INFO: task syz.4.321:6559 blocked for more than 443 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.321       state:D stack:0     pid:6559  tgid:6558  ppid:5249   task_flags:0x40044c flags:0x00000002
Call Trace:
[<ffffffff86544f00>] context_switch kernel/sched/core.c:5325 [inline]
[<ffffffff86544f00>] __schedule+0x1042/0x4114 kernel/sched/core.c:6929
[<ffffffff86548096>] __schedule_loop kernel/sched/core.c:7011 [inline]
[<ffffffff86548096>] schedule+0xc4/0x35e kernel/sched/core.c:7026
[<ffffffff86548a18>] schedule_preempt_disabled+0x16/0x28 kernel/sched/core.c:7083
[<ffffffff86553d18>] rwsem_down_read_slowpath+0x58c/0x9f4 kernel/locking/rwsem.c:1086
[<ffffffff86554264>] __down_read_common kernel/locking/rwsem.c:1261 [inline]
[<ffffffff86554264>] __down_read kernel/locking/rwsem.c:1274 [inline]
[<ffffffff86554264>] down_read+0xe4/0x460 kernel/locking/rwsem.c:1539
[<ffffffff8015ed4e>] mmap_read_lock include/linux/mmap_lock.h:368 [inline]
[<ffffffff8015ed4e>] exit_mm kernel/exit.c:558 [inline]
[<ffffffff8015ed4e>] do_exit+0x6c2/0x28e4 kernel/exit.c:954
[<ffffffff801614d0>] do_group_exit+0xd4/0x26c kernel/exit.c:1107
[<ffffffff8019a8d0>] get_signal+0x2076/0x22f8 kernel/signal.c:3034
[<ffffffff80071cd0>] arch_do_signal_or_restart+0x738/0x1c4e arch/riscv/kernel/signal.c:534
[<ffffffff803c2f24>] exit_to_user_mode_loop+0x8a/0x142 kernel/entry/common.c:40
[<ffffffff8653a590>] exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
[<ffffffff8653a590>] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
[<ffffffff8653a590>] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
[<ffffffff8653a590>] do_trap_ecall_u+0x3f8/0x53a arch/riscv/kernel/traps.c:357
[<ffffffff86563eae>] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232

Showing all locks held in the system:
1 lock held by kthreadd/2:
7 locks held by kworker/0:1/10:
1 lock held by khungtaskd/33:
 #0: ffffffff885df920 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2a/0x1a0 kernel/locking/lockdep.c:6771
5 locks held by kworker/u8:7/1994:
1 lock held by klogd/3015:
2 locks held by dhcpcd/3058:
1 lock held by dhcpcd/3060:
2 locks held by getty/3167: