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Dan Aloni reports that when a server disconnects abruptly, a few memory regions are left DMA mapped. Over time this leak could pin enough I/O resources to slow or even deadlock an NFS/RDMA client. I found that if a transport disconnects before pending Send and FastReg WRs can be posted, the to-be-registered MRs are stranded on the req's rl_registered list and never released -- since they weren't posted, there's no Send completion to DMA unmap them. Reported-by: Dan Aloni <dan@kernelim.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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.