linux-ext4 - [Bug 12821] filesystem corrupts on heavy I/O

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Message-Id: <20090306202120.BF7D1108041@picon.linux-foundation.org>
Date:	Fri,  6 Mar 2009 12:21:20 -0800 (PST)
From:	bugme-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 12821] filesystem corrupts on heavy I/O

http://bugzilla.kernel.org/show_bug.cgi?id=12821





------- Comment #11 from sandeen@...hat.com  2009-03-06 12:21 -------
Ok, at least w/ e2fsprogs-1.41.4 the fs doesn't look too bad:

# e2fsck -fn sdb1.e2i 
e2fsck 1.41.4 (27-Jan-2009)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Free blocks count wrong (102518871, counted=100960243).
Fix? no

Free inodes count wrong (90170045, counted=90170006).
Fix? no


LargeData: ********** WARNING: Filesystem still has errors **********

LargeData: 7491/90177536 files (39.4% non-contiguous), 258164220/360683091
blocks

the inode in question:

debuge4fs:  ncheck 2621457
Inode   Pathname
2621457 /mysql/0004_rldb/fw1log20090302.MYI

is pretty fragmented:

# filefrag mysql/0004_rldb/fw1log20090302.MYI
File is stored in extents format
mysql/0004_rldb/fw1log20090302.MYI: 5820 extents found

There is a really large number of indirect (i.e. extent index) blocks in that
file:

# debugfs -c sdb1.e2i -R "stat <2621457>" | sed -e "s/, /\n/g" | grep IND | wc
-l
debugfs 1.41.4 (27-Jan-2009)
sdb1.e2i: catastrophic mode - not reading inode or group bitmaps
2730

I would still try my patch.

-Eric


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