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RE: How to simulate journal corruption

To: <sandeen@xxxxxxxxxxx>, <olaf@xxxxxxx>
Subject: RE: How to simulate journal corruption
From: crow al <al-john@xxxxxxxxxxx>
Date: Tue, 14 Jul 2009 10:08:28 +0800
Cc: <xfs@xxxxxxxxxxx>
Importance: Normal
In-reply-to: <4A5B4833.9070300@xxxxxxxxxxx>
References: <SNT109-W2390816D3EF297CE0D07DEEC220@xxxxxxx> <4A5B4833.9070300@xxxxxxxxxxx>
Hi, Olaf & Eric

Thanks for your kindly reply. I will try your suggestions & if there is any interesting findings, I will let your know

Thanks & Regards.
Lv Wentao.

> Date: Mon, 13 Jul 2009 09:44:03 -0500
> From: sandeen@xxxxxxxxxxx
> To: al-john@xxxxxxxxxxx
> CC: xfs@xxxxxxxxxxx
> Subject: Re: How to simulate journal corruption
> crow al wrote:
> > Hi, there
> >
> > I'm a QA engineer from Cisco. I'm working on a test case concerning XFS
> > journal playback failure, which needs to manually inject error to XFS.
> >
> > I did some google work but get no luck. Then I think maybe XFA-QA could
> > give me some advice. That why I come to here.
> >
> > Is there anyone could tell me how to inject error into XFS or is there
> > any tool could be used?
> >
> > Wish for your response.
> >
> > Thanks & Regards.
> > Lv Wentao.
> test 044 in xfstests runs something called "loggen" which will generate
> log traffic to be replayed on mount, if I'm reading it right. Of course
> that's an uncorrupted log ...
> There is another tool called "fsfuzzer" which writes random junk over a
> filesystem. You could probably combine the two tools to create valid
> logs to replay, and then write varying degrees of junk on top with
> fsfuzzer, and try to replay the result.
> You could probably even use fsfuzzer "stock" and just restrict the
> fuzzing to the log portion of the filesystem.
> I'm not sure what kinds of errors you are trying to catch - oopses,
> hangs, improperly replaying a corrupted log, etc - but it sounds well
> worth doing. FWIW when I used fsfuzzer, it often ran into problems in
> the log, so I imagine you'll uncover some interesting things; if you do,
> please share. :)
> -Eric

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