[ 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 Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.3' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.741069] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. executing program executing program [ 28.809518] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. executing program [ 28.857906] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. [ 28.897884] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. executing program executing program [ 28.947329] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. executing program [ 28.997632] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. executing program [ 29.047931] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. [ 29.088121] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. executing program executing program [ 29.137021] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. executing program [ 29.187014] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 33.767064] nla_parse: 85 callbacks suppressed [ 33.767069] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. [ 33.780566] block nbd0: NBD_DISCONNECT [ 33.784713] kasan: CONFIG_KASAN_INLINE enabled [ 33.789287] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 33.791785] netlink: 4 bytes leftover after parsing attributes in process `syz-executor769'. [ 33.796658] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.796664] Modules linked in: executing program [ 33.814854] CPU: 0 PID: 8639 Comm: systemd-udevd Not tainted 4.14.233-syzkaller #0 [ 33.822570] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.832705] task: ffff8880a94d6240 task.stack: ffff8880931f8000 [ 33.838830] RIP: 0010:__lock_acquire+0x1cc/0x3f20 [ 33.843647] RSP: 0018:ffff8880931ff938 EFLAGS: 00010006 [ 33.849087] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 33.856338] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000110 [ 33.863588] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 33.870837] R10: 0000000000000001 R11: ffff8880a94d6240 R12: 0000000000000110 [ 33.878089] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8bebcd40 [ 33.885345] FS: 00007f098d1ba8c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 33.893556] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.899418] CR2: 00007ffd4e04e9b0 CR3: 000000009325e000 CR4: 00000000001406f0 [ 33.906668] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.913918] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.921185] Call Trace: [ 33.923759] ? vprintk_emit+0x170/0x620 [ 33.927714] ? dev_vprintk_emit+0x1da/0x440 [ 33.932013] ? trace_hardirqs_on+0x10/0x10 [ 33.936225] ? dev_driver_string+0x160/0x160 [ 33.940643] ? __schedule+0x893/0x1de0 [ 33.944512] ? __mutex_lock+0x356/0x1310 [ 33.948555] lock_acquire+0x170/0x3f0 [ 33.952360] ? flush_workqueue+0xcb/0x1310 [ 33.956574] flush_workqueue+0xfa/0x1310 [ 33.960620] ? flush_workqueue+0xcb/0x1310 [ 33.964833] ? nbd_disconnect_and_put+0x99/0x140 [ 33.969571] ? lock_downgrade+0x740/0x740 [ 33.973702] ? check_flush_dependency+0x2a0/0x2a0 [ 33.978603] nbd_disconnect_and_put+0xc3/0x140 [ 33.983270] nbd_release+0x123/0x150 [ 33.986968] ? nbd_queue_rq+0xc50/0xc50 [ 33.990930] __blkdev_put+0x5aa/0x800 [ 33.994856] ? revalidate_disk+0x1f0/0x1f0 [ 33.999076] ? locks_remove_file+0x2cd/0x420 [ 34.003468] ? blkdev_put+0x75/0x4c0 [ 34.007162] ? blkdev_put+0x4c0/0x4c0 [ 34.010944] blkdev_close+0x86/0xb0 [ 34.014573] __fput+0x25f/0x7a0 [ 34.017838] task_work_run+0x11f/0x190 [ 34.021708] exit_to_usermode_loop+0x1ad/0x200 [ 34.026269] do_syscall_64+0x4a3/0x640 [ 34.030140] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 34.035308] RIP: 0033:0x7f098c300270 [ 34.039099] RSP: 002b:00007ffd4e00a6f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 34.047094] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f098c300270 [ 34.054437] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 34.061688] RBP: 00007f098d1ba710 R08: 0000000000000045 R09: 0000000000000018 [ 34.069045] R10: 000055e47e547fb8 R11: 0000000000000246 R12: 0000000000000000 [ 34.076412] R13: 000055e47e547e20 R14: 0000000000000003 R15: 000000000000000e [ 34.083667] Code: 18 00 00 00 00 48 81 c4 80 01 00 00 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 67 2a 00 00 49 81 3c 24 a0 87 2e 8b 0f 84 5f [ 34.102853] RIP: __lock_acquire+0x1cc/0x3f20 RSP: ffff8880931ff938 [ 34.109162] ---[ end trace a43992557b383fe1 ]--- [ 34.113899] Kernel panic - not syncing: Fatal exception [ 34.120094] Kernel Offset: disabled [ 34.123723] Rebooting in 86400 seconds..