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I'm running three tor 0.2.4.17-rc clients on ferrinii for Torperf, and one of them stopped building new circuits a while ago:

Sep 19 08:28:42.000 [notice] We'd like to launch a circuit to handle a connection, but we already have 33 general-purpose client circuits pending. Waiting until some finish. [1 similar message(s) suppressed in last 600 seconds]

The process is still running and I can debug it (though I should kill and restart it at some point to make Torperf work again). I sent it -USR1 and -USR2 signals to dump stats and switch to debug log level. I'm attaching the logs since last restarting it.

Here's the torrc:

DataDirectory .
SocksPort 9021
UseEntryGuards 0
RunAsDaemon 1
Log notice file log
ControlPort 10021
CookieAuthentication 1
PidFile tor.pid

Roger suspects it has to do with 0.2.4.x using guards as directory guards and this tor not using guards.