Very strange autofs failure on 2.6.30-rc2 with autofs-5.0.3-41 (fc10)

["H. Peter Anvin" <hpa@zytor.com>]

I have been using for a very long time a setup where /home is an autofs 
from a plain indirect NIS map, but my personal home directory 
(/home/hpa) is simply a bind mount from /export/home/hpa.  A 
straightforward use of autofs.

I just rebooted my system yesterday, however, and found that all the 
directory entries in my home directory had gotten replaced with ghost 
directories -- and even more confusingly, the date wasn't the current 
date, but was back in 2008.

The ghost directories were "sterile" in the sense that entering them 
wouldn't show the proper contents of those directories.  As a result, 
massive failure.

After suspecting filesystem corruption, and this, that and the other 
thing, I found that this was only when viewing though autofs 
(/home/hpa), and that the real filesystem (/export/home/hpa) was fully 
intact.  Somehow autofs had ended up ghosting pretty much my entire 
directory, and doing so in some incorrect fashion.

Replacing /home with a plain bind mount (no autofs) to /export/home 
resolved the issue.

	-hpa