[ 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 '10.128.0.216' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.606785] FAULT_INJECTION: forcing a failure. [ 34.606785] name failslab, interval 1, probability 0, space 0, times 1 [ 34.618059] CPU: 0 PID: 8087 Comm: syz-executor804 Not tainted 4.19.211-syzkaller #0 [ 34.625927] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.635278] Call Trace: [ 34.637853] dump_stack+0x1fc/0x2ef [ 34.641464] should_fail.cold+0xa/0xf [ 34.645251] ? setup_fault_attr+0x200/0x200 [ 34.649557] ? lock_acquire+0x170/0x3c0 [ 34.653520] __should_failslab+0x115/0x180 [ 34.657741] should_failslab+0x5/0x10 [ 34.661525] kmem_cache_alloc+0x277/0x370 [ 34.665773] __kernfs_new_node+0xd2/0x680 [ 34.669925] ? kernfs_dop_revalidate+0x3a0/0x3a0 [ 34.674661] ? kernfs_find_and_get_ns+0x21/0x60 [ 34.679324] ? kernfs_find_and_get_ns+0x55/0x60 [ 34.683978] ? lock_downgrade+0x720/0x720 [ 34.688108] ? kernfs_find_and_get_ns+0x21/0x60 [ 34.692758] kernfs_new_node+0x92/0x120 [ 34.696719] __kernfs_create_file+0x51/0x340 [ 34.701113] sysfs_add_file_mode_ns+0x226/0x540 [ 34.705768] sysfs_merge_group+0x198/0x320 [ 34.709986] ? sysfs_update_group+0x30/0x30 [ 34.714295] ? kernfs_create_link+0x1b9/0x230 [ 34.718774] ? kernfs_put+0x31/0x50 [ 34.722388] dpm_sysfs_add+0x154/0x210 [ 34.726259] device_add+0xa43/0x16d0 [ 34.729955] ? device_check_offline+0x280/0x280 [ 34.734605] ? __raw_spin_lock_init+0x28/0x100 [ 34.739173] tty_register_device_attr+0x386/0x7a0 [ 34.744001] ? redirected_tty_write+0xb0/0xb0 [ 34.748476] ? __lockdep_init_map+0x100/0x5a0 [ 34.752954] ? __raw_spin_lock_init+0x28/0x100 [ 34.757518] ? tty_port_init+0x14d/0x1b0 [ 34.761562] ? gsm_dlci_alloc+0x353/0x410 [ 34.765692] gsmld_open+0x55f/0x7e0 [ 34.769298] ? gsmld_close+0x1f0/0x1f0 [ 34.773177] tty_ldisc_open+0x81/0xc0 [ 34.776956] tty_set_ldisc+0x2d2/0x650 [ 34.780826] tty_ioctl+0xb4b/0x1630 [ 34.784437] ? tty_fasync+0x300/0x300 [ 34.788222] ? get_pid_task+0xf4/0x190 [ 34.792091] ? proc_fail_nth_write+0x95/0x1d0 [ 34.796569] ? proc_tgid_io_accounting+0x7f0/0x7f0 [ 34.801478] ? debug_check_no_obj_freed+0x201/0x490 [ 34.806474] ? __vfs_write+0xff/0x770 [ 34.810262] ? proc_tgid_io_accounting+0x7f0/0x7f0 [ 34.815174] ? common_file_perm+0x4e5/0x850 [ 34.819477] ? tty_fasync+0x300/0x300 [ 34.823259] do_vfs_ioctl+0xcdb/0x12e0 [ 34.827129] ? vfs_write+0x3d7/0x540 [ 34.830828] ? ioctl_preallocate+0x200/0x200 [ 34.835220] ? lock_downgrade+0x720/0x720 [ 34.839352] ? check_preemption_disabled+0x41/0x280 [ 34.844381] ? vfs_write+0x393/0x540 [ 34.848078] ? ksys_write+0x1c8/0x2a0 [ 34.851859] ksys_ioctl+0x9b/0xc0 [ 34.855292] __x64_sys_ioctl+0x6f/0xb0 [ 34.859163] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 34.863730] do_syscall_64+0xf9/0x620 [ 34.867513] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.872679] RIP: 0033:0x7fb6ab4ba689 [ 34.876375] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 34.895255] RSP: 002b:00007fff6eb4acf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 34.902940] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fb6ab4ba689 [ 34.910190] RDX: 0000000020000040 RSI: 0000000000005423 RDI: 0000000000000003 [ 34.917436] RBP: 00007fff6eb4ad00 R08: 0000000000000002 R09: 00007fb6ab003931 [ 34.924684] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 34.931933] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 35.043718] kasan: CONFIG_KASAN_INLINE enabled [ 35.052904] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 35.072372] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 35.078625] CPU: 0 PID: 8087 