linux-kernel - Re: Nature of ext4 corruption fixed by recent patch?

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Message-ID: <20150521032448.GA14632@x>
Date:	Wed, 20 May 2015 20:24:48 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Theodore Ts'o <tytso@....edu>, Lukas Czerner <lczerner@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Nature of ext4 corruption fixed by recent patch?

On Wed, May 20, 2015 at 10:23:22PM -0300, Henrique de Moraes Holschuh wrote:
> On Wed, 20 May 2015, josh@...htriplett.org wrote:
> > md-based RAID0, on top of a pair of SSDs.
> 
> Might this be it?  It was mentioned in another, more recent thread about
> data loss involving md-raid0 and ssds...
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=98501

That looks extremely likely, particularly since I do have the "discard"
option enabled.  And discarding the wrong blocks seems entirely
consistent with the symptoms I've observed.

Thanks!  I'll disable discard as a short-term workaround until that
change goes into the Debian kernel.

- Josh Triplett
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