help! bad filesystem summary trashes system

[Michael Nottebrock]

Somehow my /usr filesystem ended up being corrupted in such a way that it's 
now recognized as 11 terabytes big and with -11tb free... fsck fails with 
"Cannot alloc 1683933532 bytes for inphead" and when I mount the corrupted fs 
as it is, running pretty much any program completely freezes the system 
(5.3-RELEASE-p1).

What can I do now to make fsck work? I'm amazed something like this can happen 
at all. :-(

-- 
   ,_,   | Michael Nottebrock               | lofi at freebsd.org
 (/^ ^\) | FreeBSD - The Power to Serve     | http://www.freebsd.org
   \u/   | K Desktop Environment on FreeBSD | http://freebsd.kde.org
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