*UPDATE*: Fixed in 1.1.5, still reproducible in 1.2.0. Uncomment the "/TLS/handshake_stall" test and fix in 1.2.0-dev branch.

The default stream initiator in mongoc_client.c makes a blocking call to mongoc_stream_tls_do_handshake(). This can cause the driver to full hang until some kind of network error is returned.

https://github.com/mongodb/mongo-c-driver/blob/master/src/mongoc/mongoc-client.c#L339

We should pull connecttimeoutms or sockettimeoutms out of the uri and use that in lieu of permanent blocking.