rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10522 ticks this GP) idle=e944/1/0x4000000000000000 softirq=0/0 fqs=5170 rcuc=10524 jiffies(starved)
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     8445         49          175
rcu: 	cputime:      227          5        52092   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=26669 q=6761 ncpus=2)
CPU: 1 UID: 0 PID: 6670 Comm: syz.1.170 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:preempt_count_add+0xcb/0x190 kernel/sched/core.c:5877
Code: 35 32 3c 06 11 49 81 c6 d8 15 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 fd 62 9c 00 49 89 1e 5b 41 5e 41 5f <c3> cc cc cc cc cc 89 fb 90 e8 07 00 21 03 85 c0 74 30 48 c7 c0 44
RSP: 0018:ffffc900048a7720 EFLAGS: 00000246
RAX: 1ffff11005d8469b RBX: 00000000000055f1 RCX: ffffffff99a57500
RDX: 000000000000013f RSI: ffffffff8bac2160 RDI: ffffffff8b3906b5
RBP: 0000000000000001 R08: ffffffff8faeccf7 R09: 1ffffffff1f5d99e
R10: dffffc0000000000 R11: ffffffff8b390650 R12: ffff8880314c4930
R13: 1ffff110055a82c0 R14: 0000013f9363917f R15: 0000000000001532
FS:  0000000000000000(0000) GS:ffff888125d7e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f08a38172fc CR3: 000000003a20e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 delay_tsc+0x65/0xc0 arch/x86/lib/delay.c:79
 udelay include/asm-generic/delay.h:62 [inline]
 snd_timer_close_locked+0x3f6/0x9f0 sound/core/timer.c:454
 snd_timer_close+0x44/0xc0 sound/core/timer.c:487
 snd_seq_timer_close+0x96/0xd0 sound/core/seq/seq_timer.c:311
 queue_delete sound/core/seq/seq_queue.c:126 [inline]
 snd_seq_queue_delete+0x8d/0xf0 sound/core/seq/seq_queue.c:188
 delete_seq_queue sound/core/seq/oss/seq_oss_init.c:371 [inline]
 snd_seq_oss_release+0x1e9/0x330 sound/core/seq/oss/seq_oss_init.c:416
 odev_release+0x56/0x80 sound/core/seq/oss/seq_oss.c:141
 __fput+0x461/0xa70 fs/file_table.c:510
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x70f/0x22c0 kernel/exit.c:1004
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1147
 get_signal+0x1284/0x1330 kernel/signal.c:3038
 arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0xa9/0x680 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf4578ce59
Code: Unable to access opcode bytes at 0x7fcf4578ce2f.
RSP: 002b:00007fcf44dee028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffe00 RBX: 00007fcf45a05fa0 RCX: 00007fcf4578ce59
RDX: 0000000000000000 RSI: 0000000000005101 RDI: 0000000000000007
RBP: 00007fcf45822d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcf45a06038 R14: 00007fcf45a05fa0 R15: 00007fffe4dca2e8
 </TASK>