In the list of "things to try", I wonder why no one has mentioned SIGCHLD? It is possible that the DBI code is changing the signal mask to ignore that signal (no idea why it might do that). After the connect, try:
$SIG{CHLD}='DEFAULT';
I don't have Oracle to try myself.

In reply to Re: The bug in DBI package by cdarke
in thread The bug in DBI package by elf_firein

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