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92311f8dfd
commit 829451beaed6165eb11d7a9fb4e28eb17f489980 upstream. There's a tiny race condition in dm-mirror. The functions queue_bio and write_callback grab a spinlock, add a bio to the list, drop the spinlock and wake up the mirrord thread that processes bios in the list. It may be possible that the mirrord thread processes the bio just after spin_unlock_irqrestore is called, before wakeup_mirrord. This spurious wake-up is normally harmless, however if the device mapper device is unloaded just after the bio was processed, it may be possible that wakeup_mirrord(ms) uses invalid "ms" pointer. Fix this bug by moving wakeup_mirrord inside the spinlock. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| README | ||
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.