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: 4248 Comm: syzkaller192691 Not tainted 4.16.0-rc2+ #233
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:ffff8801b14f7958 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801b17e0880 RCX: ffffffff851b65c0
RDX: 0000000000000045 RSI: 00000000154c0643 RDI: 0000000000000228
RBP: ffff8801b14f7bd8 R08: 1ffff1003629ee6d R09: 0000000000000002
R10: ffff8801b14f7828 R11: 0000000000000000 R12: ffff8801b1bb44c0
R13: ffff8801b14f7bb0 R14: 0000000000000000 R15: ffff8801b14f7a90
FS:  0000000000000000(0000) GS:ffff8801db400000(0063) knlGS:0000000008ea8840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020000000 CR3: 00000001b175a005 CR4: 00000000001606f0
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_32_irqs_on arch/x86/entry/common.c:330 [inline]
 do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f6dc79
RSP: 002b:00000000ff9caf5c EFLAGS: 00000286 ORIG_RAX: 000000000000016a
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000000
RDX: 000000000000002e RSI: 0000000000000003 RDI: 0000000001000000
RBP: 000000000806f376 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: fe ff ff e8 10 a6 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: ffff8801b14f7958
RIP: sk_dst_get include/net/sock.h:1766 [inline] RSP: ffff8801b14f7958
RIP: pppol2tp_session_init net/l2tp/l2tp_ppp.c:596 [inline] RSP: ffff8801b14f7958
RIP: pppol2tp_connect+0x10a3/0x1dd0 net/l2tp/l2tp_ppp.c:756 RSP: ffff8801b14f7958
---[ end trace aa028ebce04c2bd9 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..