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.
Matthew Wilcox (Oracle)
authored
If a read races with an invalidation followed by another read, it is possible for a folio to be replaced with a higher-order folio. If that happens, we'll see a sibling entry for the new folio in the next iteration of the loop. This manifests as a NULL pointer dereference while holding the RCU read lock. Handle this by simply returning. The next call will find the new folio and handle it correctly. The other ways of handling this rare race are more complex and it's just not worth it. Reported-by:Dave Chinner <david@fromorbit.com> Reported-by:
Brian Foster <bfoster@redhat.com> Debugged-by:
Brian Foster <bfoster@redhat.com> Tested-by:
Brian Foster <bfoster@redhat.com> Reviewed-by:
Brian Foster <bfoster@redhat.com> Fixes: cbd59c48 ("mm/filemap: use head pages in generic_file_buffered_read") Cc: stable@vger.kernel.org Signed-off-by:
Matthew Wilcox (Oracle) <willy@infradead.org>
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