[ 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 '10.128.0.115' (ECDSA) to the list of known hosts. syzkaller login: [ 32.840669] IPVS: ftp: loaded support on port[0] = 21 executing program [ 32.921822] FAULT_INJECTION: forcing a failure. [ 32.921822] name failslab, interval 1, probability 0, space 0, times 1 [ 32.933111] CPU: 1 PID: 8116 Comm: syz-executor416 Not tainted 4.19.211-syzkaller #0 [ 32.940991] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.950441] Call Trace: [ 32.953022] dump_stack+0x1fc/0x2ef [ 32.956642] should_fail.cold+0xa/0xf [ 32.960428] ? setup_fault_attr+0x200/0x200 [ 32.964737] ? lock_acquire+0x170/0x3c0 [ 32.968702] __should_failslab+0x115/0x180 [ 32.972917] should_failslab+0x5/0x10 [ 32.976697] kmem_cache_alloc+0x277/0x370 [ 32.980825] __kernfs_new_node+0xd2/0x680 [ 32.984952] ? kernfs_dop_revalidate+0x3a0/0x3a0 [ 32.989698] ? kernfs_find_and_get_ns+0x21/0x60 [ 32.994455] ? kernfs_find_and_get_ns+0x55/0x60 [ 32.999117] ? lock_downgrade+0x720/0x720 [ 33.003254] ? kernfs_find_and_get_ns+0x21/0x60 [ 33.007905] kernfs_new_node+0x92/0x120 [ 33.011862] __kernfs_create_file+0x51/0x340 [ 33.016251] sysfs_add_file_mode_ns+0x226/0x540 [ 33.020902] sysfs_merge_group+0x198/0x320 [ 33.025116] ? sysfs_update_group+0x30/0x30 [ 33.029417] ? kernfs_create_link+0x1b9/0x230 [ 33.033891] ? kernfs_put+0x31/0x50 [ 33.037497] dpm_sysfs_add+0x154/0x210 [ 33.041365] device_add+0xa43/0x16d0 [ 33.045058] ? device_check_offline+0x280/0x280 [ 33.049801] ? __raw_spin_lock_init+0x28/0x100 [ 33.054507] tty_register_device_attr+0x386/0x7a0 [ 33.059344] ? redirected_tty_write+0xb0/0xb0 [ 33.063830] ? __lockdep_init_map+0x100/0x5a0 [ 33.068309] ? __raw_spin_lock_init+0x28/0x100 [ 33.072869] ? tty_port_init+0x14d/0x1b0 [ 33.076912] ? gsm_dlci_alloc+0x353/0x410 [ 33.081037] gsmld_open+0x55f/0x7e0 [ 33.084644] ? gsmld_close+0x1f0/0x1f0 [ 33.088509] tty_ldisc_open+0x81/0xc0 [ 33.092286] tty_set_ldisc+0x2d2/0x650 [ 33.096155] tty_ioctl+0xb4b/0x1630 [ 33.099768] ? tty_fasync+0x300/0x300 [ 33.103547] ? get_pid_task+0xf4/0x190 [ 33.107412] ? proc_fail_nth_write+0x95/0x1d0 [ 33.111897] ? proc_tgid_io_accounting+0x7f0/0x7f0 [ 33.116806] ? debug_check_no_obj_freed+0x201/0x490 [ 33.121804] ? __vfs_write+0xff/0x770 [ 33.125582] ? proc_tgid_io_accounting+0x7f0/0x7f0 [ 33.130488] ? common_file_perm+0x4e5/0x850 [ 33.134786] ? tty_fasync+0x300/0x300 [ 33.138581] do_vfs_ioctl+0xcdb/0x12e0 [ 33.142450] ? vfs_write+0x3d7/0x540 [ 33.146142] ? ioctl_preallocate+0x200/0x200 [ 33.150530] ? lock_downgrade+0x720/0x720 [ 33.154657] ? check_preemption_disabled+0x41/0x280 [ 33.159652] ? vfs_write+0x393/0x540 [ 33.163348] ? ksys_write+0x1c8/0x2a0 [ 33.167128] ksys_ioctl+0x9b/0xc0 [ 33.170561] __x64_sys_ioctl+0x6f/0xb0 [ 33.174429] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 33.178994] do_syscall_64+0xf9/0x620 [ 33.182776] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.187944] RIP: 0033:0x7fb7d0795d59 [ 33.191637] Code: 28 c3 e8 1a 15 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 [ 33.210517] RSP: 002b:00007ffea5f1e5e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 33.218202] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fb7d0795d59 [ 33.225448] RDX: 0000000020000040 RSI: 0000000000005423 RDI: 0000000000000004 [ 33.232697] RBP: 0000000000000002 R08: 0000000000000002 R09: 00007ffea5f1e618 [ 33.239947] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffea5f1e600 [ 33.247195] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 33.352956] kasan: CONFIG_KASAN_INLINE enabled [ 