rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9656/1:b..l P32/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=49033, q=1263143 ncpus=2)
task:kworker/1:0H    state:R  running task     stack:25328 pid:32    tgid:32    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_highpri snd_vmidi_output_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x16d9/0x5700 kernel/sched/core.c:7284
 preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7463
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 rt_mutex_wake_up_q kernel/locking/rtmutex.c:583 [inline]
 rt_mutex_slowunlock+0x6d3/0xa30 kernel/locking/rtmutex.c:1483
 rt_spin_unlock+0x10f/0x200 kernel/locking/spinlock_rt.c:84
 spin_unlock_irqrestore include/linux/spinlock_rt.h:141 [inline]
 class_spinlock_irqsave_destructor include/linux/spinlock.h:644 [inline]
 snd_rawmidi_transmit+0x94/0xc0 sound/core/rawmidi.c:1496
 snd_vmidi_output_work+0x1a5/0x3e0 sound/core/seq/seq_virmidi.c:152
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
task:syz.4.843       state:R  running task     stack:27272 pid:9656  tgid:9655  ppid:5581   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x16d9/0x5700 kernel/sched/core.c:7284
 preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7463
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
 _raw_spin_unlock_irqrestore+0x76/0x80 kernel/locking/spinlock.c:221
 task_rq_unlock kernel/sched/sched.h:1983 [inline]
 sched_core_update_cookie kernel/sched/core_sched.c:96 [inline]
 __sched_core_set+0x27e/0x430 kernel/sched/core_sched.c:126
 sched_core_share_pid+0x5e8/0x790 kernel/sched/core_sched.c:228
 __do_sys_prctl kernel/sys.c:2808 [inline]
 __se_sys_prctl+0x866/0x1910 kernel/sys.c:2534
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe0c4d1e559
RSP: 002b:00007fe0c2f76028 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00007fe0c4fa5fa0 RCX: 00007fe0c4d1e559
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000003e
RBP: 00007fe0c4db58b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe0c4fa6038 R14: 00007fe0c4fa5fa0 R15: 00007ffccbf93068
 </TASK>