[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. syzkaller login: [ 28.090360] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 29.171453] kasan: CONFIG_KASAN_INLINE enabled [ 29.176116] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.184305] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.190535] Modules linked in: [ 29.193714] CPU: 1 PID: 8406 Comm: syz-executor156 Not tainted 4.14.300-syzkaller #0 [ 29.201565] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 29.210896] task: ffff8880af5d45c0 task.stack: ffff8880b0a80000 [ 29.216928] RIP: 0010:pppol2tp_session_init+0x1ca/0x4d0 [ 29.222260] RSP: 0018:ffff8880b0a87c50 EFLAGS: 00010202 [ 29.227594] RAX: dffffc0000000000 RBX: ffff8880afa3c940 RCX: 1ffffffff11995ad [ 29.234838] RDX: 0000000000000045 RSI: ffffffff87cd1180 RDI: 0000000000000228 [ 29.242079] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020011 [ 29.249319] R10: ffff8880af5d4e70 R11: ffff8880af5d45c0 R12: 00000000000020d6 [ 29.256679] R13: 0000000000000004 R14: ffff8880af556d52 R15: ffff8880af556d70 [ 29.263922] FS: 0000555557385300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 29.272121] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.277975] CR2: 00007f348ecf1018 CR3: 00000000a5b74000 CR4: 00000000003406e0 [ 29.285222] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.292463] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.299705] Call Trace: [ 29.302271] pppol2tp_connect+0xd5c/0x13d0 [ 29.306481] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 29.311645] ? lock_acquire+0x170/0x3f0 [ 29.315590] ? lock_downgrade+0x740/0x740 [ 29.319713] ? security_socket_connect+0x83/0xb0 [ 29.324530] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 29.329697] SyS_connect+0x1f4/0x240 [ 29.333384] ? SyS_accept+0x30/0x30 [ 29.336994] ? up_read+0x17/0x30 [ 29.340335] ? __do_page_fault+0x159/0xad0 [ 29.344552] ? do_syscall_64+0x4c/0x640 [ 29.348504] ? SyS_accept+0x30/0x30 [ 29.352110] do_syscall_64+0x1d5/0x640 [ 29.356014] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 29.361184] 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 [ 29.380254] RIP: pppol2tp_session_init+0x1ca/0x4d0 RSP: ffff8880b0a87c50 [ 29.388761] ---[ end trace a25dbf15909e5389 ]--- [ 29.393587] Kernel panic - not syncing: Fatal exception [ 29.399111] Kernel Offset: disabled [ 29.402716] Rebooting in 86400 seconds..