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commitf63955721aupstream. We are not allowed to call pnfs_mark_matching_lsegs_return() without also holding a reference to the layout header, since doing so could lead to the reference count going to zero when we call pnfs_layout_remove_lseg(). This again can lead to a hang when we get to nfs4_evict_inode() and are unable to clear the layout pointer. pnfs_layout_return_unused_byserver() is guilty of this behaviour, and has been seen to trigger the refcount warning prior to a hang. Fixes:b6d49ecd10("NFSv4: Fix a pNFS layout related use-after-free race when freeing the inode") Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.