INFO: task syz.3.557:6894 blocked for more than 432 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.557       state:D stack:0     pid:6894  tgid:6892  ppid:4521   task_flags:0x40044c flags:0x00000003
Call Trace:
[<ffffffff8653d390>] context_switch kernel/sched/core.c:5325 [inline]
[<ffffffff8653d390>] __schedule+0x1042/0x4114 kernel/sched/core.c:6929
[<ffffffff86540526>] __schedule_loop kernel/sched/core.c:7011 [inline]
[<ffffffff86540526>] schedule+0xc4/0x35e kernel/sched/core.c:7026
[<ffffffff86540ea8>] schedule_preempt_disabled+0x16/0x28 kernel/sched/core.c:7083
[<ffffffff8654c1a8>] rwsem_down_read_slowpath+0x58c/0x9f4 kernel/locking/rwsem.c:1086
[<ffffffff8654c6f4>] __down_read_common kernel/locking/rwsem.c:1261 [inline]
[<ffffffff8654c6f4>] __down_read kernel/locking/rwsem.c:1274 [inline]
[<ffffffff8654c6f4>] down_read+0xe4/0x460 kernel/locking/rwsem.c:1539
[<ffffffff8015dc36>] mmap_read_lock include/linux/mmap_lock.h:368 [inline]
[<ffffffff8015dc36>] exit_mm kernel/exit.c:558 [inline]
[<ffffffff8015dc36>] do_exit+0x6c2/0x28e4 kernel/exit.c:954
[<ffffffff801603b8>] do_group_exit+0xd4/0x26c kernel/exit.c:1107