------------[ 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: 20222 Comm: syz-executor2 Not tainted 4.15.0-rc9+ #206
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_ioctl+0x582/0x730 net/l2tp/l2tp_ppp.c:1229
RSP: 0018:ffff8801bf827bd8 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffff8801a6bee900 RCX: ffffffff8506f632
RDX: 000000000000005f RSI: ffffc90003b3f000 RDI: ffff8801a6bee980
RBP: ffff8801bf827cc8 R08: 1ffff10037f04f5e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10037f04f80
R13: ffff8801bf906880 R14: ffff8801bf827ca0 R15: ffffffff8506f0b0
FS:  00007fbedae62700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b9bc21000 CR3: 00000001c2c6f004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 pppox_ioctl+0x1c7/0x250 drivers/net/ppp/pppox.c:97
 sock_do_ioctl+0x65/0xb0 net/socket.c:958
 sock_ioctl+0x2c2/0x440 net/socket.c:1055
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007fbedae61c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452f19
RDX: 0000000020a27ff4 RSI: 00000000400443c9 RDI: 0000000000000015
RBP: 000000000000038e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f45f0
R13: 00000000ffffffff R14: 00007fbedae626d4 R15: 0000000000000000
Code: 00 89 85 30 ff ff ff e8 cd ce 54 fd 84 c0 0f 84 a1 fe ff ff e8 c0 3d 69 fc 4c 89 f7 e8 68 1c ff ff e9 8f fe ff ff e8 ae 3d 69 fc <0f> 0b e8 a7 3d 69 fc 48 8b bd 20 ff ff ff e8 9b ce 54 fd 84 c0 
RIP: pppol2tp_sock_to_session net/l2tp/l2tp_ppp.c:176 [inline] RSP: ffff8801bf827bd8
RIP: pppol2tp_ioctl+0x582/0x730 net/l2tp/l2tp_ppp.c:1229 RSP: ffff8801bf827bd8
---[ end trace 83dde9a09b9d235a ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..