Linux找死锁、cpu100%

mysql2:~ #top

Shift+p 按照cpu排序

 找到cpu最高进程pid 28324

mysql2:~ #top -H -p 28324

 找到cpu最高的线程tid 31218

mysql2:~ #printf "%x " 31218
79f2

转换线程为16进制

mysql2:~ #jstack 28324 | grep -A 10 "79f2"
"ContainerBackgroundProcessor[StandardEngine[Catalina]]" #49 daemon prio=5 os_prio=0 tid=0x00007fa27c1c1800 nid=0x79f2 waiting on condition [0x00007fa2609d2000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
        at java.lang.Thread.sleep(Native Method)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1359)
        at java.lang.Thread.run(Thread.java:748)

"WebSocketTimer" #47 daemon prio=5 os_prio=0 tid=0x00007fa21c007000 nid=0x79c2 in Object.wait() [0x00007fa2591ff000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        at java.util.TimerThread.mainLoop(Timer.java:552)
        - locked <0x00000000a5f913c8> (a java.util.TaskQueue)

在dump中，线程一般存在如下几种状态：
　　1、RUNNABLE，线程处于执行中
　　2、BLOCKED，线程被阻塞
　　3、WAITING，线程正在等待