opendir/readdir on /dev/fd. opendir/readdir are not async-signal- safe and may not be safely called after forking in a multi-threaded program. Issue raised to my attention by deraadt@. Also update to bsd release 2 of 11.0.3-7 which contains BsdSocketOptions fix and other corrections that can be viewed here: https://github.com/battleblow/openjdk-jdk11u/releases Okay ian@