INFO: task syz.1.68:4095 blocked for more than 425 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.68        state:D stack:0     pid:4095  tgid:4090  ppid:3208   task_flags:0x40054c flags:0x00000002
Call Trace:
[<ffffffff8666de56>] context_switch kernel/sched/core.c:5256 [inline]
[<ffffffff8666de56>] __schedule+0x102c/0x451e kernel/sched/core.c:6863
[<ffffffff8667140c>] __schedule_loop kernel/sched/core.c:6945 [inline]
[<ffffffff8667140c>] schedule+0xc4/0x35e kernel/sched/core.c:6960
[<ffffffff866717a0>] schedule_preempt_disabled+0x16/0x28 kernel/sched/core.c:7017
[<ffffffff8667d130>] rwsem_down_read_slowpath+0x58c/0x9f4 kernel/locking/rwsem.c:1086
[<ffffffff8667d67c>] __down_read_common kernel/locking/rwsem.c:1261 [inline]
[<ffffffff8667d67c>] __down_read kernel/locking/rwsem.c:1274 [inline]
[<ffffffff8667d67c>] down_read+0xe4/0x460 kernel/locking/rwsem.c:1539
[<ffffffff8016099e>] mmap_read_lock include/linux/mmap_lock.h:391 [inline]
[<ffffffff8016099e>] exit_mm kernel/exit.c:557 [inline]
[<ffffffff8016099e>] do_exit+0x6da/0x28fc kernel/exit.c:959