Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.205' (ECDSA) to the list of known hosts.
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syzkaller login: [   32.643887] kasan: CONFIG_KASAN_INLINE enabled
[   32.648552] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   32.657383] general protection fault: 0000 [#1] PREEMPT SMP KASAN
[   32.663629] Modules linked in:
[   32.666923] CPU: 1 PID: 8104 Comm: syz-executor384 Not tainted 4.14.307-syzkaller #0
[   32.674784] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
[   32.684121] task: ffff88809d6b62c0 task.stack: ffff8880b2f10000
[   32.690178] RIP: 0010:pppol2tp_session_init+0x1ca/0x4d0
[   32.695538] RSP: 0018:ffff8880b2f17c50 EFLAGS: 00010202
[   32.700894] RAX: dffffc0000000000 RBX: ffff888095e82940 RCX: 1ffffffff11999ac
[   32.708150] RDX: 0000000000000045 RSI: ffffffff87cd1780 RDI: 0000000000000228
[   32.715402] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020011
[   32.722667] R10: ffff88809d6b6b70 R11: ffff88809d6b62c0 R12: 0000000000001fa8
[   32.730004] R13: 0000000000000002 R14: ffff8880b2e16312 R15: ffff8880b2e16330
[   32.737259] FS:  0000555555d9d300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
[   32.745468] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.751332] CR2: 00007ffcddb0ce78 CR3: 00000000abd76000 CR4: 00000000003406e0
[   32.758687] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.765937] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   32.773276] Call Trace:
[   32.775856]  pppol2tp_connect+0xd5c/0x13d0
[   32.780176]  ? pppol2tp_recv_payload_hook+0x1a0/0x1a0
[   32.785356]  ? lock_acquire+0x170/0x3f0
[   32.789325]  ? lock_downgrade+0x740/0x740
[   32.793462]  ? security_socket_connect+0x83/0xb0
[   32.798201]  ? pppol2tp_recv_payload_hook+0x1a0/0x1a0
[   32.803470]  SyS_connect+0x1f4/0x240
[   32.807165]  ? SyS_accept+0x30/0x30
[   32.810780]  ? up_read+0x17/0x30
[   32.814141]  ? __do_page_fault+0x159/0xad0
[   32.818358]  ? do_syscall_64+0x4c/0x640
[   32.822325]  ? SyS_accept+0x30/0x30
[   32.825948]  do_syscall_64+0x1d5/0x640
[   32.829824]  entry_SYSCALL_64_after_hwframe+0x5e/0xd3
[   32.835000] RIP: 0033:0x7f4acd498da9
[   32.838695] RSP: 002b:00007ffcddb0ce98 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
[   32.846386] RAX: ffffffffffffffda RBX: 0000000000007f9a RCX: 00007f4acd498da9
[   32.853651] RDX: 000000000000002e RSI: 0000000020000040 RDI: 0000000000000003
[   32.860914] RBP: 0000000000000000 R08: 00007ffcddb0d038 R09: 00007ffcddb0d038
[   32.868163] R10: 00007ffcddb0d038 R11: 0000000000000246 R12: 00007ffcddb0ceac
[   32.875420] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
[   32.882675] Code: fa 80 3d 06 72 6c 03 00 0f 84 25 02 00 00 e8 3e 59 ce fa 48 8d bd 28 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 db 02 00 00 48 8b ad 28 02 00 00 e8 20 36 bf 
[   32.901915] RIP: pppol2tp_session_init+0x1ca/0x4d0 RSP: ffff8880b2f17c50
[   32.909235] ---[ end trace 848379473408bd4d ]---
[   32.914032] Kernel panic - not syncing: Fatal exception
[   32.919635] Kernel Offset: disabled
[   32.923268] Rebooting in 86400 seconds..