Michael Ströder wrote:
Further testing with Andrew's kvm image shows the hang only occurs when Cyrus SASL's libsasldb2.so plugin is present.
Probably you already checked whether there's a BDB library mix.
Yes, the version is the same, BDB 4.7. However it's possible that BDB 4.7 doesn't like being initialized multiple times, as occurs here. I haven't yet looked more deeply to see what the real cause is.