IPC::Open3 in order to work in as many platforms as possible has become so complex that its inners are almost inaccessible...

Anyway, you have several options:

• Use truss to see where (and why) the script is blocking at the OS level.
• Make your own version of open3. For Unix it should be quite simple (see below).
• ... or use some other CPAN module providing the same functionality (IPC::Run, IPC::Cmd, etc.).

# untested

use POSIX ();
sub my_open3 {
  pipe my($in_c), my($in_p) and
  pipe my($out_p), my($out_c) and
  pipe my($err_p), my($err_c) or croak "unable to create pipes";
  my $pid = fork;
  if (!$pid) {
    defined $pid or croak "fork failed";
    unless (open STDIN, '<&', $in_c and
            open STDOUT, '>&, $out_c and
            open STDERR, '>&, $err_c) {
      warn "redirections failed";
      POSIX::_exit(1);
    do { exec @_ };
    POSIX::_exit(1);
  }
  close $in_c;
  close $out_c;
  close $err_c;
  return ($in_p, $out_p, $err_p, $pid);
}
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