------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:2274!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 2 UID: 0 PID: 61 Comm: kworker/u32:3 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 04/01/2014
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:pskb_expand_head+0x97c/0xf60 net/core/skbuff.c:2274
Code: f8 48 8b 34 24 44 89 e7 e8 61 ac fe ff e8 0c 1f c2 f8 be 01 00 00 00 48 89 df e8 7f ef ff ff e9 4f fa ff ff e8 f5 1e c2 f8 90 <0f> 0b e8 ed 1e c2 f8 90 0f 0b e8 e5 1e c2 f8 48 89 df e8 6d af fe
RSP: 0018:ffffc90000aef470 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888056e5be00 RCX: ffffffff8944d3b8
RDX: ffff8880228524c0 RSI: ffffffff8944dc6b RDI: ffff8880228524c0
RBP: 0000000095f19250 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000095f190d0 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000820 R14: 0000000095f190d0 R15: ffff888056e5becc
FS:  0000000000000000(0000) GS:ffff8880d67db000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c43a685 CR3: 000000000e392000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ipgre_header+0xdd/0x540 net/ipv4/ip_gre.c:900
 dev_hard_header include/linux/netdevice.h:3436 [inline]
 neigh_connected_output+0x34d/0x5d0 net/core/neighbour.c:1618
 neigh_output include/net/neighbour.h:556 [inline]
 ip6_finish_output2+0xb0f/0x1cd0 net/ipv6/ip6_output.c:136
 __ip6_finish_output+0x3cd/0x10d0 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+0x2aa/0xa60 net/ipv6/ip6_output.c:247
 dst_output include/net/dst.h:464 [inline]
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ndisc_send_skb+0xa84/0x1ef0 net/ipv6/ndisc.c:512
 ndisc_send_rs+0x129/0x680 net/ipv6/ndisc.c:722
 addrconf_dad_completed+0x47f/0xff0 net/ipv6/addrconf.c:4360
 addrconf_dad_begin net/ipv6/addrconf.c:4122 [inline]
 addrconf_dad_work+0xb1e/0x1360 net/ipv6/addrconf.c:4227
 process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3421
 kthread+0x3b3/0x730 kernel/kthread.c:463
 ret_from_fork+0x754/0xaf0 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+0x97c/0xf60 net/core/skbuff.c:2274
Code: f8 48 8b 34 24 44 89 e7 e8 61 ac fe ff e8 0c 1f c2 f8 be 01 00 00 00 48 89 df e8 7f ef ff ff e9 4f fa ff ff e8 f5 1e c2 f8 90 <0f> 0b e8 ed 1e c2 f8 90 0f 0b e8 e5 1e c2 f8 48 89 df e8 6d af fe
RSP: 0018:ffffc90000aef470 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888056e5be00 RCX: ffffffff8944d3b8
RDX: ffff8880228524c0 RSI: ffffffff8944dc6b RDI: ffff8880228524c0
RBP: 0000000095f19250 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000095f190d0 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000820 R14: 0000000095f190d0 R15: ffff888056e5becc
FS:  0000000000000000(0000) GS:ffff8880d67db000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1ce5e8600 CR3: 000000002d5a9000 CR4: 0000000000352ef0