------------[ cut here ]------------
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
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: 12845 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #203
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:ffff8801cdb1fe10 EFLAGS: 00010216
RAX: 0000000000010000 RBX: 0000000000000000 RCX: ffffffff8506c6d4
RDX: 000000000000005b RSI: ffffc900044d2000 RDI: ffff8801d4a80a80
RBP: ffff8801cdb1fe48 R08: 0000000000000000 R09: 1ffff10039b63f9e
R10: ffff8801cdb1fcb8 R11: 0000000000000000 R12: ffff8801d4a80a00
R13: 0000000000000004 R14: ffff8801d0597c40 R15: ffff8801d4a80a80
FS:  00007fc6070e1700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020fd5000 CR3: 00000001cbb9e004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 SYSC_setsockopt net/socket.c:1823 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1802
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452ef9
RSP: 002b:00007fc6070e0c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ef9
RDX: 0000000000000004 RSI: 0000000000000111 RDI: 0000000000000013
RBP: 00000000000004a7 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000020fd5000 R11: 0000000000000212 R12: 00000000006f6048
R13: 00000000ffffffff R14: 00007fc6070e16d4 R15: 0000000000000000
Code: 4c 89 e7 e8 4f 4f 2b 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 3c 6c 69 fc <0f> 0b e8 35 6c 69 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: ffff8801cdb1fe10
RIP: pppol2tp_setsockopt+0x294/0x7c0 net/l2tp/l2tp_ppp.c:1383 RSP: ffff8801cdb1fe10
---[ end trace 42f7dc111819ea6a ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..