rcu: INFO: rcu_sched self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=072/1/0x4000000000000002 softirq=122979/122979 fqs=5242 
	(t=10500 jiffies g=210765 q=606)
NMI backtrace for cpu 1
CPU: 1 PID: 22590 Comm: syz-executor.2 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:lock_release+0x4c0/0x950 /kernel/locking/lockdep.c:4435
Code: 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 65 03 00 00 48 83 3d 1f a8 7a 07 00 0f 84 69 01 00 00 48 8b bd 48 ff ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00
RSP: 0018:ffff888054fcf730 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5c72 RBX: 1ffff1100a9f9eeb RCX: 1ffff1100bbc2d78
RDX: dffffc0000000000 RSI: 1ffff1100bbc2d7f RDI: 0000000000000282
RBP: ffff888054fcf800 R08: 0000000000000002 R09: ffff88805de16bc8
R10: fffffbfff13494e7 R11: ffffffff89a4a73f R12: ffff88805de16380
R13: ffffffff8570006c R14: ffff888054fcf7d8 R15: ffff88805de16380
 __raw_read_unlock /./include/linux/rwlock_api_smp.h:225 [inline]
 _raw_read_unlock+0x1b/0x30 /kernel/locking/spinlock.c:255
 snd_seq_port_use_ptr+0x17c/0x1b0 /sound/core/seq/seq_ports.c:57
 snd_seq_deliver_single_event.constprop.0+0x1d6/0x890 /sound/core/seq/seq_clientmgr.c:615
 snd_seq_deliver_event+0x57f/0x8d0 /sound/core/seq/seq_clientmgr.c:839
 snd_seq_dispatch_event+0x131/0x5b0 /sound/core/seq/seq_clientmgr.c:913
 snd_seq_check_queue.part.0+0x139/0x360 /sound/core/seq/seq_queue.c:262
 snd_seq_check_queue /sound/core/seq/seq_queue.c:242 [inline]
 snd_seq_enqueue_event+0x1fb/0x4c0 /sound/core/seq/seq_queue.c:330
 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:00007f8bf59f7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 00000000ffffff76 RSI: 0000000020000000 RDI: 0000000000000008
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8bf59f86d4
R13: 00000000004c98c0 R14: 00000000004e0d38 R15: 00000000ffffffff