skbuff: skb_over_panic: text:ffffffff863ac7ef len:40 put:40 head:ffff888093c5ae80 data:ffff888093c5dc70 tail:0x2e18 end:0xec0 dev:ip6gretap0
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:104!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 3626 Comm: kworker/0:2 Not tainted 4.14.222-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
task: ffff8880a8ed63c0 task.stack: ffff8880a8ed8000
RIP: 0010:skb_panic+0x172/0x174 net/core/skbuff.c:104
RSP: 0000:ffff8880a8edf8d0 EFLAGS: 00010282
RAX: 000000000000008c RBX: ffff8880b4929700 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff878bbb40 RDI: ffffed10151dbf10
RBP: ffffffff885554a0 R08: 000000000000008c R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff863ac7ef
R13: 0000000000000028 R14: ffff88809565c200 R15: 0000000000000ec0
FS:  0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000097e9f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 skb_over_panic net/core/skbuff.c:109 [inline]
 skb_put.cold+0x24/0x24 net/core/skbuff.c:1708
 ip6_mc_hdr.constprop.0+0x11f/0x580 net/ipv6/mcast.c:1552
 mld_newpack+0x3aa/0x720 net/ipv6/mcast.c:1603
 add_grhead+0x265/0x330 net/ipv6/mcast.c:1691
 add_grec+0xc40/0xed0 net/ipv6/mcast.c:1822
 mld_send_initial_cr.part.0+0xb0/0x140 net/ipv6/mcast.c:2072
 mld_send_initial_cr net/ipv6/mcast.c:1170 [inline]
 ipv6_mc_dad_complete+0x183/0x5a0 net/ipv6/mcast.c:2084
 addrconf_dad_completed+0x80f/0xa40 net/ipv6/addrconf.c:4061
 addrconf_dad_work+0x5f2/0xef0 net/ipv6/addrconf.c:3992
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 8b 4c 24 10 8b 8b 80 00 00 00 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 40 4d 55 88 ff 74 24 10 ff 74 24 20 e8 b3 72 e4 ff <0f> 0b e8 88 15 3a fa 4c 8b 64 24 18 e8 8e 79 63 fa 48 c7 c1 60 
RIP: skb_panic+0x172/0x174 net/core/skbuff.c:104 RSP: ffff8880a8edf8d0
---[ end trace 07d948e7fcd3b9da ]---