[ 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 '10.128.0.140' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 36.842370] kasan: CONFIG_KASAN_INLINE enabled [ 36.847011] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 36.854898] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 36.861116] Modules linked in: [ 36.864283] CPU: 0 PID: 8576 Comm: syz-executor146 Not tainted 4.14.300-syzkaller #0 [ 36.872133] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 36.881458] task: ffff8880afb101c0 task.stack: ffff8880b02e0000 [ 36.887493] RIP: 0010:pppol2tp_session_init+0x1ca/0x4d0 [ 36.892829] RSP: 0018:ffff8880b02e7c50 EFLAGS: 00010202 [ 36.898170] RAX: dffffc0000000000 RBX: ffff8880af63db00 RCX: 1ffffffff11995ac [ 36.905412] RDX: 0000000000000045 RSI: ffffffff87cd1180 RDI: 0000000000000228 [ 36.912652] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020011 [ 36.919894] R10: ffff8880afb10a70 R11: ffff8880afb101c0 R12: 0000000000002180 [ 36.927136] R13: 0000000000000002 R14: ffff8880afa98d92 R15: ffff8880afa98db0 [ 36.934377] FS: 0000555555fb3300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 36.942584] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.948447] CR2: 00000000200000c0 CR3: 00000000b4a63000 CR4: 00000000003406f0 [ 36.955690] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.962932] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.970174] Call Trace: [ 36.972736] pppol2tp_connect+0xd5c/0x13d0 [ 36.976944] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 36.982107] ? lock_acquire+0x170/0x3f0 [ 36.986052] ? lock_downgrade+0x740/0x740 [ 36.990176] ? security_socket_connect+0x83/0xb0 [ 36.994902] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 37.000063] SyS_connect+0x1f4/0x240 [ 37.003748] ? SyS_accept+0x30/0x30 [ 37.007352] ? up_read+0x17/0x30 [ 37.010695] ? __do_page_fault+0x159/0xad0 [ 37.014902] ? do_syscall_64+0x4c/0x640 [ 37.018851] ? SyS_accept+0x30/0x30 [ 37.022448] do_syscall_64+0x1d5/0x640 [ 37.026309] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 37.031471] 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 [ 37.050626] RIP: pppol2tp_session_init+0x1ca/0x4d0 RSP: ffff8880b02e7c50 [ 37.057673] ---[ end trace f04e53ec3b0f081e ]--- [ 37.062454] Kernel panic - not syncing: Fatal exception [ 37.067972] Kernel Offset: disabled [ 37.071576] Rebooting in 86400 seconds..