[ 73.418082][ T26] audit: type=1800 audit(1564130073.526:26): pid=10256 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 73.456304][ T26] audit: type=1800 audit(1564130073.526:27): pid=10256 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 73.476861][ T26] audit: type=1800 audit(1564130073.536:28): pid=10256 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 74.394869][ T26] audit: type=1800 audit(1564130074.536:29): pid=10256 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.19' (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 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 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: [ 467.049261][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 467.056988][ C0] rcu: 0-....: (10500 ticks this GP) idle=a56/1/0x4000000000000002 softirq=12266/12266 fqs=5250 [ 467.068605][ C0] (t=10502 jiffies g=14905 q=12) [ 467.076484][ C0] NMI backtrace for cpu 0 [ 467.082023][ C0] CPU: 0 PID: 10848 Comm: vhost-10847 Not tainted 5.3.0-rc1-next-20190725 #52 [ 467.091740][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 467.103044][ C0] Call Trace: [ 467.106637][ C0] [ 467.109879][ C0] dump_stack+0x172/0x1f0 [ 467.114314][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 467.120094][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 467.127536][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 467.134743][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 467.142019][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 467.149407][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 467.154890][ C0] ? find_next_bit+0x107/0x130 [ 467.160068][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 467.165904][ C0] ? raise_softirq+0x138/0x340 [ 467.170812][ C0] update_process_times+0x32/0x80 [ 467.176073][ C0] tick_sched_handle+0xa2/0x190 [ 467.181054][ C0] tick_sched_timer+0x53/0x140 [ 467.186119][ C0] __hrtimer_run_queues+0x364/0xe40 [ 467.191652][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 467.197630][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 467.204088][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 467.211143][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 467.219088][ C0] hrtimer_interrupt+0x314/0x770 [ 467.224376][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 467.230530][ C0] apic_timer_interrupt+0xf/0x20 [ 467.235510][ C0] [ 467.238870][ C0] RIP: 0010:check_memory_region+0x0/0x1a0 [ 467.244762][ C0] Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 f2 be f8 00 00 00 48 89 e5 e8 df 60 90 05 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 <48> 85 f6 0f 84 34 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 55 0f b6 [ 467.265505][ C0] RSP: 0018:ffff8880a40bf950 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 467.274098][ C0] RAX: 0000000000000000 RBX: ffff8880836a8220 RCX: ffffffff81599777 [ 467.282186][ C0] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880836a8220 [ 467.290349][ C0] RBP: ffff8880a40bf958 R08: 1ffff110106d5044 R09: ffffed10106d5045 [ 467.298734][ C0] R10: ffffed10106d5044 R11: ffff8880836a8223 R12: 0000000000000001 [ 467.307009][ C0] R13: 0000000000000003 R14: ffffed10106d5044 R15: 0000000000000001 [ 467.315312][ C0] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 467.322015][ C0] ? __kasan_check_read+0x11/0x20 [ 467.328762][ C0] native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 467.335347][ C0] ? handle_rx+0x109/0x1890 [ 467.340669][ C0] ? __pv_queued_spin_lock_slowpath+0xd10/0xd10 [ 467.347197][ C0] ? mark_held_locks+0xf0/0xf0 [ 467.352356][ C0] do_raw_spin_lock+0x20e/0x2e0 [ 467.357342][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 467.362654][ C0] ? lock_acquire+0x190/0x410 [ 467.367694][ C0] ? vq_meta_prefetch+0x2a0/0xcb0 [ 467.373026][ C0] _raw_spin_lock+0x37/0x40 [ 467.378077][ C0] ? vq_meta_prefetch+0x2a0/0xcb0 [ 467.383117][ C0] vq_meta_prefetch+0x2a0/0xcb0 [ 467.387997][ C0] handle_rx+0x145/0x1890 [ 467.392515][ C0] ? lock_downgrade+0x920/0x920 [ 467.397497][ C0] ? find_held_lock+0x130/0x130 [ 467.402377][ C0] ? finish_task_switch+0x147/0x720 [ 467.407683][ C0] ? __kasan_check_read+0x11/0x20 [ 467.412726][ C0] ? lock_downgrade+0x920/0x920 [ 467.418490][ C0] ? vhost_net_busy_poll+0x6a0/0x6a0 [ 467.424411][ C0] ? trace_hardirqs_off+0x1e0/0x240 [ 467.429777][ C0] ? __kasan_check_read+0x11/0x20 [ 467.435064][ C0] ? finish_task_switch+0x1f1/0x720 [ 467.440502][ C0] ? __schedule+0x75d/0x1580 [ 467.445508][ C0] handle_rx_net+0x19/0x20 [ 467.450152][ C0] vhost_worker+0x2af/0x4d0 [ 467.455104][ C0] ? vhost_dev_init+0x930/0x930 [ 467.460152][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 467.467111][ C0] ? __kthread_parkme+0x108/0x1c0 [ 467.473098][ C0] ? __kasan_check_read+0x11/0x20 [ 467.478569][ C0] kthread+0x361/0x430 [ 467.482848][ C0] ? vhost_dev_init+0x930/0x930 [ 467.487754][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 467.494226][ C0] ret_from_fork+0x24/0x30