"PostgreSQL Bugs List" <pgsql-bugs@postgresql.org> writes:
> Sometime's the system hangs in PQfinish !
Hmm, that's a new one; don't think anyone has reported anything like
that before.
The closest thing that comes to mind is that most of the 7.3.* series
had data-transfer problems when using SSL-encrypted connections,
because of various bugs in the SSL-calling code in libpq. Is this
connection using SSL? Is it possible that your program is linking to
the 7.3 rather than 7.4 version of libpq?
If that's not it then you'll need to provide more information. Could
you get a stack backtrace to show just where it's hanging up?
regards, tom lane