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`xmpp_run_once()` uses `FD_SET()` to determine which sockets to `select()` on. The socket gets initialized to `INVALID_SOCKET = -1` inside `xmpp_conn_new()` which leads to a buffer overflow once `FD_SET()` is called. This is only exposed when enabling a higher optimization level, which was only done in the `release-test` CI job. * Fix this testcase by initializing the socket to a possible value. * Build the Valgrind CI jobs with `-O2`. * Make the output of the `release-test` more verbose. Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>