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In some rare failure modes, the server is actually reading the transport, but then just dropping the requests on the floor. TCP_USER_TIMEOUT cannot detect that case. Prevent such a stuck server from pinning client resources indefinitely by ensuring that certain idempotent requests (such as NULL) can time out even if the connection is still operational. Otherwise rpc_bind_new_program(), gss_destroy_cred(), or rpc_clnt_test_and_add_xprt() can wait forever. 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.