pointing people who saw this to JENKINS-9634

core/src/main/java/hudson/util/ProcessTree.java

@@ -1062,7 +1062,7 @@ public abstract class ProcessTree implements Iterable<OSProcess>, IProcessTree,
                             arguments.add(m.readString());
                         }
                     } catch (IndexOutOfBoundsException e) {
-                        throw new IllegalStateException("Failed to parse arguments: arg0="+args0+", arguments="+arguments+", nargs="+argc,e);
+                        throw new IllegalStateException("Failed to parse arguments: pid="+pid+", arg0="+args0+", arguments="+arguments+", nargs="+argc+". Please run 'ps e "+pid+"' and report this to https://issues.jenkins-ci.org/browse/JENKINS-9634",e);
                     }
 
                     // read env vars that follow