The issue appears from time to time. In console log of the freestyle job as you can see in the picture below - job is waiting for something (this time it has been waiting during 2+ days) and "wlrun killed" message exists.

But in the Jenkins slave machine (Windows 10) the wlrun.exe process is alive.

Jenkins slave runs via JNLP (java 8 jdk b201).

 After restarting agent (close the above window and run slave-agent.jnlp from cmd as Administrator) the job can pass and after a while the issue sporadically may appear.