Your code (slightly modified for win32), doesn't appear to leak under AS811/5.8.6 or AS817/5.8.8.

#!/usr/bin/perl
use strict;
use warnings;
use threads;
use Thread::Queue;
my $queue = Thread::Queue -> new;

threads -> create ("popper", $queue) -> detach for (1..10);

my $message="this is a line of test around the right size";

while (1) {
    $queue -> enqueue ($message) for (1..100);
    sleep 1 while $queue -> pending;
    system qq[tasklist /nh /fi "PID eq $$"];
}

sub popper {
    print "started a popper\n";
    my $queue = shift;
    while ($queue -> dequeue) {
        print ".";
    }
}
__END__
C:\test>junk5
started a popper
started a popper
started a popper
started a popper
started a popper
started a popper
started a popper
started a popper
started a popper
started a popper
perl.exe                    3128                         0      6,936 
+K
perl.exe                    3128                         0      6,944 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
perl.exe                    3128                         0      6,948 
+K
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