linux-ext4 - Re: shared/289 failures on metadata

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Date:	Tue, 11 Mar 2014 17:20:48 -0400
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: shared/289 failures on metadata_csum, e2fsprogs master branch

* Darrick J. Wong <darrick.wong@...cle.com>:
> On Tue, Mar 11, 2014 at 03:38:19PM -0400, Eric Whitney wrote:
> > Xfstest shared/289 fails when run on an ext4 test filesystem created with
> > the metadata_csum and 64bit options and using executables from the latest
> > e2fsprogs master branch (46d2a26683).  I've seen the problem on kernel
> > versions from 3.14-rc1 through 3.14-rc6, but I think this is an e2fsprogs
> > regression rather than a kernel problem.
> > 
> > The failing portion of shared/289 can be boiled down to:
> > 
> > mkfs.ext4 -O metadata_csum,64bit /dev/vdc
> > dumpe2fs -h /dev/vdc 2>/dev/null | awk '/Free blocks:/{print $3}'
> > 
> > The problem (in my test config) is that the reported free block value is
> > 184684916231 (much larger than my test device) where the reported block
> > count is 1382400 (much saner).
> > 
> > The bug appears to have been introduced between two merges of the maint
> > branch: 72958b6670 (good - 10 Jan) and f0996c12d5 (bad - 30 Jan).  Some
> > weeks ago, I thought I'd bisected the problem to a specific patch
> > (8e44eb64bb - libext2fs: mark group data blocks when loading block bitmap),
> > which seemed like a plausible candidate.  However, I find I can't
> > reproduce the bisection now, as e2fsprogs doesn't want to support the
> > metadata_csum, 64bit options during bisection in the master branch (that'll
> > teach me for not mentioning this earlier... :-) ).
> 
> This is fixed by patch #17 ("libext2fs: fix 64bit overflow in
> ext2fs_block_alloc_stats_range") in the patchbomb I sent out earlier today.
> 

Works for me.

Thanks!
Eric


> --D
> > 
> > Thanks,
> > Eric
> > --
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