linux-ext4 - Re: Punch hole problem on PAGE

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Date:	Sun, 12 Feb 2012 02:32:57 -0700
From:	Allison Henderson <achender@...ux.vnet.ibm.com>
To:	Lukas Czerner <lczerner@...hat.com>
CC:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: Punch hole problem on PAGE_SIZE > blocksize

On 02/10/2012 12:10 PM, Lukas Czerner wrote:
> Hi Allison,
>
> I found quite disturbing problem when testing loop discard support on
> file systems where PAGE_SIZE>  blocksize. The result is that the file
> system image is completely destroyed, but the underlying file system
> seems ok. I have seen this messages in the logs:
>
> EXT4-fs error (device sdb): ext4_ext_search_left:1221: inode #12: comm
> flush-8:16: ix (2248761) != EXT_FIRST_INDEX (0) (depth 1)!
> EXT4-fs (sdb): delayed block allocation failed for inode 12 at logical
> offset 2258177 with max blocks 64 with error -5
> EXT4-fs (sdb): This should not happen!! Data will be lost
>
> and
>
> EXT4-fs error (device sdd2): ext4_ext_get_blocks: inode #12: (comm
> loop0) bad extent address iblock: 34479, depth: 3 pblock 0
>
> Steps to reproduce
>
> mkfs.ext4 -b1024 /dev/sdb
> mount /dev/sdb /mnt/test2
> dd if=/dev/zero of=/mnt/test2/file bs=1M count=4096
> losetup /dev/loop0 /mnt/test2/file
>
> cd xfstests
>
> export TEST_DIR=/mnt/test
> export TEST_DEV=/dev/sda
> export SCRATCH_DEV=/dev/loop0
> export SCRATCH_MNT=/mnt/test1
> export MKFS_OPTIONS="-F -b1024"
> export MOUNT_OPTIONS="-o discard"
> export FSTYP="ext4"
>
> while ./check 251; do echo "OK"; done
>
> ..and just wait and watch the logs.
>
> Do you have any idea what might be the problem ?
>
> Thanks!
> -Lukas
>

Hi Lukas,

Im having some trouble getting the bug to reproduce for me.  I have the 
dm-crypt module, but when I get to the test loop, i get "mount: unknown 
filesystem type 'crypto_LUKS'". Is there something else I need to do or 
install? With out being able to dig into it, I cant think of why it 
would do that, I have not seen it produce that error before.  :(   Thx!

Allison Henderson

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