rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10525 ticks this GP) idle=3b1/1/0x4000000000000000 softirq=299466/299468 fqs=5216 
	(t=10502 jiffies g=526181 q=2207)
NMI backtrace for cpu 1
CPU: 1 PID: 18402 Comm: syz-executor.3 Not tainted 5.15.0-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+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 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:3878 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 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>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:strlen+0x54/0x90 lib/string.c:487
Code: 75 48 80 7d 00 00 74 39 48 bb 00 00 00 00 00 fc ff df 48 89 e8 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a <38> ca 7f 04 84 d2 75 1f 80 38 00 75 de 48 83 c4 08 48 29 e8 5b 5d
RSP: 0018:ffffc90019017b28 EFLAGS: 00000206
RAX: ffffffff898a5cad RBX: dffffc0000000000 RCX: 0000000000000005
RDX: 0000000000000007 RSI: ffff888031392428 RDI: ffffffff898a5ca0
RBP: ffffffff898a5ca0 R08: 0000000000000000 R09: ffffffff8d6fc457
R10: fffffbfff1adf88a R11: 0000000000000000 R12: ffff888031392428
R13: ffffffff8b880d20 R14: ffff888031392428 R15: ffffc90019017bf8
 strlen include/linux/fortify-string.h:102 [inline]
 trace_event_get_offsets_lock include/trace/events/lock.h:39 [inline]
 perf_trace_lock+0xb1/0x4d0 include/trace/events/lock.h:39
 trace_lock_release include/trace/events/lock.h:58 [inline]
 lock_release+0x4a8/0x720 kernel/locking/lockdep.c:5651
 __might_fault mm/memory.c:5253 [inline]
 __might_fault+0x142/0x170 mm/memory.c:5238
 _copy_from_user+0x27/0x180 lib/usercopy.c:13
 copy_from_user include/linux/uaccess.h:192 [inline]
 snd_seq_write+0x40b/0x690 sound/core/seq/seq_clientmgr.c:1055
 vfs_write+0x28e/0xae0 fs/read_write.c:588
 ksys_write+0x1ee/0x250 fs/read_write.c:643
 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: 0033:0x7f34913a7ae9
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:00007f348e91d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f34914baf60 RCX: 00007f34913a7ae9
RDX: 00000000fffffee4 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007f3491401f25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f34919eeb2f R14: 00007f348e91d300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	75 48                	jne    0x4a
   2:	80 7d 00 00          	cmpb   $0x0,0x0(%rbp)
   6:	74 39                	je     0x41
   8:	48 bb 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbx
   f:	fc ff df
  12:	48 89 e8             	mov    %rbp,%rax
  15:	48 83 c0 01          	add    $0x1,%rax
  19:	48 89 c2             	mov    %rax,%rdx
  1c:	48 89 c1             	mov    %rax,%rcx
  1f:	48 c1 ea 03          	shr    $0x3,%rdx
  23:	83 e1 07             	and    $0x7,%ecx
  26:	0f b6 14 1a          	movzbl (%rdx,%rbx,1),%edx
* 2a:	38 ca                	cmp    %cl,%dl <-- trapping instruction
  2c:	7f 04                	jg     0x32
  2e:	84 d2                	test   %dl,%dl
  30:	75 1f                	jne    0x51
  32:	80 38 00             	cmpb   $0x0,(%rax)
  35:	75 de                	jne    0x15
  37:	48 83 c4 08          	add    $0x8,%rsp
  3b:	48 29 e8             	sub    %rbp,%rax
  3e:	5b                   	pop    %rbx
  3f:	5d                   	pop    %rbp