My Jenkins server seems seized... one of the jobs is stuck with a dozen or so job run requests which are listed as queued. One which is listed as running is stuck. I cannot kill it. The system log has this in it:
Aug 07, 2017 12:02:02 AM WARNING org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService reportProblem
Unexpected exception in CPS VM thread: CpsFlowExecutionOwner[doorstep-django-nodeploy/10241:doorstep-django-nodeploy #10241] java.lang.NullPointerException at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.getFirstHead(CpsFlowExecution.java:1189) at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.onProgramEnd(CpsFlowExecution.java:1031) at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:350) at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$100(CpsThreadGroup.java:82) at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:242) at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:230) at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:64) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:112) at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:748)