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

[  362.024021] INFO: rcu_sched self-detected stall on CPU
[  362.029432] 	1-....: (124999 ticks this GP) idle=f9a/1/4611686018427387906 softirq=73140/73140 fqs=31238 
[  362.039293] 	 (t=125000 jiffies g=36742 c=36741 q=633)
[  362.044549] NMI backtrace for cpu 1
[  362.048153] CPU: 1 PID: 17059 Comm: syz-executor4 Not tainted 4.16.0+ #4
[  362.054963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  362.064292] Call Trace:
[  362.066846]  <IRQ>
[  362.068978]  dump_stack+0x1b9/0x294
[  362.081704]  nmi_cpu_backtrace.cold.4+0x19/0xce
[  362.091512]  nmi_trigger_cpumask_backtrace+0x151/0x192
[  362.096764]  arch_trigger_cpumask_backtrace+0x14/0x20
[  362.101928]  rcu_dump_cpu_stacks+0x175/0x1c2
[  362.111309]  check_cpu_stall.isra.61.cold.80+0x36c/0x59a
[  362.172363]  rcu_check_callbacks+0x21b/0xad0
[  362.230142]  update_process_times+0x2d/0x70
[  362.234439]  tick_sched_handle+0xa0/0x180
[  362.238565]  tick_sched_timer+0x42/0x130
[  362.242605]  __hrtimer_run_queues+0x3e3/0x10a0
[  362.290776]  hrtimer_interrupt+0x286/0x650
[  362.294994]  smp_apic_timer_interrupt+0x15d/0x710
[  362.326302]  apic_timer_interrupt+0xf/0x20
[  362.330507]  </IRQ>
[  362.332720] RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x1a/0x20
[  362.338837] RSP: 0018:ffff8801c7b5ede0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
[  362.346520] RAX: 0000000000000000 RBX: ffff8801ce12c8c0 RCX: ffffffff85a1dc9d
[  362.353762] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
[  362.361011] RBP: ffff8801c7b5ede0 R08: ffff8801c3d94300 R09: 0000000000000006
[  362.368261] R10: ffff8801c3d94300 R11: 0000000000000000 R12: 0000000000000000
[  362.375505] R13: 0000000000000000 R14: ffff8801ceaaed80 R15: ffff8801ce12cc18
[  362.387226]  snd_pcm_oss_prepare+0x7d/0x1b0
[  362.391529]  snd_pcm_oss_write3+0x1a7/0x220
[  362.395826]  snd_pcm_oss_write2+0x34c/0x460
[  362.408634]  snd_pcm_oss_sync1+0x332/0x5a0
[  362.448533]  snd_pcm_oss_sync.isra.29+0x790/0x980
[  362.466072]  snd_pcm_oss_release+0x214/0x290
[  362.475452]  __fput+0x34d/0x890
[  362.490736]  ____fput+0x15/0x20
[  362.493989]  task_work_run+0x1e4/0x290
[  362.512311]  do_exit+0x1aee/0x2730
[  362.635785]  do_group_exit+0x16f/0x430
[  362.657106]  get_signal+0x886/0x1960
[  362.717833]  do_signal+0x98/0x2040
[  362.764335]  exit_to_usermode_loop+0x28a/0x310
[  362.781265]  do_syscall_64+0x792/0x9d0
[  362.813438]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[  362.818600] RIP: 0033:0x455259
[  362.821763] RSP: 002b:00007fb730463ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
[  362.829446] RAX: fffffffffffffe00 RBX: 000000000072bf80 RCX: 0000000000455259
[  362.836692] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bf80
[  362.843936] RBP: 000000000072bf80 R08: 0000000000000000 R09: 000000000072bf58
[  362.851177] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[  362.858424] R13: 00007ffc071d643f R14: 00007fb7304649c0 R15: 0000000000000001
