While testing OCSP behavior in the PHP driver (1.15-dev branch using libmongoc 1.23-dev) against Atlas Serverless, I noted that the libmongoc trace logs had about 15MB worth of redundant socket_poll() logs constantly emitted every 3-4 microseconds over the span of about two seconds.

[2022-10-24T04:00:20.721645+00:00]     stream: TRACE   > ENTRY: _mongoc_stream_socket_poll():228
[2022-10-24T04:00:20.721664+00:00]     socket: TRACE   > ENTRY: mongoc_socket_poll():297
[2022-10-24T04:00:20.721683+00:00]     stream: TRACE   >  EXIT: _mongoc_stream_socket_poll():254

While there is an entry/exit for mongoc_stream_tls_openssl_new shortly before the spam starts, the majority of TLS tracing (including all references to OCSP) appears after the large block of socket_poll traces. I've attached the full trace log to this ticket.

The PHP script itself was quite simple (connect and ping):

<?php
 
ini_set('mongodb.debug', 'stderr');

$manager = new MongoDB\Driver\Manager('mongodb+srv://...')
$manager->executeCommand('admin', new MongoDB\Driver\Command(['ping' => 1]));