d22f69a08d
When the gfs2_logd daemon withdrew, the withdraw sequence called into make_fs_ro() to make the file system read-only. That caused the journal descriptors to be freed. However, those journal descriptors were used by gfs2_logd's call to gfs2_ail_flush_reqd(). This caused a use-after free and NULL pointer dereference. This patch changes function gfs2_logd() so that it stops all logd work until the thread is told to stop. Once a withdraw is done, it only does an interruptible sleep. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.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.