title: tomcat7 hangs up 100%cpu and restart tomcat be of no effect . until restart system
body: <p>my server runs on centos 6.5</p>
  
  <p>i can't unstand why restart the tomcat, the problem can't fix. until restart os is ok. please some can help me? below is my  envronment: thanks!</p>
  
  <p>running env is:</p>
  
  <p>Server version: Apache Tomcat/7.0.55</p>
  
  <p>Server built:   Jul 18 2014 05:34:04</p>
  
  <p>Server number:  7.0.55.0</p>
  
  <p>OS Name:        Linux</p>
  
  <p>OS Version:     2.6.32-431.el6.x86_64</p>
  
  <p>Architecture:   amd64</p>
  
  <p>JVM Version:    1.7.0_67-b01</p>
  
  <p>JVM Vendor:     Oracle Corporation</p>
  
  <pre><code>JAVA_OPTS="$JAVA_OPTS -Xmx12g -XX:NewRatio=4 -XX:SurvivorRatio=8 -XX:+UseCompressedOops -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+DisableExplicitGC -XX:+UseCMSInitiatingOccupancyOnly -XX:+CMSClassUnloadingEnabled -XX:+CMSScavengeBeforeRemark -XX:CMSInitiatingOccupancyFraction=68 -XX:+PrintHeapAtGC -XX:+PrintGCDetails  -Xloggc:$CATALINA_BASE/logs/tomcat_gc.log -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager"
  </code></pre>
  
  <p>jstack:  i dumped 4 thread stack using jstack on 4 diffrent time
  <a href="http://pan.baidu.com/s/1jGKMxDW#path=%252Fjstack" rel="nofollow">4 jstack file </a></p>