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: 0 PID: 5564 Comm: syzkaller570332 Not tainted 4.15.0-rc9+ #278
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:1764 [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:ffff8801ce747af0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801cdb02e80 RCX: ffffffff8502b130
RDX: 0000000000000045 RSI: 00000000739f239f RDI: 0000000000000228
RBP: ffff8801ce747d70 R08: 1ffff10039ce8e9f R09: 0000000000000002
R10: ffff8801ce7479c0 R11: 0000000000000000 R12: ffff8801cd9bcdc0
R13: ffff8801ce747d48 R14: 0000000000000000 R15: ffff8801ce747c28
FS:  0000000002033880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000205fafd2 CR3: 00000001ce9c3002 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 SYSC_connect+0x213/0x4a0 net/socket.c:1621
 SyS_connect+0x24/0x30 net/socket.c:1602
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x4454d9
RSP: 002b:00007fff91abd668 EFLAGS: 00000203 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00000000004454d9
RDX: 000000000000002e RSI: 00000000205fafd2 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 0000000000007a88
R13: 0000000000402700 R14: 0000000000000000 R15: 0000000000000000
Code: fe ff ff e8 40 7a 6d 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 e5 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: ffff8801ce747af0
RIP: sk_dst_get include/net/sock.h:1764 [inline] RSP: ffff8801ce747af0
RIP: pppol2tp_session_init net/l2tp/l2tp_ppp.c:596 [inline] RSP: ffff8801ce747af0
RIP: pppol2tp_connect+0x10a3/0x1dd0 net/l2tp/l2tp_ppp.c:756 RSP: ffff8801ce747af0
---[ end trace 4610878723add1b7 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..