l2tp_ppp: sess 59/32096: set debug=f55d40e
l2tp_ppp: sess 59/32096: get L2TP stats
------------[ cut here ]------------
kernel BUG at net/l2tp/l2tp_ppp.c:176!
netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'.
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 6834 Comm: kworker/u4:9 Not tainted 4.15.0-rc8+ #193
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: kkcmd kcm_tx_work
RIP: 0010:pppol2tp_sock_to_session net/l2tp/l2tp_ppp.c:176 [inline]
RIP: 0010:pppol2tp_sendmsg+0x512/0x670 net/l2tp/l2tp_ppp.c:304
RSP: 0018:ffff8801bb637128 EFLAGS: 00010293
RAX: ffff8801d0c906c0 RBX: ffff8801d371d240 RCX: ffffffff8505da82
RDX: 0000000000000000 RSI: ffff8801bb637288 RDI: ffff8801d371d620
RBP: ffff8801bb637198 R08: 0000000000000000 R09: 1ffff100376c6db5
R10: 0000000000000003 R11: 0000000000000003 R12: ffff8801d339b1c0
R13: 0000000000000000 R14: 0000000000000010 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe149957db8 CR3: 0000000006822005 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 kernel_sendmsg+0x47/0x60 net/socket.c:648
 sock_no_sendpage+0x1cc/0x280 net/core/sock.c:2581
 kernel_sendpage+0xbf/0xe0 net/socket.c:3360
 kcm_write_msgs+0x404/0x1b80 net/kcm/kcmsock.c:646
 kcm_tx_work+0x2e/0x190 net/kcm/kcmsock.c:731
 process_one_work+0xbbf/0x1b10 kernel/workqueue.c:2112
 worker_thread+0x223/0x1990 kernel/workqueue.c:2246
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x37/0x50 arch/x86/entry/entry_64.S:530
Code: 15 45 6a fc 48 8b 7d d0 e8 0c c0 55 fd 84 c0 74 0d e8 03 45 6a fc 48 89 df e8 8b bb 2b ff 41 bd f7 ff ff ff eb 86 e8 ee 44 6a fc <0f> 0b 41 bd 95 ff ff ff e9 74 ff ff ff e8 bc 32 a2 fc e9 77 fb 
RIP: pppol2tp_sock_to_session net/l2tp/l2tp_ppp.c:176 [inline] RSP: ffff8801bb637128
RIP: pppol2tp_sendmsg+0x512/0x670 net/l2tp/l2tp_ppp.c:304 RSP: ffff8801bb637128
---[ end trace 36a0a551ea043084 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..