From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stone <stone@heisl.org>
Subject: fsck illegal bitmap block
Date: Mon, 06 May 2013 19:40:22 +0200
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hi.

i have a broken filesystem that i have checked with fsck.

here is my error output:
Inode 22161733 has an invalid extent node (blk 88789488, lblk 0)
Clear? yes
fsck.ext4: e2fsck_read_bitmaps: illegal bitmap block(s) for 
/dev/mapper/md2_nas
/dev/mapper/md2_nas: ***** FILE SYSTEM WAS MODIFIED *****
e2fsck: aborted
/dev/mapper/md2_nas: ***** FILE SYSTEM WAS MODIFIED *****
echo $?
9

the check cancel always at 88789488.
my os is a ubuntu 12.04 64bit system with the e2fsprogs verions 
1.42.5-1ubuntu4

i hope some guys have an idea ;-)

thx.