linux-ext4 - [Bug 113041] mbcache NULL pointer dereference

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Date:	Wed, 27 Apr 2016 21:35:28 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 113041] mbcache NULL pointer dereference

https://bugzilla.kernel.org/show_bug.cgi?id=113041

Theodore Tso <tytso@....edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tytso@....edu

--- Comment #7 from Theodore Tso <tytso@....edu> ---
The comm field doesn't really matter all that much.  The crash is in the
mbcache slab shrinker, which gets called from the VM when the system us under
memory pressure.

It looks like the crash is in the extended attribute cache which is in turn
triggered by SELinux.   (As far as I know Cassandra doesn't use extended
attributes.)

Note that the 4.3.x kernel is not a long-term supported kernel, and it's no
longer automatically getting bug fixes ported to it, at least not in the
upstream.  If CoreOS is providing their own security updates, then you should
really ask them for support because this would be a distro-kernel that has
changes not seen or supported by usptream developers.

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