[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 45.063793][ T26] audit: type=1800 audit(1562006023.310:25): pid=7919 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 45.101358][ T26] audit: type=1800 audit(1562006023.320:26): pid=7919 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 45.133532][ T26] audit: type=1800 audit(1562006023.320:27): pid=7919 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.35' (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 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 executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 59.274514][ T8167] kobject_add_internal failed for hci4 (error: -2 parent: bluetooth) [ 59.274746][ T8166] kobject_add_internal failed for hci2 (error: -2 parent: bluetooth) [ 59.292041][ T8169] kobject_add_internal failed for hci3 (error: -2 parent: bluetooth) [ 59.305250][ T8167] Bluetooth: Can't register HCI device executing program executing program executing program executing program [ 59.323647][ T8169] Bluetooth: Can't register HCI device executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 59.350181][ T8166] Bluetooth: Can't register HCI device 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 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 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 executing program executing program executing program [ 59.833814][ T8283] kobject_add_internal failed for hci1 (error: -2 parent: bluetooth) [ 59.853621][ T8284] kobject_add_internal failed for hci2 (error: -2 parent: bluetooth) [ 59.867105][ T8284] Bluetooth: Can't register HCI device [ 59.871073][ T8283] Bluetooth: Can't register HCI device executing program executing program executing program [ 59.913573][ T8294] ------------[ cut here ]------------ [ 59.923590][ T8294] refcount_t: increment on 0; use-after-free. [ 59.932814][ T8294] WARNING: CPU: 1 PID: 8294 at lib/refcount.c:156 refcount_inc_checked+0x4b/0x50 [ 59.941936][ T8294] Kernel panic - not syncing: panic_on_warn set ... [ 59.948642][ T8294] CPU: 1 PID: 8294 Comm: syz-executor086 Not tainted 5.2.0-rc7 #12 [ 59.956691][ T8294] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.967004][ T8294] Call Trace: [ 59.970288][ T8294] dump_stack+0x1d8/0x2f8 [ 59.974602][ T8294] panic+0x28a/0x7c9 [ 59.978478][ T8294] ? is_mmconf_reserved+0x410/0x410 [ 59.983673][ T8294] ? __warn+0x126/0x220 [ 59.987829][ T8294] ? nmi_panic+0x97/0x97 [ 59.992075][ T8294] ? refcount_inc_checked+0x4b/0x50 [ 59.997269][ T8294] ? is_valid_bugaddr+0x81/0x100 [ 60.002195][ T8294] __warn+0x216/0x220 [ 60.006319][ T8294] ? refcount_inc_checked+0x4b/0x50 [ 60.011508][ T8294] report_bug+0x190/0x290 [ 60.015818][ T8294] ? refcount_inc_checked+0x4b/0x50 [ 60.020999][ T8294] do_error_trap+0xd7/0x450 [ 60.025490][ T8294] do_invalid_op+0x36/0x40 [ 60.029886][ T8294] ? refcount_inc_checked+0x4b/0x50 [ 60.035070][ T8294] invalid_op+0x14/0x20 [ 60.039209][ T8294] RIP: 0010:refcount_inc_checked+0x4b/0x50 [ 60.045057][ T8294] Code: 3d a7 68 7a 05 01 75 08 e8 42 47 16 fe 5b 5d c3 e8 3a 47 16 fe c6 05 91 68 7a 05 01 48 c7 c7 c1 4d 66 88 31 c0 e8 25 19 e8 fd <0f> 0b eb df 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 [ 60.064806][ T8294] RSP: 0018:ffff88809fa9f7f0 EFLAGS: 00010246 [ 60.070855][ T8294] RAX: 5c3359f64ee59e00 RBX: ffff88821ae62bf8 RCX: ffff88808682c6c0 [ 60.078818][ T8294] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 60.086893][ T8294] RBP: ffff88809fa9f7f8 R08: ffffffff815e87d4 R09: ffffed1015d66063 [ 60.094862][ T8294] R10: ffffed1015d66063 R11: 1ffff11015d66062 R12: ffff88809ec74480 [ 60.102821][ T8294] R13: 1ffff11013d8e890 R14: dffffc0000000000 R15: ffff88821ae62bf8 [ 60.110794][ T8294] ? vprintk_emit+0x2d4/0x3a0 [ 60.115467][ T8294] kobject_add_internal+0x8c4/0xd50 [ 60.120715][ T8294] ? kobject_set_name_vargs+0xd0/0x120 [ 60.126181][ T8294] kobject_add+0x138/0x200 [ 60.130587][ T8294] ? kobject_init+0x1e0/0x1e0 [ 60.135244][ T8294] ? kobject_init+0x86/0x1e0 [ 60.139814][ T8294] get_device_parent+0x48b/0x4e0 [ 60.144743][ T8294] device_add+0x3d6/0x1570 [ 60.149200][ T8294] ? dev_set_name+0xc8/0x110 [ 60.153779][ T8294] ? dev_set_name+0x110/0x110 [ 60.158456][ T8294] hci_register_dev+0x331/0x6c0 [ 60.163303][ T8294] vhci_create_device+0x2d1/0x510 [ 60.168318][ T8294] vhci_write+0x3ac/0x440 [ 60.172644][ T8294] __vfs_write+0x617/0x7d0 [ 60.177069][ T8294] ? __kernel_write+0x330/0x330 [ 60.181929][ T8294] ? security_file_permission+0x148/0x350 [ 60.187649][ T8294] ? rw_verify_area+0x1c2/0x360 [ 60.192504][ T8294] vfs_write+0x227/0x510 [ 60.196747][ T8294] ksys_write+0x16b/0x2a0 [ 60.201174][ T8294] ? up_read+0x22/0x30 [ 60.205238][ T8294] ? __ia32_sys_read+0x90/0x90 [ 60.209993][ T8294] ? check_preemption_disabled+0xb7/0x280 [ 60.215717][ T8294] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 60.221161][ T8294] ? trace_irq_disable_rcuidle+0x23/0x1c0 [ 60.226874][ T8294] ? do_syscall_64+0x1d/0x140 [ 60.231536][ T8294] __x64_sys_write+0x7b/0x90 [ 60.236108][ T8294] do_syscall_64+0xfe/0x140 [ 60.240594][ T8294] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 60.246465][ T8294] RIP: 0033:0x441289 [ 60.250346][ T8294] 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 [ 60.269944][ T8294] RSP: 002b:00007ffe62540878 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 60.278485][ T8294] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441289 [ 60.286491][ T8294] RDX: 0000000000000002 RSI: 0000000020000000 RDI: 0000000000000003 [ 60.294456][ T8294] RBP: 000000000000e96e R08: 00000000004002c8 R09: 00000000004002c8 [ 60.312014][ T8294] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402000 [ 60.319986][ T8294] R13: 0000000000402090 R14: 0000000000000000 R15: 0000000000000000 [ 60.329071][ T8294] Kernel Offset: disabled [ 60.333529][ T8294] Rebooting in 86400 seconds..