[ 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 '10.128.1.80' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.096220] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 34.105151] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 34.114033] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 34.122896] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 34.131613] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 34.140560] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 34.149755] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 34.158467] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 34.167342] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. executing program executing program [ 34.232012] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 39.104246] nla_parse: 881 callbacks suppressed [ 39.104253] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 39.118177] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 39.128220] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 39.137078] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. executing program [ 39.146459] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 39.155142] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 39.163897] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 39.172475] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 39.181142] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 39.190203] block nbd0: NBD_DISCONNECT [ 39.194937] kasan: CONFIG_KASAN_INLINE enabled [ 39.199539] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 39.206919] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.211415] netlink: 4 bytes leftover after parsing attributes in process `syz-executor119'. [ 39.213147] Modules linked in: [ 39.213160] CPU: 1 PID: 8644 Comm: systemd-udevd Not tainted 4.14.307-syzkaller #0 [ 39.213165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 [ 39.213174] task: ffff888091baa2c0 task.stack: ffff8880a9c50000 [ 39.248015] RIP: 0010:__lock_acquire+0x1cc/0x3f20 [ 39.252838] RSP: 0018:ffff8880a9c57938 EFLAGS: 00010006 [ 39.258186] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 39.265469] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000110 [ 39.272745] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 39.279998] R10: 0000000000000001 R11: ffff888091baa2c0 R12: 0000000000000110 [ 39.287252] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8bed1e40 [ 39.294506] FS: 00007f07d9c828c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 39.302734] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.308636] CR2: 00007ffda68a1e58 CR3: 0000000091856000 CR4: 00000000003406e0 [ 39.315892] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.323472] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.330738] Call Trace: [ 39.333335] ? vprintk_emit+0x170/0x620 [ 39.337294] ? dev_vprintk_emit+0x1da/0x440 [ 39.341604] ? trace_hardirqs_on+0x10/0x10 [ 39.345822] ? dev_driver_string+0x160/0x160 [ 39.350216] ? __switch_to_asm+0x31/0x60 [ 39.354261] ? __switch_to_asm+0x25/0x60 [ 39.358308] ? __schedule+0x893/0x1de0 [ 39.362192] ? __mutex_lock+0x356/0x1310 [ 39.366250] lock_acquire+0x170/0x3f0 [ 39.370068] ? flush_workqueue+0xcb/0x1310 [ 39.374342] flush_workqueue+0xfa/0x1310 [ 39.378487] ? flush_workqueue+0xcb/0x1310 [ 39.382740] ? nbd_disconnect_and_put+0x99/0x140 [ 39.387490] ? lock_downgrade+0x740/0x740 [ 39.391740] ? check_flush_dependency+0x2a0/0x2a0 [ 39.396584] nbd_disconnect_and_put+0xc3/0x140 [ 39.401152] nbd_release+0x123/0x150 [ 39.404963] ? nbd_ioctl+0xad0/0xad0 [ 39.408671] __blkdev_put+0x5aa/0x800 [ 39.412480] ? revalidate_disk+0x1f0/0x1f0 [ 39.416725] ? locks_remove_file+0x2cd/0x420 [ 39.421217] ? blkdev_put+0x75/0x4c0 [ 39.424934] ? blkdev_put+0x4c0/0x4c0 [ 39.428735] blkdev_close+0x86/0xb0 [ 39.432362] __fput+0x25f/0x7a0 [ 39.435633] task_work_run+0x11f/0x190 [ 39.439602] exit_to_usermode_loop+0x1ad/0x200 [ 39.444204] do_syscall_64+0x4a3/0x640 [ 39.448427] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 39.453624] RIP: 0033:0x7f07d8dc8270 [ 39.457329] RSP: 002b:00007fffba424758 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 39.465360] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f07d8dc8270 [ 39.472737] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 39.480182] RBP: 00007f07d9c82710 R08: 0000000000000045 R09: 0000000000000018 [ 39.487619] R10: 0000555dc7effc48 R11: 0000000000000246 R12: 0000000000000000 [ 39.494974] R13: 0000555dc7effcd0 R14: 0000000000000003 R15: 000000000000000e [ 39.503216] 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 60 d8 2f 8b 0f 84 5f [ 39.522342] RIP: __lock_acquire+0x1cc/0x3f20 RSP: ffff8880a9c57938 [ 39.528675] ---[ end trace b728b0530269b2c6 ]--- [ 39.533532] Kernel panic - not syncing: Fatal exception [ 39.539252] Kernel Offset: disabled [ 39.543190] Rebooting in 86400 seconds..