linux-ext4 - [Bug 15579] ext4 -o discard produces incorrect blocks of zeroes in newly created files under heavy read+truncate+append-new-file load

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Message-Id: <201003290817.o2T8HIKV010825@demeter.kernel.org>
Date:	Mon, 29 Mar 2010 08:17:18 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15579] ext4 -o discard produces incorrect blocks of zeroes in
 newly created files under heavy read+truncate+append-new-file load

https://bugzilla.kernel.org/show_bug.cgi?id=15579





--- Comment #8 from Andreas Beckmann <kernel-bugs@...ckmann.de>  2010-03-29 08:16:54 ---
(In reply to comment #7)
> If the number of available unmapped blocks has an impact, that seems most
> likely to be a SSD firmware bug to me.
> 
> ie. If the linux kernel is sending control messages in the wrong order, then it
> should cause corruption regardless of the number of unmapped blocks.

That's correct except that you may get a timing issue (e.g. writing to free
unmapped blocks is/could be/should be a bit faster than clearing the blocks
first) which could turn this into race condition debugging ...

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