From: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Date: Mon, 24 Sep 2012 02:49:12 +0000 (-0400)
Subject: ext4: fix crash when accessing /proc/mounts concurrently
X-Git-Tag: v3.7-rc1~91^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=50df9fd55e4271e89a7adf3b1172083dd0ca199d;p=pandora-kernel.git

ext4: fix crash when accessing /proc/mounts concurrently

The crash was caused by a variable being erronously declared static in
token2str().

In addition to /proc/mounts, the problem can also be easily replicated
by accessing /proc/fs/ext4/<partition>/options in parallel:

$ cat /proc/fs/ext4/<partition>/options > options.txt

... and then running the following command in two different terminals:

$ while diff /proc/fs/ext4/<partition>/options options.txt; do true; done

This is also the cause of the following a crash while running xfstests
#234, as reported in the following bug reports:

	https://bugs.launchpad.net/bugs/1053019
	https://bugzilla.kernel.org/show_bug.cgi?id=47731

Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Brad Figg <brad.figg@canonical.com>
Cc: stable@vger.kernel.org
---

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