syzbot

kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 2915 Comm: syzkaller686441 Not tainted 4.13.0-rc4+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d1f92500 task.stack: ffff8801d26c0000
RIP: 0010:__skb_flow_dissect+0xdcd/0x3ae0 net/core/flow_dissector.c:445
RSP: 0018:ffff8801d26c7340 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000060 RSI: ffffffff85705c60 RDI: 0000000000000300
RBP: ffff8801d26c7870 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000008 R11: ffffed003a4d8f1e R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff85705c60 R15: ffff8801d3b50d40
FS:  00000000012cc880(0000) GS:ffff8801dc000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020017ff6 CR3: 00000001d436c000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 skb_flow_dissect_flow_keys include/linux/skbuff.h:1176 [inline]
 skb_get_poff+0x9a/0x1a0 net/core/flow_dissector.c:1079
 ______skb_get_pay_offset net/core/filter.c:114 [inline]
 __skb_get_pay_offset+0x15/0x20 net/core/filter.c:112
Code: 80 3c 02 00 44 89 6d 10 0f 85 0c 2a 00 00 4d 8b 67 20 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 00 03 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 db 29 00 00 4d 8b a4 24 00 03 00 00 4d 85 e4 
RIP: __skb_flow_dissect+0xdcd/0x3ae0 net/core/flow_dissector.c:445 RSP: ffff8801d26c7340
---[ end trace 72365ac32c8dd80c ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..