[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.582187][ T26] audit: type=1800 audit(1556337927.080:25): pid=7677 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 37.618087][ T26] audit: type=1800 audit(1556337927.080:26): pid=7677 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 37.657606][ T26] audit: type=1800 audit(1556337927.090:27): pid=7677 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.210' (ECDSA) to the list of known hosts. 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 syzkaller login: [ 49.935732][ T7878] kobject_add_internal failed for hci3 (error: -2 parent: bluetooth) [ 49.960023][ T7878] Bluetooth: Can't register HCI device executing program executing program [ 49.982387][ T7881] WARNING: CPU: 0 PID: 7881 at fs/kernfs/dir.c:494 kernfs_get.part.0+0x73/0x90 [ 49.983413][ T7884] kobject: 'hci4' (00000000f52e060b): kobject_cleanup, parent 00000000f4b9a950 [ 49.991392][ T7881] Kernel panic - not syncing: panic_on_warn set ... [ 49.991411][ T7881] CPU: 0 PID: 7881 Comm: syz-executor336 Not tainted 5.1.0-rc6-next-20190426 #31 [ 49.991419][ T7881] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.991425][ T7881] Call Trace: [ 49.991450][ T7881] dump_stack+0x172/0x1f0 executing program [ 49.991468][ T7881] ? kernfs_get.part.0+0x10/0x90 [ 49.991484][ T7881] panic+0x2cb/0x75a [ 49.991499][ T7881] ? __warn_printk+0xf3/0xf3 [ 49.991518][ T7881] ? kernfs_get.part.0+0x73/0x90 [ 49.991543][ T7881] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.005411][ T7886] kobject: 'bluetooth' (000000002ce82996): kobject_add_internal: parent: 'virtual', set: '(null)' [ 50.007086][ T7881] ? __warn.cold+0x5/0x47 [ 50.007103][ T7881] ? __warn+0xe8/0x1d0 [ 50.007121][ T7881] ? kernfs_get.part.0+0x73/0x90 [ 50.007143][ T7881] __warn.cold+0x20/0x47 [ 50.007155][ T7881] ? kernfs_get.part.0+0x73/0x90 [ 50.007170][ T7881] report_bug+0x263/0x2b0 [ 50.007189][ T7881] do_error_trap+0x11b/0x200 [ 50.017058][ T7888] kobject: 'hci3' (0000000083a6ad3c): kobject_add_internal: parent: 'bluetooth', set: 'devices' [ 50.026924][ T7881] do_invalid_op+0x37/0x50 [ 50.026950][ T7881] ? kernfs_get.part.0+0x73/0x90 [ 50.026967][ T7881] invalid_op+0x14/0x20 [ 50.026980][ T7881] RIP: 0010:kernfs_get.part.0+0x73/0x90 [ 50.026995][ T7881] Code: e6 e8 41 cf 99 ff 45 85 e4 74 1a e8 b7 cd 99 ff be 04 00 00 00 48 89 df e8 ba 85 d2 ff f0 ff 03 5b 41 5c 5d c3 e8 9d cd 99 ff <0f> 0b eb dd 48 89 df e8 b1 ab d2 ff eb c1 0f 1f 44 00 00 66 2e 0f [ 50.027001][ T7881] RSP: 0018:ffff888086bff810 EFLAGS: 00010293 [ 50.027012][ T7881] RAX: ffff8880858ec440 RBX: ffff88809829d7e0 RCX: ffffffff81d7613f [ 50.027019][ T7881] RDX: 0000000000000000 RSI: ffffffff81d76163 RDI: 0000000000000005 [ 50.027028][ T7881] RBP: ffff888086bff820 R08: ffff8880858ec440 R09: ffffed1013053afd [ 50.027035][ T7881] R10: ffffed1013053afc R11: ffff88809829d7e3 R12: 0000000000000000 [ 50.027042][ T7881] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88821b6f3380 [ 50.027061][ T7881] ? kernfs_get.part.0+0x4f/0x90 [ 50.027085][ T7881] ? kernfs_get.part.0+0x73/0x90 [ 50.031156][ T7886] kobject: 'hci1' (000000004c14444c): kobject_add_internal: parent: 'bluetooth', set: 'devices' [ 50.045476][ T7881] kernfs_new_node+0xb6/0x120 [ 50.045493][ T7881] kernfs_create_dir_ns+0x52/0x160 [ 50.045513][ T7881] sysfs_create_dir_ns+0x131/0x2a0 [ 50.045527][ T7881] ? sysfs_create_mount_point+0xa0/0xa0 [ 50.045547][ T7881] ? class_dir_child_ns_type+0xd/0x60 [ 50.045565][ T7881] kobject_add_internal.cold+0xe5/0x5d4 [ 50.045582][ T7881] kobject_add+0x150/0x1c0 [ 50.045595][ T7881] ? kset_create_and_add+0x1a0/0x1a0 [ 50.045616][ T7881] ? mutex_unlock+0xd/0x10 [ 50.045627][ T7881] ? device_add+0x2f1/0x17a0 [ 50.045655][ T7881] device_add+0x3b7/0x17a0 [ 50.051474][ T7884] kobject: 'hci4' (00000000f52e060b): calling ktype release [ 50.054532][ T7881] ? get_device_parent.isra.0+0x560/0x560 [ 50.054547][ T7881] ? up_write+0xbe/0x1e0 [ 50.054579][ T7881] hci_register_dev+0x2e8/0x860 [ 50.062322][ T7887] kobject: 'hci4' (00000000cee33af6): kobject_add_internal: parent: 'bluetooth', set: 'devices' [ 50.064119][ T7881] __vhci_create_device+0x2d0/0x5a0 [ 50.064139][ T7881] vhci_write+0x2d0/0x470 [ 50.064167][ T7881] new_sync_write+0x4c7/0x760 [ 50.070974][ T7888] kobject: 'hci3' (0000000083a6ad3c): kobject_uevent_env [ 50.081175][ T7881] ? default_llseek+0x2e0/0x2e0 [ 50.081199][ T7881] ? common_file_perm+0x238/0x720 [ 50.081219][ T7881] ? apparmor_file_permission+0x25/0x30 [ 50.081234][ T7881] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.081250][ T7881] ? security_file_permission+0x94/0x380 [ 50.081267][ T7881] __vfs_write+0xe4/0x110 [ 50.081281][ T7881] vfs_write+0x20c/0x580 [ 50.081298][ T7881] ksys_write+0x14f/0x2d0 [ 50.081319][ T7881] ? __ia32_sys_read+0xb0/0xb0 [ 50.086089][ T7884] kobject: 'hci4': free name [ 50.089709][ T7881] ? do_syscall_64+0x26/0x670 [ 50.089726][ T7881] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.089741][ T7881] ? do_syscall_64+0x26/0x670 [ 50.089759][ T7881] __x64_sys_write+0x73/0xb0 [ 50.089776][ T7881] do_syscall_64+0x103/0x670 [ 50.089793][ T7881] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.089804][ T7881] RIP: 0033:0x441269 [ 50.089825][ T7881] Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 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 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 50.095424][ T7887] kobject: 'hci4' (00000000cee33af6): kobject_uevent_env [ 50.099004][ T7881] RSP: 002b:00007ffdb7de8cc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 50.099017][ T7881] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441269 [ 50.099024][ T7881] RDX: 0000000000000002 RSI: 00000000200000c0 RDI: 0000000000000003 [ 50.099032][ T7881] RBP: 000000000000c2b9 R08: 00000000004002c8 R09: 00000000004002c8 [ 50.099040][ T7881] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000401fe0 [ 50.099048][ T7881] R13: 0000000000402070 R14: 0000000000000000 R15: 0000000000000000 [ 50.105042][ T7881] Kernel Offset: disabled [ 50.506555][ T7881] Rebooting in 86400 seconds..