Comm: syz-executor804 Not tainted 4.19.211-syzkaller #0 [ 35.086538] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.095893] RIP: 0010:cdev_del+0x22/0x90 [ 35.099952] Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 b3 dc be 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 48 [ 35.118851] RSP: 0018:ffff888097fa7ba0 EFLAGS: 00010207 [ 35.124207] RAX: dffffc0000000000 RBX: ffff8882388a6d00 RCX: ffffffff83b8674f [ 35.131462] RDX: 000000000000000c RSI: ffffffff81a3a8bd RDI: 0000000000000064 [ 35.138712] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 35.145966] R10: 0000000000000007 R11: 0000000000000000 R12: ffff8882388a6d08 [ 35.153233] R13: ffff8882389543c8 R14: ffff8880aa9e3700 R15: ffff8880b2bf44a8 [ 35.160487] FS: 00005555563cb300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 35.168693] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.174556] CR2: 00007fffd2d11d87 CR3: 0000000097fd7000 CR4: 00000000003406f0 [ 35.181808] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.189061] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.196311] Call Trace: [ 35.198890] tty_unregister_device+0x112/0x1b0 [ 35.203456] gsmld_close+0xaa/0x1f0 [ 35.207068] ? gsm_cleanup_mux+0x3e0/0x3e0 [ 35.211286] tty_ldisc_close+0xa2/0xd0 [ 35.215175] tty_ldisc_release+0xf5/0x440 [ 35.219310] tty_release_struct+0x20/0xe0 [ 35.223445] tty_release+0xc70/0x1210 [ 35.227236] ? do_tty_hangup+0x30/0x30 [ 35.231113] __fput+0x2ce/0x890 [ 35.234380] task_work_run+0x148/0x1c0 [ 35.238254] do_exit+0xbf3/0x2be0 [ 35.241694] ? lock_downgrade+0x720/0x720 [ 35.245915] ? mm_update_next_owner+0x650/0x650 [ 35.250569] ? up_read+0x17/0x110 [ 35.254006] ? __do_page_fault+0x180/0xd60 [ 35.258232] do_group_exit+0x125/0x310 [ 35.262107] __x64_sys_exit_group+0x3a/0x50 [ 35.266413] do_syscall_64+0xf9/0x620 [ 35.270201] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.275458] RIP: 0033:0x7fb6ab4b9389 [ 35.279170] Code: Bad RIP value. [ 35.282515] RSP: 002b:00007fff6eb4acd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 35.290203] RAX: ffffffffffffffda RBX: 00007fb6ab52d3f0 RCX: 00007fb6ab4b9389 [ 35.297454] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 35.304707] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 00007fb6ab003931 [ 35.311958] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb6ab52d3f0 [ 35.319209] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 35.326461] Modules linked in: [ 35.335952] ---[ end trace 4d69519d03474956 ]--- [ 35.340725] RIP: 0010:cdev_del+0x22/0x90 [ 35.345054] Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 b3 dc be 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 48 [ 35.365311] RSP: 0018:ffff888097fa7ba0 EFLAGS: 00010207 [ 35.370676] RAX: dffffc0000000000 RBX: ffff8882388a6d00 RCX: ffffffff83b8674f [ 35.378224] RDX: 000000000000000c RSI: ffffffff81a3a8bd RDI: 0000000000000064 [ 35.385532] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 35.392795] R10: 0000000000000007 R11: 0000000000000000 R12: ffff8882388a6d08 [ 35.400087] R13: ffff8882389543c8 R14: ffff8880aa9e3700 R15: ffff8880b2bf44a8 [ 35.407404] FS: 00005555563cb300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 35.415645] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.421520] CR2: 00007f1e296bf740 CR3: 00000000b5090000 CR4: 00000000003406f0 [ 35.428822] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.436150] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.443402] Kernel panic - not syncing: Fatal exception [ 35.448923] Kernel Offset: disabled [ 35.452534] Rebooting in 86400 seconds..