linux-ext4 - [Bug 16165] Wrong data returned on read after write if file size was changed with ftruncate before

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Message-Id: <201006111426.o5BEQtxh004828@demeter.kernel.org>
Date:	Fri, 11 Jun 2010 14:26:55 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 16165] Wrong data returned on read after write if file size was
 changed with ftruncate before

https://bugzilla.kernel.org/show_bug.cgi?id=16165


Frank Mehnert <frank.mehnert@....com> changed:

           What    |Removed                     |Added
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                 CC|                            |frank.mehnert@....com




--- Comment #9 from Frank Mehnert <frank.mehnert@....com>  2010-06-11 14:26:51 ---
When compiling the test case, please make sure to add a third parameter to
open(), for example 0777, otherwise it wouldn't compile on Ubuntu (O_CREAT
requires 3 parameters for open).

Executed the testcase here on an up-to-date Ubuntu 10.04 installed on an
ext4-formatted partition. The testcase does NOT fail if the test file already
exists. But it fails about 130 out of 500 times if I remove the test file prior
to each run. When using Linux 2.6.34 vanilla: 7080 out of 10000 runs reported a
corrupted buffer. And, like expected, the test never fails on an ext3
partition.

So please make sure to run the testcase like this:

# for i in `seq 1 500`; do rm -f /mnt/tst; ./aio_corrupt /mnt/tst; done

where /mnt is an ext4 partition.

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