nagios the turd.
After upgrading to FreeBSD 6.3 (from 6.2), my nagios setup kept going to 100% cpu over and over. There has been recent discussion and even patches posted on the FreeBSD list but those didn't help so much.
However, this did:
21:18 PST | jfesler@goat:~/ % cat /etc/libmap.conf
[/usr/local/nagios/bin/nagios]
libpthread.so.2 libthr.so.2
libpthread.so libthr.so
[bin/nagios]
libpthread.so.2 libthr.so.2
libpthread.so libthr.so
Restart nagios, then use lsof to verify that it linked to libthr instead of libpthread. (OR .. just check your CPU)
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