here are the patches we wrote.
this email contains a complete update pgcluster from 7.4.7 to 7.4.13. in 
addition we fixed amd64 compiler warnings, some nasty memory leak and 
some other minor issues.
there is just one bug left. something is wrong with socket 
communication. it can happen that a socket is closed and used 
afterwards. it seems that some pthread_join calls or not exactly where 
they should be but we don't know how to fix it precisely yet. 