[ 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 '10.128.0.197' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 32.039258] kasan: CONFIG_KASAN_INLINE enabled [ 32.043994] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 32.051622] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.057973] Modules linked in: [ 32.061160] CPU: 0 PID: 8795 Comm: syz-executor383 Not tainted 4.14.215-syzkaller #0 [ 32.069018] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.078361] task: ffff8880abca8300 task.stack: ffff88809aa68000 [ 32.085960] RIP: 0010:pppol2tp_session_init+0x1ca/0x4d0 [ 32.091308] RSP: 0018:ffff88809aa6fc50 EFLAGS: 00010202 [ 32.096663] RAX: dffffc0000000000 RBX: ffff8880afb22000 RCX: 1ffffffff11981ac [ 32.103953] RDX: 0000000000000045 RSI: ffffffff87ccd700 RDI: 0000000000000228 [ 32.111201] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020012 [ 32.118451] R10: ffff8880abca8bb0 R11: ffff8880abca8300 R12: 000000000000225b [ 32.125701] R13: 0000000000000002 R14: ffff8880ac079392 R15: ffff8880ac0793b0 [ 32.132948] FS: 000000000115c880(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 32.141150] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.147020] CR2: 0000000020000000 CR3: 00000000945ac000 CR4: 00000000001406f0 [ 32.154283] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.161528] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.168791] Call Trace: [ 32.171361] pppol2tp_connect+0xd11/0x1370 [ 32.175571] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 32.180747] ? lock_acquire+0x170/0x3f0 [ 32.184709] ? lock_downgrade+0x740/0x740 [ 32.188848] ? security_socket_connect+0x83/0xb0 [ 32.193586] ? pppol2tp_recv_payload_hook+0x1a0/0x1a0 [ 32.198768] SyS_connect+0x1f4/0x240 [ 32.202477] ? SyS_accept+0x30/0x30 [ 32.206082] ? up_read+0x17/0x30 [ 32.209445] ? __do_page_fault+0x159/0xad0 [ 32.213685] ? do_syscall_64+0x4c/0x640 [ 32.217647] ? SyS_accept+0x30/0x30 [ 32.221280] do_syscall_64+0x1d5/0x640 [ 32.225191] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 32.230378] RIP: 0033:0x4412c9 [ 32.233545] RSP: 002b:00007fff06eac058 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 32.241229] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004412c9 [ 32.248476] RDX: 000000000000002e RSI: 0000000020000000 RDI: 0000000000000003 [ 32.255736] RBP: 0000000000007d2e R08: 00000000004002c8 R09: 00000000004002c8 [ 32.263000] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402070 [ 32.270514] R13: 0000000000402100 R14: 0000000000000000 R15: 0000000000000000 [ 32.277781] Code: fa 80 3d d5 af 50 03 00 0f 84 25 02 00 00 e8 ae 0d b5 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 00 b2 a5 [ 32.296875] RIP: pppol2tp_session_init+0x1ca/0x4d0 RSP: ffff88809aa6fc50 [ 32.304066] ---[ end trace a4a2e582b5db5f56 ]--- [ 32.309043] Kernel panic - not syncing: Fatal exception [ 32.314890] Kernel Offset: disabled [ 32.318560] Rebooting in 86400 seconds..