Ancient MySQL problem, still unsolved

For the longest time, I've had a strange problem with MySQL. Basically, after a certain amount of time--it could be a few days, or a couple weeks--its CPU usage will go from around 20% to 80%, with exactly the same load.
If I shutdown MySQL and restart it, CPU load is back to normal. What could this be?
...Rene

With some great help from the MySQL mailing list, I believe I've identified the problem, which is fundamental to Mac OS X's BSD UNIX layer: DNS lookups are not thread-safe in the version of BSD (5?) used by Mac OS X. The workaround is to add skip-name-resolve to my.cnf, and ensure that MySQL's GRANT tables use IPs instead of host names. Here's some resources on the topic, in case anyone else runs into this:
http://jeremy.zawodny.com/blog/archives/000203.html
http://bugs.mysql.com/bug.php?id=414
http://www.mail-archive.com/[email protected]/msg87497.html
http://lists.apple.com/archives/Opentransportdev/2001/Dec/msg00060.html
...Rene

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