When the remote directory contains a FIFO file and the -Z option is used to return the remote files, then the dist-fork command hangs forever (after executing the command executed by dist-fork). 

To reproduce:

java -jar jenkins-cli.jar -s ... -auth ... dist-fork -l ...-n mkfifo -Z =zip sh -c 'mkfifo foo; echo Hello > foo; ls -al'

Also with -Z =tgz.