last sucessful build was on Dec 1st - after that they fail:
Started by upstream project "vyos-build" build number 337
originally caused by:
Started by timer
[EnvInject] - Loading node environment variables.
Building remotely on jessie64devel.vyos.net (jessie-amd64 amd64) in workspace /home/jenkins/workspace/vyos-build/build/jessie64devel.vyos.net
Cloning the remote Git repository
Cloning repository https://github.com/vyos/vyos-build.git
ERROR: Failed to clean the workspace
java.io.IOException: Unable to delete '/home/jenkins/workspace/vyos-build/build/jessie64devel.vyos.net'. Tried 3 times (of a maximum of 3) waiting 0.1 sec between attempts.