When upgrading from 3.0.9 to 3.0.11, one site that uses a PostgreSQL
database with regexp postprocessing of database contents for extended
HTML formatting, PHP segfaulted.  Another site with similar handling
showed the same effect, although less often and less critical (the DB
is smaller on that site, less regexp handling done).

Since the server is a production system and there was no development
system available at that moment, we had no chance to track this further
down.  However, it appeared to me that the cause for the crash was caused by the regexp postprocessing.