[ OK ] Reached target Login Prompts. [ 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 '10.128.0.208' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.742929] FAULT_INJECTION: forcing a failure. [ 27.742929] name failslab, interval 1, probability 0, space 0, times 1 [ 27.754212] CPU: 0 PID: 7959 Comm: syz-executor365 Not tainted 4.14.285-syzkaller #0 [ 27.762078] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2022 [ 27.771409] Call Trace: [ 27.773985] dump_stack+0x1b2/0x281 [ 27.777591] should_fail.cold+0x10a/0x149 [ 27.781717] should_failslab+0xd6/0x130 [ 27.785667] kmem_cache_alloc+0x28e/0x3c0 [ 27.789789] __kernfs_new_node+0x6f/0x470 [ 27.793913] kernfs_new_node+0x7b/0xe0 [ 27.797778] __kernfs_create_file+0x3d/0x320 [ 27.802162] sysfs_add_file_mode_ns+0x1e1/0x450 [ 27.806808] sysfs_merge_group+0xdc/0x200 [ 27.810965] dpm_sysfs_add+0x122/0x1c0 [ 27.814827] device_add+0x977/0x15c0 [ 27.818535] ? device_is_dependent+0x2a0/0x2a0 [ 27.823111] ? __raw_spin_lock_init+0x28/0x100 [ 27.827671] tty_register_device_attr+0x337/0x710 [ 27.832490] ? redirected_tty_write+0xb0/0xb0 [ 27.836966] ? __raw_spin_lock_init+0x28/0x100 [ 27.841526] ? tty_port_init+0xa2/0x190 [ 27.845476] ? gsm_dlci_alloc+0x390/0x460 [ 27.849690] gsmld_open+0x548/0x7b0 [ 27.853307] ? gsm_cleanup_mux+0x3f0/0x3f0 [ 27.857527] tty_ldisc_open+0x6c/0xb0 [ 27.861309] tty_set_ldisc+0x287/0x5d0 [ 27.865173] tty_ioctl+0xa2a/0x1430 [ 27.868785] ? tty_fasync+0x2c0/0x2c0 [ 27.872567] ? proc_fail_nth_write+0x7b/0x180 [ 27.877104] ? proc_tgid_io_accounting+0x7a0/0x7a0 [ 27.882128] ? fsnotify+0x974/0x11b0 [ 27.885818] ? proc_tgid_io_accounting+0x7a0/0x7a0 [ 27.890723] ? debug_check_no_obj_freed+0x2c0/0x680 [ 27.895731] ? tty_fasync+0x2c0/0x2c0 [ 27.899536] do_vfs_ioctl+0x75a/0xff0 [ 27.903329] ? ioctl_preallocate+0x1a0/0x1a0 [ 27.907720] ? vfs_write+0x319/0x4d0 [ 27.911412] ? SyS_write+0x14d/0x210 [ 27.915107] ? security_file_ioctl+0x83/0xb0 [ 27.919503] SyS_ioctl+0x7f/0xb0 [ 27.922862] ? do_vfs_ioctl+0xff0/0xff0 [ 27.926829] do_syscall_64+0x1d5/0x640 [ 27.930710] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 27.935879] RIP: 0033:0x7f240f2c1789 [ 27.939571] RSP: 002b:00007fffe032aa48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 27.947256] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f240f2c1789 [ 27.954616] RDX: 0000000020000040 RSI: 0000000000005423 RDI: 0000000000000004 [ 27.961982] RBP: 00007fffe032aa60 R08: 0000000000000002 R09: 0000000000000001 [ 27.969501] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 [ 27.976756] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 28.038067] kasan: CONFIG_KASAN_INLINE enabled [ 28.043818] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.052976] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.059207] Modules linked in: [ 28.062399] CPU: 0 PID: 7959 Comm: syz-executor365 Not tainted 4.14.285-syzkaller #0 [ 28.070267] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2022 [ 28.079610] task: ffff8880971ee100 task.stack: ffff8880967d0000 [ 28.085661] RIP: 0010:cdev_del+0x22/0x90 [ 28.089711] RSP: 0018:ffff8880967d7b08 EFLAGS: 00010207 [ 28.095063] RAX: dffffc0000000000 RBX: ffff8880af029e00 RCX: 0000000000000000 [ 28.102326] RDX: 000000000000000c RSI: ffff8880971ee9d8 RDI: 0000000000000064 [ 28.109587] RBP: 0000000000000000 R08: ffffffff8b9d5cf0 R09: 0000000000000000 [ 28.116850] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880af029e08 [ 28.124542] R13: ffff8880af0faa48 R14: ffff88809a0e7428 R15: ffff88809a0e7638 [ 28.131803] FS: 0000555556dfb300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 28.140033] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.145905] CR2: 00007ffc0b040957 CR3: 00000000aa09c000 CR4: 00000000003406f0 [ 28.153167] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.160427] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.167681] Call Trace: [ 28.170254] tty_unregister_device+0x101/0x1a0 [ 28.174818] gsmld_close+0xaa/0x1f0 [ 28.178421] ? gsmtty_cleanup+0x150/0x150 [ 28.182647] tty_ldisc_close+0x8c/0xc0 [ 28.186519] tty_ldisc_hangup+0x269/0x6c0 [ 28.190747] ? do_tty_hangup+0x30/0x30 [ 28.194614] __tty_hangup.part.0+0x31a/0x730 [ 28.199003] ? do_tty_hangup+0x30/0x30 [ 28.202870] tty_vhangup+0x1d/0x30 [ 28.206393] pty_close+0x35f/0x4b0 [ 28.209909] ? pty_cleanup+0x40/0x40 [ 28.213603] tty_release+0x40b/0x10d0 [ 28.217384] ? ima_file_free+0x4f/0x330 [ 28.221335] ? do_tty_hangup+0x30/0x30 [ 28.225209] __fput+0x25f/0x7a0 [ 28.228468] task_work_run+0x11f/0x190 [ 28.232333] do_exit+0xa44/0x2850 [ 28.235765] ? __do_page_fault+0x571/0xad0 [ 28.239977] ? mm_update_next_owner+0x5b0/0x5b0 [ 28.244710] ? lock_downgrade+0x740/0x740 [ 28.248837] do_group_exit+0x100/0x2e0 [ 28.252704] SyS_exit_group+0x19/0x20 [ 28.256502] ? do_group_exit+0x2e0/0x2e0 [ 28.260555] do_syscall_64+0x1d5/0x640 [ 28.264513] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.269681] RIP: 0033:0x7f240f2c0459 [ 28.273372] RSP: 002b:00007fffe032aaa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.281065] RAX: ffffffffffffffda RBX: 00007f240f3343f0 RCX: 00007f240f2c0459 [ 28.288316] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 28.295658] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000001 [ 28.302903] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f240f3343f0 [ 28.310157] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 28.317412] Code: 05 3e f7 ff eb d2 0f 1f 00 55 48 89 fd 48 83 ec 08 e8 f3 84 cd ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f [ 28.336523] RIP: cdev_del+0x22/0x90 RSP: ffff8880967d7b08 [ 28.353089] ---[ end trace 6de863e6788242cf ]--- [ 28.357857] Kernel panic - not syncing: Fatal exception [ 28.363271] Kernel Offset: disabled [ 28.366880] Rebooting in 86400 seconds..