The physical memory was mostly used up, with 100MB free, 600MB cached,
and 1300MB used. Swap was completely virgin: not a single byte had been
used. The load was very normal: a lot of perl scripts reading and
writing over the network to a database. No oddball mlock activity or
any other out-of-the-ordinary workload.
I left the machine overnight to see if it would sort itself out, but it
did not. I had to power cycle it. I upgraded (?) to 2.4.14 + ext3
0.9.15, and will report if the same happens again.
-jwb
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