kasan: CONFIG_KASAN_INLINE enabled
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: 1 PID: 4221 Comm: syzkaller392644 Not tainted 4.16.0-rc1+ #316
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:sk_dst_get include/net/sock.h:1766 [inline]
RIP: 0010:pppol2tp_session_init net/l2tp/l2tp_ppp.c:596 [inline]
RIP: 0010:pppol2tp_connect+0x10a3/0x1dd0 net/l2tp/l2tp_ppp.c:756
RSP: 0018:ffff8801cc7179a8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801af7bb480 RCX: ffffffff851b4ed0
RDX: 0000000000000045 RSI: 00000000671453b9 RDI: 0000000000000228
RBP: ffff8801cc717c28 R08: 1ffff100398e2e77 R09: 0000000000000002
R10: ffff8801cc717878 R11: 0000000000000000 R12: ffff8801b12badc0
R13: ffff8801cc717c00 R14: 0000000000000000 R15: ffff8801cc717ae0
FS:  00007f29f41b3700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020e71000 CR3: 00000001b6122006 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 SYSC_connect+0x213/0x4a0 net/socket.c:1639
 SyS_connect+0x24/0x30 net/socket.c:1620
 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x44a5b9
RSP: 002b:00007f29f41b2da8 EFLAGS: 00000283 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00000000006e1644 RCX: 000000000044a5b9
RDX: 0000000000000032 RSI: 0000000020e71000 RDI: 0000000000000008
RBP: 00000000006e1640 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000283 R12: 73696c6b63616c62
R13: 6273752f7665642f R14: 81696ccd63616c62 R15: 0000000000000011
Code: fe ff ff e8 00 bd 55 fc 4c 89 fa 49 8d be 28 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 c6 04 02 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 df 09 00 00 4c 89 fa 48 b8 00 00 00 00 00 fc 
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8801cc7179a8
RIP: sk_dst_get include/net/sock.h:1766 [inline] RSP: ffff8801cc7179a8
RIP: pppol2tp_session_init net/l2tp/l2tp_ppp.c:596 [inline] RSP: ffff8801cc7179a8
RIP: pppol2tp_connect+0x10a3/0x1dd0 net/l2tp/l2tp_ppp.c:756 RSP: ffff8801cc7179a8
---[ end trace 37b17041c4e5a00b ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..