linux-ext4 - Re: EXT4-fs: group descriptors corrupted!

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Message-ID: <49A5BC63.9030104@cox.net>
Date:	Wed, 25 Feb 2009 15:47:15 -0600
From:	Ron Johnson <ron.l.johnson@....net>
To:	Linux-Ext4 <linux-ext4@...r.kernel.org>
Subject: Re: EXT4-fs: group descriptors corrupted!

On 02/25/2009 03:30 PM, Theodore Tso wrote:
> On Wed, Feb 25, 2009 at 02:39:31PM -0600, Ron Johnson wrote:
>> These are the relevant Debian Sid package versions:
>> e2fsprogs                1.41.3-1
>> linux-source-2.6.28      2.6.28-2~snapshot.12850
>>
>> Since I built the fs with extents enabled, I am hesitant to run fsck on 
>> it because I've read that it doesn't yet support extents.
>>
>> As you can see from the dmesg snippets, one of my ext4 file systems  
>> mounted perfectly.  The one that didn't is an lvm2 "array", which seems 
>> to be consistent.
> 
> E2fsck 1.41.3 does actually have extent support, but let's not be too
> hasty to run e2fsck just yet.
> 
> Can you send me the output of "dumpe2fs -o superblock=32768
> /dev/main_huge_vg/main_huge_lv" and see how it compares to the
> dumpe2fs of your primary superblock?

# dumpe2fs -f -o superblock=32768 /dev/main_huge_vg/main_huge_lv | 
head -n800 > main_huge_lv.dump.sb32768.txt
dumpe2fs 1.41.3 (12-Oct-2008)
ext2fs_read_bb_inode: Invalid argument

http://members.cox.net/ron.l.johnson/main_huge_lv.dump.sb32768.txt

> It looks like your block group descriptors were totally scribbled
> upon.

There system cleanly shut down.  (Or, at least, I didn't notice 
anything obviously wrong.)

>        How and why it happened, I'm not sure.  But before we do
> anything else, let's check out the backup descriptors and make sure
> they are sane.

-- 
Ron Johnson, Jr.
Jefferson LA  USA

The feeling of disgust at seeing a human female in a Relationship
with a chimp male is Homininphobia, and you should be ashamed of
yourself.
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