linux-ext4 - Re: xfstests failures w/ metadata

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Date:	Mon, 1 Dec 2014 17:05:34 -0500
From:	Eric Whitney <enwlinux@...il.com>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	Eric Whitney <enwlinux@...il.com>, linux-ext4@...r.kernel.org
Subject: Re: xfstests failures w/ metadata_csum

* Darrick J. Wong <darrick.wong@...cle.com>:
> Hi Eric,
> 
> Could you remind me which xfstests are failing in 3.18-rc3+ with metadata_csum
> enabled?  I think you said generic/034, generic/321, and generic/322, but were
> there more?

Hi Darrick:

The other failing test is generic/325 - you've got the others right.  Note that
I may be an xfstests version ahead of xfstests-bld, so depending on what you're
running, you may not see all of those.  (Gonna stick closer to xfstests-bld
from now on.)  The failures are the same in the inline data test scenario.

Thanks for looking at this!

Eric

> 
> AFAICT the ext4 mount fails because it can't load the journal, and the journal
> can't replay because jbd2_descr_block_csum_verify() fails; the 034 test appears
> to drop all the writes related to the umount.  recovery.c doesn't say anything
> when the journal descriptor block fails csum verification, though it should.
> Not sure why we end up with corrupt-looking descriptor blocks.
> 
> The reason why this appears in -rc3 is because that's when we added the patch
> that forces journal_checksum on whenever metadata_csum is on, and I guess
> few people were testing journal_checksum with xfstests before that.
> 
> --D
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