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

[  196.114026] INFO: rcu_sched detected stalls on CPUs/tasks:
[  196.119690] 	(detected by 0, t=125002 jiffies, g=15654, c=15653, q=133)
[  196.126427] All QSes seen, last rcu_sched kthread activity 125002 (4294863411-4294738409), jiffies_till_next_fqs=3, root ->qsmask 0x0
[  196.138535] syz-executor1   R  running task    24936 11943   3739 0x0000000c
[  196.145712] Call Trace:
[  196.148271]  <IRQ>
[  196.150403]  sched_show_task+0x4a3/0x5e0
[  196.174578]  print_other_cpu_stall+0x996/0x1090
[  196.236196]  check_cpu_stall.isra.61+0x6e6/0x15b0
[  196.307884]  rcu_check_callbacks+0x256/0xd00
[  196.364779]  update_process_times+0x30/0x60
[  196.369080]  tick_sched_handle+0x85/0x160
[  196.373206]  tick_sched_timer+0x42/0x120
[  196.377249]  __hrtimer_run_queues+0x358/0xe20
[  196.426526]  hrtimer_interrupt+0x1c2/0x5e0
[  196.430767]  smp_apic_timer_interrupt+0x14a/0x700
[  196.462113]  apic_timer_interrupt+0xa9/0xb0
[  196.466405]  </IRQ>
[  196.468619] RIP: 0010:check_memory_region+0x38/0x190
[  196.473693] RSP: 0000:ffff8801bd2ff868 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff11
[  196.481384] RAX: ffff7fffffffffff RBX: ffffc9000160020b RCX: ffffffff841fceaf
[  196.488632] RDX: 0000000000000001 RSI: 0000000000000002 RDI: ffffc9000160020a
[  196.495875] RBP: ffff8801bd2ff878 R08: ffffc9000160020a R09: dffffc0000000000
[  196.503120] R10: 0000000000000001 R11: ffffed0037a5ff2e R12: ffffc9000160020a
[  196.510365] R13: ffff8801bd2ff970 R14: dffffc0000000000 R15: ffffc9000160020a
[  196.525806]  memcpy+0x37/0x50
[  196.528895]  mulaw_decode+0x52f/0x770
[  196.547525]  mulaw_transfer+0x222/0x270
[  196.559384]  snd_pcm_plug_write_transfer+0x22d/0x420
[  196.581116]  snd_pcm_oss_write2+0x260/0x420
[  196.589913]  snd_pcm_oss_write+0x5fe/0x830
[  196.603813]  __vfs_write+0xef/0x970
[  196.650693]  vfs_write+0x189/0x510
[  196.654218]  SyS_write+0xef/0x220
[  196.670999]  entry_SYSCALL_64_fastpath+0x23/0x9a
[  196.675728] RIP: 0033:0x452ac9
[  196.678895] RSP: 002b:00007fa354a13c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
[  196.686582] RAX: ffffffffffffffda RBX: cccccccccccccccd RCX: 0000000000452ac9
[  196.693825] RDX: 00000000fffffeb2 RSI: 0000000020083fc6 RDI: 0000000000000014
[  196.701069] RBP: 00000000000005b5 R08: 0000000000000000 R09: 0000000000000000
[  196.708322] R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f6998
[  196.715566] R13: 00000000ffffffff R14: 00007fa354a146d4 R15: 0000000000000000
