kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 8336 Comm: syz-executor.5 Not tainted 4.14.155-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880854a22c0 task.stack: ffff888051640000
RIP: 0010:__write_once_size include/linux/compiler.h:210 [inline]
RIP: 0010:__skb_unlink include/linux/skbuff.h:1886 [inline]
RIP: 0010:skb_unlink+0xc4/0x160 net/core/skbuff.c:2942
RSP: 0018:ffff8880516479b0 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffff88807af13780 RCX: 0000000016a7ad40
RDX: 0000000000000001 RSI: 0000000000000282 RDI: 0000000000000008
RBP: ffff8880516479d8 R08: 0000000000006ab6 R09: ffffffff88cb9b70
R10: ffff8880854a2b68 R11: ffff8880854a22c0 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888056a947e0 R15: ffff888051647a58
FS:  00007fcc076da700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000076cb3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kcm_recvmsg+0x3a2/0x480 net/kcm/kcmsock.c:1160
 sock_recvmsg_nosec+0x89/0xb0 net/socket.c:819
 ___sys_recvmsg+0x21f/0x4d0 net/socket.c:2221
 __sys_recvmmsg+0x226/0x6b0 net/socket.c:2329
 SYSC_recvmmsg net/socket.c:2405 [inline]
 SyS_recvmmsg+0x125/0x140 net/socket.c:2394
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45a639
RSP: 002b:00007fcc076d9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a639
RDX: 0400000000000310 RSI: 0000000020003540 RDI: 0000000000000008
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcc076da6d4
R13: 00000000004c82f0 R14: 00000000004de6e0 R15: 00000000ffffffff
Code: 00 00 00 49 8d 7d 08 4c 8b 63 08 48 b8 00 00 00 00 00 fc ff df 48 c7 43 08 00 00 00 00 48 89 fa 48 c7 03 00 00 00 00 48 c1 ea 03 <80> 3c 02 00 75 58 4c 89 e2 4d 89 65 08 48 b8 00 00 00 00 00 fc 
RIP: __write_once_size include/linux/compiler.h:210 [inline] RSP: ffff8880516479b0
RIP: __skb_unlink include/linux/skbuff.h:1886 [inline] RSP: ffff8880516479b0
RIP: skb_unlink+0xc4/0x160 net/core/skbuff.c:2942 RSP: ffff8880516479b0
---[ end trace e1a93ac7a4da0621 ]---