linux-ext4 - Re: [PATCH] ext4: initialize multi-block allocator before checking block descriptors

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Date:	Sat, 15 Mar 2014 22:38:41 -0400
From:	tytso@....edu
To:	Azat Khuzhin <a3at.mail@...il.com>
Cc:	"open list:EXT4 FILE SYSTEM" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4: initialize multi-block allocator before checking
 block descriptors

On Sun, Mar 16, 2014 at 03:54:34AM +0400, Azat Khuzhin wrote:
> 
> Thanks Ted, I'll take a look.
> Are you talking about xfs-tests failures?

Yes, the kernel is complaining that the file system looks corrupt.
The xfstest generic/001 is the easist one to trigger it:

generic/001 18s ...	[17:35:49][   26.793766] EXT4-fs error (device vde): ext4_mb_generate_buddy:756: group 1, 32763 clusters in bitmap, 32764 
in gd; block bitmap corrupt.
 [17:36:09] 20s
[   39.636943] EXT4-fs (vde): warning: mounting fs with errors, running e2fsck is recommended

I this was using a freshly generated file system using a 20 GiB test
partition, formatted using:

	   mke2fs -t ext4 -O bigalloc /dev/vde

Dropping the patch made the error go away.

Cheers,

					- Ted
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