33.358699] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 33.374310] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.380559] CPU: 0 PID: 8116 Comm: syz-executor416 Not tainted 4.19.211-syzkaller #0 [ 33.388431] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.397794] RIP: 0010:cdev_del+0x22/0x90 [ 33.401853] 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 [ 33.420751] RSP: 0018:ffff88809527fc50 EFLAGS: 00010207 [ 33.426110] RAX: dffffc0000000000 RBX: ffff8882388bc400 RCX: ffffffff83b8674f [ 33.433460] RDX: 000000000000000c RSI: ffffffff81a3a8bd RDI: 0000000000000064 [ 33.440726] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 33.447992] R10: 0000000000000007 R11: 0000000000000000 R12: ffff8882388bc408 [ 33.455258] R13: ffff888238962c88 R14: ffff8880b0c1c628 R15: ffff8880af0c2e00 [ 33.462525] FS: 0000555555fb1300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 33.470745] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.476638] CR2: 00007fffa409fff8 CR3: 00000000aec32000 CR4: 00000000003406f0 [ 33.483888] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.491135] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.498383] Call Trace: [ 33.500953] tty_unregister_device+0x112/0x1b0 [ 33.505511] gsmld_close+0xaa/0x1f0 [ 33.509113] ? gsm_cleanup_mux+0x3e0/0x3e0 [ 33.513323] tty_ldisc_close+0xa2/0xd0 [ 33.517188] tty_ldisc_hangup+0x2a1/0x700 [ 33.521316] __tty_hangup.part.0+0x359/0x780 [ 33.525701] tty_vhangup+0x1d/0x30 [ 33.529218] pty_close+0x3a1/0x4f0 [ 33.532734] ? pty_cleanup+0x40/0x40 [ 33.536425] tty_release+0x45e/0x1210 [ 33.540208] ? do_tty_hangup+0x30/0x30 [ 33.544075] __fput+0x2ce/0x890 [ 33.547334] task_work_run+0x148/0x1c0 [ 33.551206] exit_to_usermode_loop+0x251/0x2a0 [ 33.555765] do_syscall_64+0x538/0x620 [ 33.559638] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.564806] RIP: 0033:0x7fb7d07584c3 [ 33.568494] Code: c7 c2 c0 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb ba 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 [ 33.587372] RSP: 002b:00007ffea5f1e5e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 33.595061] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007fb7d07584c3 [ 33.602307] RDX: 0000000020000040 RSI: 0000000000005423 RDI: 0000000000000003 [ 33.609552] RBP: 0000000000000002 R08: 0000000000000002 R09: 00007ffea5f1e618 [ 33.616798] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffea5f1e600 [ 33.624046] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 33.631295] Modules linked in: [ 33.636775] ---[ end trace 742ac6f4b4d49d1a ]--- [ 33.641543] RIP: 0010:cdev_del+0x22/0x90 [ 33.645863] 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 [ 33.664925] RSP: 0018:ffff88809527fc50 EFLAGS: 00010207 [ 33.670279] RAX: dffffc0000000000 RBX: ffff8882388bc400 RCX: ffffffff83b8674f [ 33.677711] RDX: 000000000000000c RSI: ffffffff81a3a8bd RDI: 0000000000000064 [ 33.685028] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 33.692285] R10: 0000000000000007 R11: 0000000000000000 R12: ffff8882388bc408 [ 33.699598] R13: ffff888238962c88 R14: ffff8880b0c1c628 R15: ffff8880af0c2e00 [ 33.706909] FS: 0000555555fb1300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 33.715183] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.721062] CR2: 00007fffa409fff8 CR3: 00000000aec32000 CR4: 00000000003406f0 [ 33.728365] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.735679] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.742936] Kernel panic - not syncing: Fatal exception [ 33.748438] Kernel Offset: disabled [ 33.752047] Rebooting in 86400 seconds..