Sorry if this is a duplicate, I sent a similar report with perlbug yesterday but didn't receive it back nor can I find it in the archive. Maybe mail on that machine was misconfigured. It's a long standing bug, the following code core dumps with yesterday's repository perl. perl -le ' require "MD5.pm"; sub new { bless {}, shift;} # OK if commented open FH, "/etc/hosts" or die; my $md5 = new MD5; # OK if MD5->new print "md5[$md5]\n"; # prints e.g. md5[MD5=HASH(0x80ee280)] $md5->addfile(*FH); # SEGV ' md5[MD5=HASH(0x80ed200)] zsh: segmentation fault (core dumped) I have reported this long time ago (no bug ID), you can find the old postings with this query: http://www.xray.mpe.mpg.de/cgi-bin/w3glimpse/perl5-porters?query=md5+addfile+hash&errors=0&case=on&maxfiles=100&maxlines=30 -- andreasThread Next