We have been experiencing crashes on Jenkins master. They happens every 2-3 days.
They look to happen in relation to a job which runs hourly and uses the CopyArtifact step.
The job runs hourly on one of the nodes. It calls the copyArtifact to grab the latest successful build from the main release build.
selector: [$class: 'LastCompletedBuildSelector'],
The crash happens only occasionally (every 2-3 days). The crash is on the jenkins master server.