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ditzydoo saw this in her logs:

2012-02-11 15:07:40 [info] EOF from 127.0.0.1:5001
2012-02-11 15:07:40 [info] EOF from 127.0.0.1:5001
2012-02-11 15:07:40 [info] EOF from 127.0.0.1:5001
2012-02-11 15:07:40 [info] EOF from 127.0.0.1:5001
2012-02-11 15:07:40 [info] EOF from 127.0.0.1:5001
2012-02-11 15:07:40 [info] EOF from 127.0.0.1:5001
2012-02-11 15:07:41 [info] [scrubbed]:51264 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:07:41 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:08:44 [info] [scrubbed]:14924 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:08:44 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:09:33 [info] [scrubbed]:12792 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:09:33 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:09:50 [warn] Error during flush of connection with 127.0.0.1:5001: Broken pipe
2012-02-11 15:10:06 [info] [scrubbed]:50247 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:10:06 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:10:51 [info] [scrubbed]:25002 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:10:51 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:10:59 [info] [scrubbed]:16450 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:10:59 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:11:47 [info] [scrubbed]:16490 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:11:47 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:13:02 [info] [scrubbed]:18014 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:13:02 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:13:22 [info] [scrubbed]:1236 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:13:22 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:13:24 [info] [scrubbed]:16605 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:13:24 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:18:12 [info] [scrubbed]:4046 (obfs2): trying to connect to 127.0.0.1:5001
2012-02-11 15:18:12 [warn] Error talking to 127.0.0.1:5001: Resource temporarily unavailable
2012-02-11 15:20:08 [info] Closing all listeners.
2012-02-11 15:20:08 [info] Got SIGINT. Preparing shutdown.
2012-02-11 15:20:08 [info] Exiting.

error_cb() says

  if (what & BEV_EVENT_ERROR) {
    log_warn("Error talking to %s: %s",
             conn->peername,
             evutil_socket_error_to_string(errcode));
[...]
  error_or_eof(conn);

and error_or_eof's comments say

/**
   Something broke one side of the connection, or we reached EOF.
   We prepare the connection to be closed ASAP.

grep for EAGAIN in the code shows nothing. Are we really hanging up as soon as we get an EAGAIN? Or does libevent magically take care of that for us somehow?