rcu: INFO: rcu_sched self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=c3a/1/0x4000000000000002 softirq=21039/21039 fqs=5075 
	(t=10500 jiffies g=26737 q=1869)
NMI backtrace for cpu 0
CPU: 0 PID: 12299 Comm: syz-executor.5 Not tainted 5.2.0+ #64
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+0x16f/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x22d/0x25c 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:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2736 [inline]
 rcu_sched_clock_irq.cold+0x491/0x8c0 kernel/rcu/tree.c:2183
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1296
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x364/0xd90 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x2ea/0x730 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1068 [inline]
 smp_apic_timer_interrupt+0x10b/0x550 arch/x86/kernel/apic/apic.c:1093
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x91/0xd0 kernel/locking/spinlock.c:191
Code: 48 c7 c0 90 e3 d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 32 48 83 3d 46 64 a0 01 00 74 16 48 89 df 57 9d <0f> 1f 44 00 00 65 ff 0d 2b 7e cf 78 5b 41 5c 5d c3 0f 0b 0f 0b 48
RSP: 0018:ffff8880a3c07b40 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5c72 RBX: 0000000000000282 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: ffff8880a3c07b50 R08: 1ffffffff14a6d58 R09: fffffbfff14a6d59
R10: fffffbfff14a6d58 R11: ffffffff8a536ac7 R12: ffffffff89708260
R13: 0000000000000282 R14: 1ffff11014780f80 R15: ffff8880a3c07c60
 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline]
 queueptr+0x99/0xb0 sound/core/seq/seq_queue.c:214
 snd_seq_enqueue_event+0x64/0x4c0 sound/core/seq/seq_queue.c:294
 snd_seq_client_enqueue_event.constprop.0+0x259/0x470 sound/core/seq/seq_clientmgr.c:974
 snd_seq_write+0x40b/0x740 sound/core/seq/seq_clientmgr.c:1093
 __vfs_write+0x8a/0x110 fs/read_write.c:494
 vfs_write+0x268/0x5d0 fs/read_write.c:558
 ksys_write+0x220/0x290 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:620
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5afdb57c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 00000000ffffff76 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5afdb586d4
R13: 00000000004c98c0 R14: 00000000004e0d38 R15: 00000000ffffffff