Here's a patch to fix this issue.
--- debpool_released/share/DebPool/Gzip.pm 2007-12-03 14:10:49.000000000 -0500 +++ debpool/share/DebPool/Gzip.pm 2007-12-09 01:53:40.000000000 -0500 @@ -133,6 +133,7 @@ close(SOURCE); waitpid($child_pid, 0); + waitpid($gzip_pid, 0); } else { # In the child - we hope if (!defined($child_pid)) { die "Couldn't fork: $!\n";