I'm using mysql-proxy 0.8.3 on a Windows 7 system.
Sometimes, I get the following debug message in the log :
(debug) .\chassis-event-thread.c:254: recv() from event-notify-fd failed: Unknown error
and mysql-proxy process starts to use 25% of the CPU (on a quad-core) until I kill it. It continues to handle queries properly while it overloads the system.
The same queries/scripts doesn't always trigger the problem. I have very no idea of how to fix it.