Commit 61337054 introduced a circular lock dependency because
posix_cpu_timers_exit() is called by release_task(), which is holding
a writer lock on tasklist_lock, and this can cause a deadlock since
kill_fasync() gets called with nonblocking_pool.lock taken.

There's no reason why kill_fasync() needs to be taken while the random
pool is locked, so move it out to fix this locking dependency.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Reported-by: NRuss Dill <Russ.Dill@gmail.com>
Cc: stable@kernel.org