Hello.

Last night, my laptop suddenly started yelling "Filesystem full on /usr",
out of nowhere. I had been doing a massive rebuild, so my first assumption
was that something had gone beserk, as I usually have around 12GB free.

However, I was unable to find the culprit. 'df' claimed that the disk was
105% full, all emergency blocks used, but 'du' could only account for about
4G (It's a 16GB filesystem). So I rebooted to single-user mode, did an
fsck -f, which didn't find anything, and presto: /usr is at 23% capacity 
once again. 

Any idea what might've gone wrong?

-- 
    Martijn van Buul - pino@dohd.org - http://www.stack.nl/~martijnb/
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 The most exciting phrase to hear in science, the one that heralds new
discoveries, is not 'Eureka!' (I found it!) but 'That's funny ...' Isaac Asimov