Looks like you got a block of zeros from disk when it should have been a
block bitmap, or your filesystem is otherwise corrupted. You need to do
a full fsck on this filesystem.
As for cause, I have no idea. IDE DMA, IDE cables, memory, kernel bug...
-- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/
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