Patch to set perl_destruct_level to -1 no longer appears required. Tested with
perl 5.8.2 on i386. Typical problems used to include failed restarts via SIGHUP
which have now gone away.
This may only cover up a symptom of an underlying problem with perl
5.6.1 so currently mod_perl should be used with caution until we
find the real bug - probably in the perl sources
found by Pavel Kovorin <pvk@tsinet.ru>