On Fri, Sep 21, 2012 at 10:21:00PM -0300, Herton Ronaldo Krzesinski wrote:
> There is no reason to use static there, and it will cause issues when
> reading /proc/fs/ext4/<partition>/options concurrently.
>
> Signed-off-by: Herton Ronaldo Krzesinski <[email protected]>
> Cc: [email protected] # 3.4+
Herton,
Thanks for finding the bug fix! I changed the commit descipription
slightly and have applied your patch to the ext4 tree.
- Ted
ext4: fix crash when accessing /proc/mounts concurrently
From: Herton Ronaldo Krzesinski <[email protected]>
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 <[email protected]>
Signed-off-by: "Theodore Ts'o" <[email protected]>
Cc: Brad Figg <[email protected]>
Cc: [email protected]
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