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9ebbfe495e
Each name space has a request queue, if complete request long time, multi request queues may have time out requests at the same time, nvme_tcp_timeout will execute concurrently. Multi requests in different request queues may be queued in the same tcp queue, multi nvme_tcp_timeout may call nvme_tcp_stop_queue at the same time. The first nvme_tcp_stop_queue will clear NVME_TCP_Q_LIVE and continue stopping the tcp queue(cancel io_work), but the others check NVME_TCP_Q_LIVE is already cleared, and then directly complete the requests, complete request before the io work is completely canceled may lead to a use-after-free condition. Add a multex lock to serialize nvme_tcp_stop_queue. Signed-off-by: Chao Leng <lengchao@huawei.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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.