[ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 26.424328] kasan: CONFIG_KASAN_INLINE enabled [ 26.434846] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.450343] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.456581] Modules linked in: [ 26.459767] CPU: 0 PID: 8176 Comm: syz-executor279 Not tainted 4.14.300-syzkaller #0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 26.467630] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 26.476973] task: ffff8880954965c0 task.stack: ffff888096f40000 [ 26.483049] RIP: 0010:pppol2tp_session_init+0x1ca/0x4d0 [ 26.488400] RSP: 0018:ffff888096f47c50 EFLAGS: 00010202 [ 26.493748] RAX: dffffc0000000000 RBX: ffff888098e8b6c0 RCX: 1ffffffff11995ac [ 26.501007] RDX: 0000000000000045 RSI: ffffffff87cd1180 RDI: 0000000000000228 [ 26.508269] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020011 [ 26.515533] R10: ffff888095496e70 R11: ffff8880954965c0 R12: 0000000000001ff0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 26.522789] R13: 0000000000000002 R14: ffff8880b1899692 R15: ffff8880b18996b0 [ 26.530054] FS: 0000555555674300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 26.538269] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.544143] CR2: 0000000020000000 CR3: 00000000a104f000 CR4: 00000000003406f0 [ 26.551408] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.558666] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.565919] Call Trace: [ 26.568501] pppol2tp_connect+0xd5c/0x13d0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 26.572730] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 26.577907] ? lock_acquire+0x170/0x3f0 [ 26.581878] ? lock_downgrade+0x740/0x740 [ 26.586024] ? security_socket_connect+0x83/0xb0 [ 26.590774] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 26.596058] SyS_connect+0x1f4/0x240 [ 26.599764] ? SyS_accept+0x30/0x30 [ 26.603470] ? up_read+0x17/0x30 [ 26.606826] ? __do_page_fault+0x159/0xad0 [ 26.611055] ? do_syscall_64+0x4c/0x640 [ 26.615015] ? SyS_accept+0x30/0x30 [ 26.618633] do_syscall_64+0x1d5/0x640 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 26.622513] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 26.627687] Code: fa 80 3d 65 9d 6c 03 00 0f 84 25 02 00 00 e8 1e 94 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 c0 6d bf [ 26.646831] RIP: pppol2tp_session_init+0x1ca/0x4d0 RSP: ffff888096f47c50 executing program executing program executing program [ 26.671378] ---[ end trace bc2dcf85452e7e9f ]--- [ 26.676140] Kernel panic - not syncing: Fatal exception [ 26.681638] Kernel Offset: disabled [ 26.685244] Rebooting in 86400 seconds..