Out of memory errors with mod_perl

If we try to run a perl script which accesses a Postgres dB using mod_perl
with Apache we get:
"child pid 25144 exit signal Segmentation fault (11)
Out of memory!"

The scripts work fine when used w/o mod_perl, and other non-Postgres
scripts wotk OK with mod_perl.

What are we doing wrong?

Thanks

Steve
                      
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