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: 4823 Comm: syzkaller716101 Not tainted 4.15.0+ #218
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:ffff8801b8d67958 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801b85362c0 RCX: ffffffff851b2ed0
RDX: 0000000000000045 RSI: 000000004e906c70 RDI: 0000000000000228
RBP: ffff8801b8d67bd8 R08: 1ffff100371ace6d R09: 0000000000000002
R10: ffff8801b8d67828 R11: 0000000000000000 R12: ffff8801b742c4c0
R13: ffff8801b8d67bb0 R14: 0000000000000000 R15: ffff8801b8d67a90
FS:  0000000000000000(0000) GS:ffff8801db400000(0063) knlGS:0000000008fb9900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002014cfd2 CR3: 00000001b707e005 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+0x3ee/0xfa1 arch/x86/entry/common.c:392
 entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:129
RIP: 0023:0xf7fe2c79
RSP: 002b:000000000820f6fc EFLAGS: 00000246 ORIG_RAX: 000000000000016a
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000002014cfd2
RDX: 000000000000002e RSI: 000000000820fe8c RDI: 000000000820fe8c
RBP: 00000000000002dd R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: fe ff ff e8 80 ce 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: ffff8801b8d67958
RIP: sk_dst_get include/net/sock.h:1766 [inline] RSP: ffff8801b8d67958
RIP: pppol2tp_session_init net/l2tp/l2tp_ppp.c:596 [inline] RSP: ffff8801b8d67958
RIP: pppol2tp_connect+0x10a3/0x1dd0 net/l2tp/l2tp_ppp.c:756 RSP: ffff8801b8d67958
---[ end trace 51261805b8eeeb50 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..