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[ Upstream commit71e1cef2d7] While task_work_add() in io_workqueue_create() is true, then duplicate code is executed: -> clear_bit_unlock(0, &worker->create_state); -> io_worker_release(worker); -> atomic_dec(&acct->nr_running); -> io_worker_ref_put(wq); -> return false; -> clear_bit_unlock(0, &worker->create_state); // back to io_workqueue_create() -> io_worker_release(worker); -> kfree(worker); The io_worker_release() and clear_bit_unlock() are executed twice. Fixes:3146cba99a("io-wq: make worker creation resilient against signals") Signed-off-by: Bixuan Cui <cuibixuan@huawei.com> Link: https://lore.kernel.org/r/20210911085847.34849-1-cuibixuan@huawei.com Reviwed-by: Hao Xu <haoxu@linux.alibaba.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.