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Jens Axboe eb2de9418d io-wq: fix race around io_worker grabbing
There's a small window between lookup dropping the reference to the
worker and calling wake_up_process() on the worker task, where the worker
itself could have exited. We ensure that the worker struct itself is
valid, but worker->task may very well be gone by the time we issue the
wakeup.

Fix the race by using a completion triggered by the reference going to
zero, and having exit wait for that completion before proceeding.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
History 2021-02-23 20:33:41 -07:00
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Linux kernel
============

There are several guides for kernel developers and users. These guides can
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Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
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    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
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the problems which may result by upgrading your kernel.