[ 53.204214][ T25] audit: type=1800 audit(1554979296.188:24): pid=8727 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2454 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 53.718526][ T25] audit: type=1800 audit(1554979296.778:25): pid=8727 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 53.738157][ T25] audit: type=1800 audit(1554979296.778:26): pid=8727 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 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 '10.128.1.21' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 481.177150][ T1023] INFO: task syz-executor014:8876 blocked for more than 143 seconds. [ 481.185294][ T1023] Not tainted 5.1.0-rc4-next-20190411 #23 [ 481.191560][ T1023] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 481.200260][ T1023] syz-executor014 D28160 8876 8874 0x80000002 [ 481.206699][ T1023] Call Trace: [ 481.210144][ T1023] __schedule+0x817/0x1cc0 [ 481.214698][ T1023] ? retint_kernel+0x2d/0x2d [ 481.219347][ T1023] ? __sched_text_start+0x8/0x8 [ 481.224198][ T1023] ? __mutex_lock+0x527/0x1310 [ 481.228967][ T1023] schedule+0x92/0x180 [ 481.233039][ T1023] schedule_preempt_disabled+0x13/0x20 [ 481.238505][ T1023] __mutex_lock+0x726/0x1310 [ 481.243150][ T1023] ? snd_seq_kernel_client_ctl+0xe5/0x170 [ 481.248887][ T1023] ? mutex_trylock+0x1e0/0x1e0 [ 481.253701][ T1023] ? snd_seq_oss_release+0xf5/0x150 [ 481.259009][ T1023] ? odev_release+0x54/0x80 [ 481.263568][ T1023] ? __fput+0x2e5/0x8d0 [ 481.267823][ T1023] ? task_work_run+0x14a/0x1c0 [ 481.272599][ T1023] ? do_exit+0x90a/0x2fa0 [ 481.276954][ T1023] ? do_group_exit+0x135/0x370 [ 481.281712][ T1023] ? __x64_sys_exit_group+0x44/0x50 [ 481.286959][ T1023] ? do_syscall_64+0x103/0x610 [ 481.291721][ T1023] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 481.297833][ T1023] ? kasan_check_write+0x14/0x20 [ 481.302785][ T1023] ? do_raw_spin_lock+0x12a/0x2e0 [ 481.307910][ T1023] mutex_lock_nested+0x16/0x20 [ 481.312675][ T1023] ? mutex_lock_nested+0x16/0x20 [ 481.317698][ T1023] snd_seq_kernel_client_ctl+0xe5/0x170 [ 481.323239][ T1023] snd_seq_oss_writeq_clear+0xe0/0x140 [ 481.328709][ T1023] ? snd_seq_oss_writeq_wakeup+0xc0/0xc0 [ 481.334329][ T1023] ? snd_seq_oss_timer_delete+0x5a/0x80 [ 481.339893][ T1023] ? create_port+0x250/0x250 [ 481.344468][ T1023] snd_seq_oss_writeq_delete+0x20/0x40 [ 481.349942][ T1023] free_devinfo+0x66/0xc0 [ 481.354263][ T1023] port_delete+0xe8/0x1c0 [ 481.358680][ T1023] snd_seq_delete_port+0x266/0x330 [ 481.363786][ T1023] snd_seq_ioctl_delete_port+0xba/0x190 [ 481.369356][ T1023] snd_seq_kernel_client_ctl+0x112/0x170 [ 481.374989][ T1023] ? snd_seq_info_done+0x30/0x30 [ 481.380032][ T1023] snd_seq_event_port_detach+0xba/0x100 [ 481.385575][ T1023] ? snd_seq_event_port_attach+0x220/0x220 [ 481.391408][ T1023] ? kasan_check_write+0x14/0x20 [ 481.396391][ T1023] ? kfree+0x1bf/0x230 [ 481.400530][ T1023] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 481.406423][ T1023] delete_port+0x87/0xd0 [ 481.410705][ T1023] snd_seq_oss_release+0xf5/0x150 [ 481.415718][ T1023] odev_release+0x54/0x80 [ 481.420345][ T1023] __fput+0x2e5/0x8d0 [ 481.424309][ T1023] ____fput+0x16/0x20 [ 481.428307][ T1023] task_work_run+0x14a/0x1c0 [ 481.432888][ T1023] do_exit+0x90a/0x2fa0 [ 481.437118][ T1023] ? putname+0xef/0x130 [ 481.441275][ T1023] ? mm_update_next_owner+0x640/0x640 [ 481.446653][ T1023] ? do_sys_open+0x31d/0x5d0 [ 481.451357][ T1023] ? filp_open+0x80/0x80 [ 481.455634][ T1023] ? up_read+0x1e/0x180 [ 481.459943][ T1023] do_group_exit+0x135/0x370 [ 481.464532][ T1023] __x64_sys_exit_group+0x44/0x50 [ 481.469568][ T1023] do_syscall_64+0x103/0x610 [ 481.474145][ T1023] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 481.480044][ T1023] RIP: 0033:0x43ed88 [ 481.483933][ T1023] Code: Bad RIP value. [ 481.488012][ T1023] RSP: 002b:00007ffe073a53b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 481.496498][ T1023] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed88 [ 481.504485][ T1023] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 481.512597][ T1023] RBP: 00000000004be588 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 481.520673][ T1023] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 481.528659][ T1023] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 481.536613][ T1023] INFO: lockdep is turned off. [ 481.541377][ T1023] NMI backtrace for cpu 1 [ 481.545684][ T1023] CPU: 1 PID: 1023 Comm: khungtaskd Not tainted 5.1.0-rc4-next-20190411 #23 [ 481.554326][ T1023] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 481.564358][ T1023] Call Trace: [ 481.567700][ T1023] dump_stack+0x172/0x1f0 [ 481.572011][ T1023] nmi_cpu_backtrace.cold+0x63/0xa4 [ 481.577212][ T1023] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 481.582834][ T1023] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 481.588793][ T1023] arch_trigger_cpumask_backtrace+0x14/0x20 [ 481.594662][ T1023] watchdog+0x9b7/0xec0 [ 481.598795][ T1023] kthread+0x357/0x430 [ 481.602843][ T1023] ? reset_hung_task_detector+0x30/0x30 [ 481.608521][ T1023] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 481.614740][ T1023] ret_from_fork+0x3a/0x50 [ 481.619253][ T1023] Sending NMI from CPU 1 to CPUs 0: [ 481.624480][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 [ 481.625446][ T1023] Kernel panic - not syncing: hung_task: blocked tasks [ 481.639536][ T1023] CPU: 1 PID: 1023 Comm: khungtaskd Not tainted 5.1.0-rc4-next-20190411 #23 [ 481.648176][ T1023] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 481.658215][ T1023] Call Trace: [ 481.661493][ T1023] dump_stack+0x172/0x1f0 [ 481.665848][ T1023] panic+0x2cb/0x72b [ 481.669718][ T1023] ? __warn_printk+0xf3/0xf3 [ 481.674298][ T1023] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 481.680038][ T1023] ? printk_safe_flush+0xf2/0x140 [ 481.685036][ T1023] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 481.691252][ T1023] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 481.696873][ T1023] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 481.703012][ T1023] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 481.709482][ T1023] watchdog+0x9c8/0xec0 [ 481.713631][ T1023] kthread+0x357/0x430 [ 481.717687][ T1023] ? reset_hung_task_detector+0x30/0x30 [ 481.723248][ T1023] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 481.729477][ T1023] ret_from_fork+0x3a/0x50 [ 481.734796][ T1023] Kernel Offset: disabled [ 481.739112][ T1023] Rebooting in 86400 seconds..