[ OK ] Started OpenBSD Secure Shell server. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.63' (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 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 136.802353] kasan: CONFIG_KASAN_INLINE enabled [ 136.807050] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 136.814803] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 136.821033] Modules linked in: [ 136.824262] CPU: 1 PID: 12439 Comm: syz-executor414 Not tainted 4.14.300-syzkaller #0 [ 136.832204] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 136.841606] task: ffff888099634580 task.stack: ffff88809ae68000 [ 136.847644] RIP: 0010:pppol2tp_session_init+0x1ca/0x4d0 [ 136.852978] RSP: 0018:ffff88809ae6fc50 EFLAGS: 00010202 [ 136.858313] RAX: dffffc0000000000 RBX: ffff8880aa877200 RCX: 1ffffffff11995ad [ 136.865559] RDX: 0000000000000045 RSI: ffffffff87cd1180 RDI: 0000000000000228 [ 136.872827] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020011 [ 136.880078] R10: ffff888099634e30 R11: ffff888099634580 R12: 0000000000003097 [ 136.887320] R13: 0000000000000006 R14: ffff8880991b4312 R15: ffff8880991b4330 [ 136.894577] FS: 000055555641d300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 136.902776] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 136.908630] CR2: 0000000020016800 CR3: 000000009a896000 CR4: 00000000003406e0 [ 136.915876] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 136.923119] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 136.930362] Call Trace: [ 136.932929] pppol2tp_connect+0xd5c/0x13d0 [ 136.937137] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 136.942302] ? lock_acquire+0x170/0x3f0 [ 136.946256] ? lock_downgrade+0x740/0x740 [ 136.950380] ? security_socket_connect+0x83/0xb0 [ 136.955108] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 136.960272] SyS_connect+0x1f4/0x240 [ 136.963962] ? SyS_accept+0x30/0x30 [ 136.967570] ? up_read+0x17/0x30 [ 136.970942] ? __do_page_fault+0x159/0xad0 [ 136.975174] ? do_syscall_64+0x4c/0x640 [ 136.979122] ? SyS_accept+0x30/0x30 [ 136.982727] do_syscall_64+0x1d5/0x640 [ 136.986590] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 136.991749] 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 [ 137.010823] RIP: pppol2tp_session_init+0x1ca/0x4d0 RSP: ffff88809ae6fc50 [ 137.018170] ---[ end trace 48a48c69d28c904c ]--- [ 137.023154] Kernel panic - not syncing: Fatal exception [ 137.028684] Kernel Offset: disabled [ 137.032292] Rebooting in 86400 seconds..