BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 121s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=7/256
    pending: defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, cache_reap
workqueue events_power_efficient: flags=0x80
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=3/256
    pending: gc_worker, neigh_periodic_work, neigh_periodic_work
workqueue mm_percpu_wq: flags=0x8
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
    pending: vmstat_update
workqueue kblockd: flags=0x18
  pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=1/256
    pending: blk_mq_timeout_work
workqueue krdsd: flags=0xe000a
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1
    pending: rds_connect_worker
INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks:
	1-....: (125000 ticks this GP) idle=3ce/1/4611686018427387906 softirq=74441/74441 fqs=31192 
	
	1-....: (125000 ticks this GP) idle=3ce/1/4611686018427387906 softirq=74441/74441 fqs=31192 
	
 (t=125002 jiffies g=36302 c=36301 q=1019)
(detected by 0, t=125002 jiffies, g=36302, c=36301, q=1019)
NMI backtrace for cpu 1
CPU: 1 PID: 16983 Comm: syz-executor4 Not tainted 4.16.0+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:156 [inline]
 rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1376
 print_cpu_stall kernel/rcu/tree.c:1525 [inline]
 check_cpu_stall.isra.61.cold.80+0x36c/0x59a kernel/rcu/tree.c:1593
 __rcu_pending kernel/rcu/tree.c:3356 [inline]
 rcu_pending kernel/rcu/tree.c:3401 [inline]
 rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0xa0/0x180 kernel/time/tick-sched.c:171
 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1179
 __run_hrtimer kernel/time/hrtimer.c:1337 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1399
 hrtimer_interrupt+0x286/0x650 kernel/time/hrtimer.c:1457
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:862
 </IRQ>
RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:793 [inline]
RIP: 0010:snd_pcm_stream_unlock_irq+0xb7/0xf0 sound/core/pcm_native.c:166
RSP: 0018:ffff8801aa66ea38 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8801b17102c0 RBX: 0000000000000000 RCX: 1ffff100362e216b
RDX: 0000000000000000 RSI: ffffffff859d5140 RDI: ffffffff88b172b8
RBP: ffff8801aa66ea40 R08: ffff8801b1710b38 R09: 0000000000000006
R10: ffff8801b17102c0 R11: 0000000000000000 R12: 0000000000000004
R13: 00000000ffffffe0 R14: ffff8801c3bbaa40 R15: ffff8801cebfbb00
 __snd_pcm_lib_xfer+0x739/0x1d10 sound/core/pcm_lib.c:2246
 snd_pcm_oss_write3+0xe9/0x220 sound/core/oss/pcm_oss.c:1236
 io_playback_transfer+0x274/0x310 sound/core/oss/io.c:47
 snd_pcm_plug_write_transfer+0x36c/0x470 sound/core/oss/pcm_plugin.c:619
 snd_pcm_oss_write2+0x25c/0x460 sound/core/oss/pcm_oss.c:1365
 snd_pcm_oss_sync1+0x332/0x5a0 sound/core/oss/pcm_oss.c:1606
 snd_pcm_oss_sync.isra.29+0x790/0x980 sound/core/oss/pcm_oss.c:1682
 snd_pcm_oss_release+0x214/0x290 sound/core/oss/pcm_oss.c:2559
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xf89/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2469
 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x792/0x9d0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x455259
RSP: 002b:00007fba89b5fce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 000000000072bec8 RCX: 0000000000455259
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8
RBP: 000000000072bec8 R08: 0000000000000000 R09: 000000000072bea0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a3e81f R14: 00007fba89b609c0 R15: 0000000000000000
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 16983 Comm: syz-executor4 Not tainted 4.16.0+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kasan_check_read+0x0/0x20 mm/kasan/kasan.c:167
RSP: 0018:ffff8801db1070a8 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffffed003b620e2f RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff88b8f9c0
RBP: ffff8801db107420 R08: fffffbfff1171f39 R09: fffffbfff1171f38
R10: fffffbfff1171f38 R11: ffffffff88b8f9c3 R12: ffffffff88b8f9c0
R13: ffff8801db1073f8 R14: 0000000000000001 R15: dffffc0000000000
FS:  00007fba89b60700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8e07956300 CR3: 0000000008a6a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:674 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:30 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:90 [inline]
 do_raw_spin_lock+0x1a7/0x200 kernel/locking/spinlock_debug.c:113
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
 _raw_spin_lock_irqsave+0x9e/0xc0 kernel/locking/spinlock.c:152
 print_cpu_stall kernel/rcu/tree.c:1527 [inline]
 check_cpu_stall.isra.61.cold.80+0x374/0x59a kernel/rcu/tree.c:1593
 __rcu_pending kernel/rcu/tree.c:3356 [inline]
 rcu_pending kernel/rcu/tree.c:3401 [inline]
 rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0xa0/0x180 kernel/time/tick-sched.c:171
 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1179
 __run_hrtimer kernel/time/hrtimer.c:1337 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1399
 hrtimer_interrupt+0x286/0x650 kernel/time/hrtimer.c:1457
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:862
 </IRQ>
RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:793 [inline]
RIP: 0010:snd_pcm_stream_unlock_irq+0xb7/0xf0 sound/core/pcm_native.c:166
RSP: 0018:ffff8801aa66ea38 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8801b17102c0 RBX: 0000000000000000 RCX: 1ffff100362e216b
RDX: 0000000000000000 RSI: ffffffff859d5140 RDI: ffffffff88b172b8
RBP: ffff8801aa66ea40 R08: ffff8801b1710b38 R09: 0000000000000006
R10: ffff8801b17102c0 R11: 0000000000000000 R12: 0000000000000004
R13: 00000000ffffffe0 R14: ffff8801c3bbaa40 R15: ffff8801cebfbb00
 __snd_pcm_lib_xfer+0x739/0x1d10 sound/core/pcm_lib.c:2246
 snd_pcm_oss_write3+0xe9/0x220 sound/core/oss/pcm_oss.c:1236
 io_playback_transfer+0x274/0x310 sound/core/oss/io.c:47
 snd_pcm_plug_write_transfer+0x36c/0x470 sound/core/oss/pcm_plugin.c:619
 snd_pcm_oss_write2+0x25c/0x460 sound/core/oss/pcm_oss.c:1365
 snd_pcm_oss_sync1+0x332/0x5a0 sound/core/oss/pcm_oss.c:1606
 snd_pcm_oss_sync.isra.29+0x790/0x980 sound/core/oss/pcm_oss.c:1682
 snd_pcm_oss_release+0x214/0x290 sound/core/oss/pcm_oss.c:2559
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xf89/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2469
 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x792/0x9d0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x455259
RSP: 002b:00007fba89b5fce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 000000000072bec8 RCX: 0000000000455259
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bec8
RBP: 000000000072bec8 R08: 0000000000000000 R09: 000000000072bea0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a3e81f R14: 00007fba89b609c0 R15: 0000000000000000
Code: 79 ff 00 74 e9 48 89 d8 e9 26 ff ff ff 49 0f be 02 41 83 e3 07 49 39 c3 0f 8c 1a ff ff ff eb 94 48 89 c3 eb a2 4c 89 c8 eb 85 90 <55> 89 f6 31 d2 48 89 e5 48 8b 4d 08 e8 3f fe ff ff 5d c3 0f 1f 
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.936 msecs