linux-kernel - Re: [BUG] Kernel Bug at fs/btrfs/volumes.c:3638

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Message-ID: <4F4B1B0C.4040100@linux.vnet.ibm.com>
Date:	Mon, 27 Feb 2012 11:26:28 +0530
From:	Nageswara R Sastry <rnsastry@...ux.vnet.ibm.com>
To:	Liu Bo <liubo2009@...fujitsu.com>
CC:	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	chris.mason@...cle.com, kamalesh@...ux.vnet.ibm.com
Subject: Re: [BUG] Kernel Bug at fs/btrfs/volumes.c:3638

On ఫిబ్రవరి 25 శనివారం 2012 ఉ. 11:42, Liu Bo wrote:
> Hi, I guess you're mounting a quite small partition. Given that this 
> oops is in such an early stage, could you please show 1) your 
> mkfs.btrfs options and 2) the log of "btrfs-debug-tree /dev/loop0"? 
> thanks, liubo
Here are the steps with options,

1. dd if=/dev/zero of=<filename.img> bs=1M count=16

2. mkfs.btrfs <filename.img>

3. Corrupt the <filename.img> using 'mangle'

4. mount -t btrfs -o loop <filename.img> <mount point>

5. # btrfs-debug-tree <filename.img>
Couldn't map the block 3221392384
Couldn't read chunk root
unable to open <filename.img>
# btrfs-debug-tree /dev/loop0
Couldn't map the block 3221392384
Couldn't read chunk root
unable to open /dev/loop0

Regards,
R.Nageswara Sastry

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