110aa25c3c
We use a bit to manage if we need to add the shared task_work, but a list + lock for the pending work. Before aborting a current run of the task_work we check if the list is empty, but we do so without grabbing the lock that protects it. This can lead to races where we think we have nothing left to run, where in practice we could be racing with a task adding new work to the list. If we do hit that race condition, we could be left with work items that need processing, but the shared task_work is not active. Ensure that we grab the lock before checking if the list is empty, so we know if it's safe to exit the run or not. Link: https://lore.kernel.org/io-uring/c6bd5987-e9ae-cd02-49d0-1b3ac1ef65b1@tnonline.net/ Cc: stable@vger.kernel.org # 5.11+ Reported-by: Forza <forza@tnonline.net> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
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
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.