Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.766892] FAULT_INJECTION: forcing a failure. [ 27.766892] name failslab, interval 1, probability 0, space 0, times 1 [ 27.778537] CPU: 0 PID: 7990 Comm: syz-executor168 Not tainted 4.14.280-syzkaller #0 [ 27.786394] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.795724] Call Trace: [ 27.798288] dump_stack+0x1b2/0x281 [ 27.801916] should_fail.cold+0x10a/0x149 [ 27.806041] should_failslab+0xd6/0x130 [ 27.809991] kmem_cache_alloc+0x28e/0x3c0 [ 27.814115] __kernfs_new_node+0x6f/0x470 [ 27.818237] kernfs_new_node+0x7b/0xe0 [ 27.822103] __kernfs_create_file+0x3d/0x320 [ 27.826485] sysfs_add_file_mode_ns+0x1e1/0x450 [ 27.831130] sysfs_merge_group+0xdc/0x200 [ 27.835255] dpm_sysfs_add+0x122/0x1c0 [ 27.839116] device_add+0x977/0x15c0 [ 27.842805] ? device_is_dependent+0x2a0/0x2a0 [ 27.847361] ? __raw_spin_lock_init+0x28/0x100 [ 27.851922] tty_register_device_attr+0x337/0x710 [ 27.856739] ? redirected_tty_write+0xb0/0xb0 [ 27.861229] ? __raw_spin_lock_init+0x28/0x100 [ 27.865790] ? tty_port_init+0xa2/0x190 [ 27.869750] ? gsm_dlci_alloc+0x390/0x460 [ 27.873886] gsmld_open+0x548/0x7b0 [ 27.877492] ? gsm_cleanup_mux+0x3f0/0x3f0 [ 27.881717] tty_ldisc_open+0x6c/0xb0 [ 27.885503] tty_set_ldisc+0x287/0x5d0 [ 27.889380] tty_ioctl+0xa2a/0x1430 [ 27.892990] ? tty_fasync+0x2c0/0x2c0 [ 27.896783] ? proc_fail_nth_write+0x7b/0x180 [ 27.901270] ? proc_tgid_io_accounting+0x7a0/0x7a0 [ 27.906199] ? fsnotify+0x974/0x11b0 [ 27.909890] ? proc_tgid_io_accounting+0x7a0/0x7a0 [ 27.914796] ? debug_check_no_obj_freed+0x2c0/0x680 [ 27.919800] ? tty_fasync+0x2c0/0x2c0 [ 27.923578] do_vfs_ioctl+0x75a/0xff0 [ 27.927356] ? ioctl_preallocate+0x1a0/0x1a0 [ 27.931747] ? vfs_write+0x319/0x4d0 [ 27.935703] ? SyS_write+0x14d/0x210 [ 27.939396] ? security_file_ioctl+0x83/0xb0 [ 27.943780] SyS_ioctl+0x7f/0xb0 [ 27.947126] ? do_vfs_ioctl+0xff0/0xff0 [ 27.951082] do_syscall_64+0x1d5/0x640 [ 27.954963] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 27.960128] RIP: 0033:0x7f016cbac689 [ 27.963810] RSP: 002b:00007ffc15c74398 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 27.971490] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f016cbac689 [ 27.978737] RDX: 0000000020000040 RSI: 0000000000005423 RDI: 0000000000000003 [ 27.985986] RBP: 00007ffc15c743a0 R08: 0000000000000002 R09: 00007f016c003931 [ 27.993227] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 28.000468] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 28.099632] kasan: CONFIG_KASAN_INLINE enabled [ 28.109512] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.122281] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.128519] Modules linked in: [ 28.131703] CPU: 0 PID: 7990 Comm: syz-executor168 Not tainted 4.14.280-syzkaller #0 [ 28.139568] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.148914] task: ffff8880990b0040 task.stack: ffff88809faf0000 [ 28.154962] RIP: 0010:cdev_del+0x22/0x90 [ 28.159010] RSP: 0018:ffff88809faf7b90 EFLAGS: 00010207 [ 28.164362] RAX: dffffc0000000000 RBX: ffff8880b0a3c000 RCX: 0000000000000000 [ 28.171619] RDX: 000000000000000c RSI: ffff8880990b08f0 RDI: 0000000000000064 [ 28.178869] RBP: 0000000000000000 R08: ffffffff8b9bc5f0 R09: 0000000000000000 [ 28.186117] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b0a3c008 [ 28.193361] R13: ffff8880af019288 R14: ffff8880b6116c40 R15: ffff88809a74f8d8 [ 28.200606] FS: 0000555555d1c300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 28.208804] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.214658] CR2: 00007ffce64c2627 CR3: 00000000b5237000 CR4: 00000000003406f0 [ 28.221905] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.229153] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.236395] Call Trace: [ 28.238964] tty_unregister_device+0x101/0x1a0 [ 28.243521] gsmld_close+0xaa/0x1f0 [ 28.247122] ? gsmtty_cleanup+0x150/0x150 [ 28.251245] tty_ldisc_close+0x8c/0xc0 [ 28.255109] tty_ldisc_release+0xe8/0x400 [ 28.259235] tty_release_struct+0x20/0xe0 [ 28.263360] tty_release+0xb3f/0x10d0 [ 28.267142] ? do_tty_hangup+0x30/0x30 [ 28.271006] __fput+0x25f/0x7a0 [ 28.274261] task_work_run+0x11f/0x190 [ 28.278126] do_exit+0xa44/0x2850 [ 28.281555] ? ioctl_preallocate+0x1a0/0x1a0 [ 28.285937] ? mm_update_next_owner+0x5b0/0x5b0 [ 28.290580] ? vfs_write+0x319/0x4d0 [ 28.294269] ? SyS_write+0x14d/0x210 [ 28.297960] do_group_exit+0x100/0x2e0 [ 28.301835] SyS_exit_group+0x19/0x20 [ 28.305614] ? do_group_exit+0x2e0/0x2e0 [ 28.309650] do_syscall_64+0x1d5/0x640 [ 28.313525] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.318695] RIP: 0033:0x7f016cbab389 [ 28.322391] RSP: 002b:00007ffc15c74378 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.330075] RAX: ffffffffffffffda RBX: 00007f016cc1f3f0 RCX: 00007f016cbab389 [ 28.337332] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 28.344616] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 00007f016c003931 [ 28.351866] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f016cc1f3f0 [ 28.359120] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 28.366366] Code: a5 44 f7 ff eb d2 0f 1f 00 55 48 89 fd 48 83 ec 08 e8 73 8c 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 [ 28.385460] RIP: cdev_del+0x22/0x90 RSP: ffff88809faf7b90 [ 28.393765] ---[ end trace 9d31fd807b1d6354 ]--- [ 28.398779] Kernel panic - not syncing: Fatal exception [ 28.404289] Kernel Offset: disabled [ 28.407893] Rebooting in 86400 seconds..