------------[ cut here ]------------
kernel BUG at net/l2tp/l2tp_ppp.c:176!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 13092 Comm: syz-executor3 Not tainted 4.15.0-rc7+ #181
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:pppol2tp_sock_to_session net/l2tp/l2tp_ppp.c:176 [inline]
RIP: 0010:pppol2tp_setsockopt+0x294/0x7c0 net/l2tp/l2tp_ppp.c:1383
RSP: 0018:ffff8801c77c7e10 EFLAGS: 00010216
RAX: 0000000000010000 RBX: 0000000000000000 RCX: ffffffff84ffcd24
RDX: 000000000000005b RSI: ffffc90002f1c000 RDI: ffff8801cfd39500
RBP: ffff8801c77c7e48 R08: 0000000000000000 R09: 1ffff10038ef8f9e
R10: ffff8801c77c7cb8 R11: 0000000000000000 R12: ffff8801cfd39480
R13: 0000000000000008 R14: ffff8801c9144040 R15: ffff8801cfd39500
FS:  00007f60b6115700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020174000 CR3: 00000001bb3a7001 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 SYSC_setsockopt net/socket.c:1821 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1800
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f60b6114c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452ac9
RDX: 0000000000000008 RSI: 0000000000000111 RDI: 0000000000000013
RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000000
R10: 00000000203b5ffc R11: 0000000000000212 R12: 00000000006ee100
R13: 00000000ffffffff R14: 00007f60b61156d4 R15: 0000000000000008
Code: 4c 89 e7 e8 cf 38 2f ff bb f7 ff ff ff e9 28 ff ff ff bb f2 ff ff ff e9 1e ff ff ff bb ea ff ff ff e9 14 ff ff ff e8 1c 51 70 fc <0f> 0b e8 15 51 70 fc 49 8d be f8 00 00 00 48 b8 00 00 00 00 00 
RIP: pppol2tp_sock_to_session net/l2tp/l2tp_ppp.c:176 [inline] RSP: ffff8801c77c7e10
RIP: pppol2tp_setsockopt+0x294/0x7c0 net/l2tp/l2tp_ppp.c:1383 RSP: ffff8801c77c7e10
---[ end trace 944d61ae2a4ae371 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..