I've succeeded in reproducing your error, and the problem turns out to be associated with opendir/readdir/closedir. Regardless of whether the you use globals or lexicals; or whether the directory handle is closed prior to spawning the threads, you get a trap when trying to join the threads. That doesn't make much sense to me, but there we are.

I have a work around. Replace:

opendir (CDIR, $cfgFilesDir) or die;
my $file;
my $thr;
while ($file = readdir(CDIR)) {
    if ($file =~ /.+?\.properties/) {
        $thr = threads->create(\&sendRequest, $file, 'localhost', $pee
+rPort );
    }
}
closedir (CDIR);
[download]

with

while( my $file = <*.properties> ) { ## Check the glob matches your fi
+les!
    my $thr = threads->create(\&sendRequest, $file, 'localhost', $peer
+Port );
}
[download]

And the global destruction problem will probably go away. At least it does here.

There are other problems in your code that you'll discover if you enable strict.