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d4f1d5f7a4
When nvme_cancel_tagset traverses all tagsets and executes nvme_cancel_request, this request may be executing blk_mq_free_request that is called by nvme_rdma_complete_timed_out/nvme_tcp_complete_timed_out. When blk_mq_free_request executes to WRITE_ONCE(rq->state, MQ_RQ_IDLE) and __blk_mq_free_request(rq), it will cause double blk_mq_complete_request for this request, and it will cause a null pointer error in the second execution of this function because rq->mq_hctx has set to NULL in first execution. Signed-off-by: Lei Yin <yinlei2@lenovo.com> Reviewed-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> |
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README |
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.