INFO: task syz-executor.1:4926 blocked for more than 430 seconds.
      Not tainted 5.13.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:    0 pid: 4926 ppid:  3244 flags:0x00000004
Call Trace:
[<ffffffff82b1cf6c>] context_switch kernel/sched/core.c:4339 [inline]
[<ffffffff82b1cf6c>] __schedule+0x480/0xf60 kernel/sched/core.c:5147
[<ffffffff82b1dab0>] schedule+0x64/0x166 kernel/sched/core.c:5226
[<ffffffff82b1e30c>] schedule_preempt_disabled+0x16/0x28 kernel/sched/core.c:5285
[<ffffffff82b20008>] __mutex_lock_common kernel/locking/mutex.c:1026 [inline]
[<ffffffff82b20008>] __mutex_lock+0x4a8/0x99e kernel/locking/mutex.c:1096
[<ffffffff82b20512>] mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:1111
[<ffffffff8029c066>] perf_event_exit_task_context kernel/events/core.c:12624 [inline]
[<ffffffff8029c066>] perf_event_exit_task+0x1b2/0x386 kernel/events/core.c:12690
[<ffffffff80033494>] do_exit+0x77a/0x1846 kernel/exit.c:835
[<ffffffff8003466a>] do_group_exit+0xa0/0x198 kernel/exit.c:923
[<ffffffff8004de54>] get_signal+0x31e/0x1428 kernel/signal.c:2818
[<ffffffff80007eba>] do_signal arch/riscv/kernel/signal.c:271 [inline]
[<ffffffff80007eba>] do_notify_resume+0xa8/0x930 arch/riscv/kernel/signal.c:317
[<ffffffff8000563a>] ret_from_exception+0x0/0x14

Showing all locks held in the system:
5 locks held by kworker/0:0/5:
1 lock held by khungtaskd/910:
 #0: ffffffff8432a7e8 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x32/0x1fa kernel/locking/lockdep.c:6335
1 lock held by klogd/2870:
2 locks held by getty/3040:
 #0: ffffffe00b795098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x48 drivers/tty/tty_ldsem.c:340
 #1: ffffffd010ac42e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x9ac/0xb08 drivers/tty/n_tty.c:2179
3 locks held by kworker/1:4/3451:
1 lock held by syz-executor.1/4925:
1 lock held by syz-executor.1/4926:
 #0: ffffffe00f7220b0 (&ctx->mutex){+.+.}-{3:3}, at: perf_event_exit_task_context kernel/events/core.c:12624 [inline]
 #0: ffffffe00f7220b0 (&ctx->mutex){+.+.}-{3:3}, at: perf_event_exit_task+0x1b2/0x386 kernel/events/core.c:12690

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