Not on that much evidence; but trying to pass a libpq connection across a fork is usually risky. The trouble is that both parent and child processes now hold copies of the open socket connection, but only one of them can safely work with it. It could be that you've closed the libpq connection in one process and that killed its usability in the other.
Thanks Tom, that is pretty much the conclusion I came to. I think I need to close the db connection prior to the fork and then re-open in the new child.
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