TITLE: INFO: rcu detected stall in io_sq_thread
ALT: stall in io_sq_thread
TYPE: HANG

[  589.079232] rcu: INFO: rcu_sched self-detected stall on CPU
[  589.085351] rcu: 	0-....: (10499 ticks this GP) idle=d0a/1/0x4000000000000002 softirq=51093/51093 fqs=3111 
[  589.095364] rcu: 	 (t=10500 jiffies g=51445 q=1360)
[  589.100420] NMI backtrace for cpu 0
[  589.104157] CPU: 0 PID: 17938 Comm: io_uring-sq Not tainted 4.15.0-syzkaller #0
[  589.111615] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  589.120984] Call Trace:
[  589.123632]  <IRQ>
[  589.125842]  [<ffffffff849381e4>] dump_stack+0xe1/0x157
[  589.131235]  [<ffffffff81391101>] ? lapic_can_unplug_cpu+0x41/0x80
[  589.137578]  [<ffffffff849384ac>] nmi_cpu_backtrace.cold+0x63/0xa5
[  589.144040]  [<ffffffff81391140>] ? lapic_can_unplug_cpu+0x80/0x80
[  589.150560]  [<ffffffff847d8dc6>] nmi_trigger_cpumask_backtrace+0x1a6/0x1e0
[  589.157694]  [<ffffffff81391244>] arch_trigger_cpumask_backtrace+0x14/0x20
[  589.164738]  [<ffffffff84837133>] rcu_dump_cpu_stacks+0x183/0x1cf
[  589.170992]  [<ffffffff822fe0f7>] ? find_next_bit+0x107/0x130
[  589.176900]  [<ffffffff848381a7>] rcu_sched_clock_irq.cold+0x4d7/0x8a8
[  589.183583]  [<ffffffff81431a83>] ? raise_softirq+0x183/0x240
[  589.189495]  [<ffffffff8165c90d>] update_process_times+0x2d/0x70
[  589.195676]  [<ffffffff8168dd90>] tick_sched_handle+0xa0/0x180
[  589.201767]  [<ffffffff8168e384>] tick_sched_timer+0x44/0x130
[  589.207685]  [<ffffffff8166054b>] __hrtimer_run_queues+0x33b/0xd10
[  589.214033]  [<ffffffff8168e340>] ? tick_sched_do_timer+0x110/0x110
[  589.220465]  [<ffffffff81660210>] ? hrtimer_fixup_activate+0x30/0x30
[  589.226994]  [<ffffffff81661f5a>] hrtimer_interrupt+0x2ea/0x730
[  589.233080]  [<ffffffff84a04a69>] smp_apic_timer_interrupt+0x159/0x580
[  589.239769]  [<ffffffff84a019a3>] apic_timer_interrupt+0x93/0xa0
[  589.245935]  </IRQ>
[  589.248181] RIP: 0010:write_comp_data+0x9/0x70
[  589.252758] RSP: 0018:ffff8801e1757da8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff12
[  589.260594] RAX: 0000000000000007 RBX: ffff8801ef81c000 RCX: ffffffff81492f64
[  589.267982] RDX: 0000000000200000 RSI: 0000000000000000 RDI: 0000000000000005
[  589.275264] RBP: ffff8801e1757db0 R08: ffff8801ef81c000 R09: fffffbfff14ca71c
[  589.282674] R10: ffff8801e1757dd0 R11: 0000000000000000 R12: 0000000000200000
[  589.289959] R13: ffff8801a7091000 R14: 0000000000000002 R15: dffffc0000000000
[  589.297452]  [<ffffffff81492f64>] ? kthread_should_park+0x54/0xd0
[  589.304431]  [<ffffffff817436f6>] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[  589.311816]  [<ffffffff81492f64>] kthread_should_park+0x54/0xd0
[  589.318011]  [<ffffffff81d0a9d3>] io_sq_thread+0x213/0xc80
[  589.323709]  [<ffffffff81d0a7c0>] ? io_submit_sqes+0x28b0/0x28b0
[  589.329983]  [<ffffffff814934c0>] ? __kthread_parkme+0x250/0x360
[  589.336146]  [<ffffffff81000370>] ? __startup_64+0x180/0x180
[  589.341974]  [<ffffffff81558630>] ? finish_wait+0x260/0x260
[  589.347728]  [<ffffffff81496355>] kthread+0x345/0x410
[  589.352926]  [<ffffffff81d0a7c0>] ? io_submit_sqes+0x28b0/0x28b0
[  589.359083]  [<ffffffff81496010>] ? kthread_create_worker_on_cpu+0xf0/0xf0
[  589.366440]  [<ffffffff84a0019f>] ret_from_fork+0x3f/0x50
