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Date:	Wed, 10 Oct 2007 22:46:41 -0600
From:	Andreas Dilger <>
To:	"Aneesh Kumar K.V" <>
Cc:	linux-ext4 <>,
	Avantika Mathur <>
Subject: Re: uninit block group/mballoc and fsstress

On Oct 10, 2007  22:07 +0530, Aneesh Kumar K.V wrote:
> I am hitting this with  the below config
> mke2fs -j -I 256 -O lazy_bg $dev

Note that "-O lazy_bg" has nothing really to do with the uninit_groups
feature.  Also, if you don't have the CFS e2fsprogs patches for
uninit_groups then mke2fs creates an invalid filesystem if the journal is
large (this was an unrelated bug we fixed while testing uninit_groups).
Try running e2fsck right after the above mke2fs and you will likely
see errors.

> jbd2_journal_bmap: journal block not found at offset 31780 on sda7

The problem is that lazy_bg allocates the journal blocks incorrectly, IIRC.

Cheers, Andreas
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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