Justin Husted 76e147d0a9 Fix refcount bug in blkdev and timer kthreads.
The shutdown code in d79d57e and b20e160 had a race condition during
shutdown, due to not owning a reference on the associated task_struct
while the associated threads shut themselves down.

Patch over this by taking an appropriate reference.

Signed-off-by: Justin Husted <sigstop@gmail.com>
2019-11-07 16:44:04 -08:00
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