fixed in Perl 5.19.4, but the fix was not sufficient and another fault has now
been corrected.
+=item *
+
+In some cases, closing file handled opened to pipe to or from a process, which
+had been duplicated into a standard handle, would call perl's internal waitpid
+wrapper with a pid of zero. With the fix for [perl #85228] this zero pid was
+passed to waitpid(), possibly blocking the process. This wait for process
+zero no longer occurs. [perl #119893]
+
=back
=head1 Known Problems