 net/ipv6/ip6_output.c:136
 __ip6_finish_output+0x3cd/0x1010 net/ipv6/ip6_output.c:209
 ip6_finish_output net/ipv6/ip6_output.c:220 [inline]
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip6_output+0x253/0x710 net/ipv6/ip6_output.c:247
 dst_output+0xa8/0x4b0 include/net/dst.h:464
 NF_HOOK include/linux/netfilter.h:318 [inline]
 NF_HOOK include/linux/netfilter.h:312 [inline]
 mld_sendpack+0xa30/0xed0 net/ipv6/mcast.c:1855
 mld_send_cr net/ipv6/mcast.c:2154 [inline]
 mld_ifc_work+0x740/0xbf0 net/ipv6/mcast.c:2693
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:pskb_expand_head+0x62d/0xf80 net/core/skbuff.c:2273
Code: b6 04 02 84 c0 74 08 3c 03 0f 8e af 08 00 00 8b 44 24 28 8b 74 24 2c 29 f0 01 83 e0 00 00 00 e9 72 ff ff ff e8 14 56 7e f8 90 <0f> 0b e8 0c 56 7e f8 90 0f 0b e8 04 56 7e f8 41 81 cd 00 00 02 00
RSP: 0018:ffffc9000710f6f8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888054cac000 RCX: ffffffff8940a415
RDX: ffff8880227ec980 RSI: ffffffff8940a97c RDI: 0000000000000005
RBP: ffff888054cac0cc R08: 0000000000000005 R09: 0000000000000000
R10: 0000000095c03190 R11: ffff8880227ed4b0 R12: 0000000095c03190
R13: 0000000000000820 R14: 0000000095c03850 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880d68f1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c392741 CR3: 000000000e184000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400