linux-kernel - Re: 2.6.18-mm2: ext3 BUG?

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Date:	Sun, 8 Oct 2006 10:48:16 +0200
From:	Jan-Benedict Glaw <jbglaw@...-owl.de>
To:	Andrew Morton <akpm@...l.org>, Jiri Slaby <jirislaby@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	sct@...hat.com, adilger@...sterfs.com, linux-ext4@...r.kernel.org
Subject: Re: 2.6.18-mm2: ext3 BUG?

On Sun, 2006-10-08 08:33:30 +0200, Jan-Benedict Glaw <jbglaw@...-owl.de> wrote:
> dd bs=1M count=200 if=/dev/zero of=test0
> while :; do
> 	echo "cp 0-1"; cp test0 test1 || break
> 	echo "cp 1-2"; cp test1 test2 || break
> 	echo "cp 2-3"; cp test2 test3 || break
> 	echo "cp 3-4"; cp test3 test4 || break
> 	echo "od 0" ; od test0 || break
> 	echo "rm 1"; rm test1 || break
> 	echo "rm 2"; rm test2 || break
> 	echo "rm 3"; rm test3 || break
> 	echo "rm 4"; rm test4 || break
> done

Just tested again and got *exactly* the same error message, bit
already cleared for block 194810, but this time after only 20min:

> EXT3-fs error (device dm-5): ext3_free_blocks_sb: bit already cleared for block 194810
> Aborting journal on device dm-5.
> ext3_abort called.
> EXT3-fs error (device dm-5): ext3_journal_start_sb: Detected aborted journal
> Remounting filesystem read-only
> EXT3-fs error (device dm-5) in ext3_reserve_inode_write: Journal has aborted
> EXT3-fs error (device dm-5) in ext3_truncate: Journal has aborted
> EXT3-fs error (device dm-5) in ext3_reserve_inode_write: Journal has aborted
> EXT3-fs error (device dm-5) in ext3_orphan_del: Journal has aborted
> EXT3-fs error (device dm-5) in ext3_reserve_inode_write: Journal has aborted
> __journal_remove_journal_head: freeing b_committed_data
> __journal_remove_journal_head: freeing b_committed_data
> __journal_remove_journal_head: freeing b_committed_data
> 
> 
> Last echoes from the testcase above:
> 
> rm 1
> rm 2
> rm: cannot remove `test2': Read-only file system

...and with exactly the same position it broke again.

> kolbe34-backup:/mnt# dumpe2fs /dev/kolbe34_backup/ext3crash 2>/dev/null | grep features
> Filesystem features:      has_journal resize_inode dir_index filetype needs_recovery sparse_super large_file

However, fsck looks a bit different this time:

kolbe34-backup:/mnt# e2fsck -jy /dev/kolbe34_backup/ext3crash
e2fsck 1.39 (29-May-2006)
/dev/kolbe34_backup/ext3crash: recovering journal
/dev/kolbe34_backup/ext3crash contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Deleted inode 49154 has zero dtime.  Fix<y>?

/dev/kolbe34_backup/ext3crash: e2fsck canceled.

/dev/kolbe34_backup/ext3crash: ***** FILE SYSTEM WAS MODIFIED *****

/dev/kolbe34_backup/ext3crash: ********** WARNING: Filesystem still has errors **********

kolbe34-backup:/mnt# e2fsck -fy /dev/kolbe34_backup/ext3crash
e2fsck 1.39 (29-May-2006)
Pass 1: Checking inodes, blocks, and sizes
Deleted inode 49154 has zero dtime.  Fix? yes

Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences:  -(107533--124927) -(178242--194673)
Fix? yes

Free blocks count wrong for group #3 (7686, counted=25081).
Fix? yes

Free blocks count wrong for group #5 (1933, counted=18366).
Fix? yes

Free blocks count wrong (15196903, counted=15230731).
Fix? yes

Inode bitmap differences:  -49154
Fix? yes

Free inodes count wrong for group #3 (16379, counted=16380).
Fix? yes

Free inodes count wrong (7864304, counted=7864305).
Fix? yes

/dev/kolbe34_backup/ext3crash: ***** FILE SYSTEM WAS MODIFIED *****
/dev/kolbe34_backup/ext3crash: 15/7864320 files (6.7% non-contiguous), 497909/15728640 blocks

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw@...-owl.de              +49-172-7608481
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