rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=747/1/0x4000000000000000 softirq=14573/14573 fqs=4993 
	(t=10500 jiffies g=12301 q=218361)
NMI backtrace for cpu 1
CPU: 1 PID: 12482 Comm: syz-executor.2 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x30/0xc0 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x11a/0x160 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3880 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2599
 update_process_times+0x13b/0x1c0 kernel/time/timer.c:1785
 tick_sched_handle+0x6f/0x130 kernel/time/tick-sched.c:226
 tick_sched_timer+0x132/0x210 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x18a/0xb00 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x2f5/0x780 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 5a 47 18 f9 48 89 ef e8 a2 bd 18 f9 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 53 a1 0b f9 65 8b 05 5c 32 c6 77 85 c0 74 0a 5b 5d c3 e8 d0 f2
RSP: 0018:ffffc9000d837a88 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1d2d93e
RDX: 0000000000000000 RSI: ffffffff888b4c60 RDI: 0000000000000001
RBP: ffff888058ad2488 R08: 0000000000000001 R09: ffffffff8e8f7b37
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880489b5d28
R13: 0000000000000000 R14: ffff8880489b5d00 R15: ffff888058ad2488
 spin_unlock_irqrestore include/linux/spinlock.h:418 [inline]
 snd_seq_cell_alloc.constprop.0+0x2ab/0x560 sound/core/seq/seq_memory.c:271
 snd_seq_event_dup+0x126/0x870 sound/core/seq/seq_memory.c:300
 snd_seq_client_enqueue_event.constprop.0+0x19a/0x3c0 sound/core/seq/seq_clientmgr.c:970
 snd_seq_write+0x2db/0x510 sound/core/seq/seq_clientmgr.c:1096
 vfs_write+0x1c4/0x900 fs/read_write.c:592
 ksys_write+0x171/0x1d0 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fae27d76ae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fae274cb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fae27e8a020 RCX: 00007fae27d76ae9
RDX: 00000000fffffee4 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007fae27dd0f25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffceeb24baf R14: 00007fae274cb300 R15: 0000000000022000
----------------
Code disassembly (best guess):
   0:	74 24                	je     0x26
   2:	10 e8                	adc    %ch,%al
   4:	5a                   	pop    %rdx
   5:	47 18 f9             	rex.RXB sbb %r15b,%r9b
   8:	48 89 ef             	mov    %rbp,%rdi
   b:	e8 a2 bd 18 f9       	callq  0xf918bdb2
  10:	81 e3 00 02 00 00    	and    $0x200,%ebx
  16:	75 25                	jne    0x3d
  18:	9c                   	pushfq
  19:	58                   	pop    %rax
  1a:	f6 c4 02             	test   $0x2,%ah
  1d:	75 2d                	jne    0x4c
  1f:	48 85 db             	test   %rbx,%rbx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 53 a1 0b f9       	callq  0xf90ba182 <-- trapping instruction
  2f:	65 8b 05 5c 32 c6 77 	mov    %gs:0x77c6325c(%rip),%eax        # 0x77c63292
  36:	85 c0                	test   %eax,%eax
  38:	74 0a                	je     0x44
  3a:	5b                   	pop    %rbx
  3b:	5d                   	pop    %rbp
  3c:	c3                   	retq
  3d:	e8                   	.byte 0xe8
  3e:	d0 f2                	shl    %dl