I'm going to attempt some source staring; if someone could confirm or
deny the following assertions (and add appropriate additional
information), that would help me.
1) The corruption always takes the form of a 4k aligned page of zeros
showing up.
2) The corruption does not happen to directories.
3) The corruption happens to both existing and new files.
4) The corruption happens only when files are being extended.
5) The corruption happens only in the middle of files.
6) If you have a corrupt filesystem, and shut it down sanely, and then
fsck it, fsck reports no errors. (In other words, the corruption
is not associated with block map errors or such.)
Thomas
