re: https://issues.jenkins-ci.org/browse/JENKINS-5413?focusedCommentId=219256&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-219256

fix_jenkins.groovy

import java.lang.management.*;

def threadBean = ManagementFactory.getThreadMXBean();
def osBean     = ManagementFactory.getOperatingSystemMXBean();

println "\n\n\n[Checking state of (master)]";

println "Current CPU Time used by Jenkins: " + threadBean.getCurrentThreadCpuTime() + "ns";

double processLoad = (osBean.getProcessCpuLoad() * 100).round(2);
double cpuLoad = (osBean.getSystemCpuLoad() * 100).round(2);
println "Process CPU Load: " + processLoad + "%";
println "CPU Load: " + cpuLoad + "%";

if (processLoad < 90) {
  println "\n\n\n === Load is less than 90%, nothing to do ===\n\n\n";
  println "\n\n\n[Done checking: CPU Load: " + cpuLoad + "%]\n\n\n";
  return;
} else {
  println "\n\n\n === Load is more than 90%, checking for stuck threads! ===\n\n\n";
}

println "\n\n\n[Checking all threads]\n\n\n";
def threadNum = 0;
def killThreadNum = 0;

def stacktraces = Thread.getAllStackTraces();
stacktraces.each { thread, stack ->
  if (thread.getName().contains("trigger/TimerTrigger/check") ) {
    println "=== Interrupting thread " + thread.getName()+ " ===";
    thread.interrupt();
    killThreadNum++;
  }
  threadNum++;
}

println "\n\n\n[Done checking: " + threadNum + " threads, killed " + killThreadNum + "]\n\n\n";

return; // Suppress groovy state dump