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From Christopher Schultz <ch...@christopherschultz.net>
Subject 100% CPU Usage when stopping Tomcat after OOM condition
Date Tue, 03 May 2011 14:22:27 GMT
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All,

Moments ago in our development environment, our webapp suffered an OOME
after many re-reployments (we know we have an undeploy-related leak).
When attempting to bounce Tomcat, the shutdown failed and I took a
thread dump which included the one non-trivial thread shown below.

I haven't looked at the code yet to see if there is some kind of loop
around this code, but top reported 100% CPU usage from this process so I
suspect something like that was happening.

We are using TC 6.0.32 on Debian Lenny and Sun/Oracle 32-bit
1.6.0_22-b04 Server VM.

This is less of a "help" request as it is an observation of an
unfortunate situation: the OOME is clearly the real problem and has
nothing to do with Tomcat itself. Unfortunately, after the OOME, Tomcat
was unable to shut down gracefully and that could be a problem in and of
itself.

Thanks,
- -chris

Stack trace hung during shutdown:

"main" prio=10 tid=0x08059400 nid=0x7da1 runnable [0xb7276000]
   java.lang.Thread.State: RUNNABLE
        at java.lang.Class.getDeclaredFields0(Native Method)
        at java.lang.Class.privateGetDeclaredFields(Class.java:2291)
        at java.lang.Class.getDeclaredFields(Class.java:1743)
        at
org.apache.catalina.loader.WebappClassLoader.clearReferencesStaticFinal(WebappClassLoader.java:2034)
        at
org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClassLoader.java:1929)
        at
org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java:1833)
        at
org.apache.catalina.loader.WebappLoader.stop(WebappLoader.java:740)
        at
org.apache.catalina.core.StandardContext.stop(StandardContext.java:4913)
        - locked <0xb01a3e68> (a org.apache.catalina.core.StandardContext)
        at
org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:932)
        at
org.apache.catalina.startup.HostConfig.undeployApps(HostConfig.java:1357)
        at org.apache.catalina.startup.HostConfig.stop(HostConfig.java:1328)
        at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:326)
        at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
        at
org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1094)
        - locked <0xb01a3cf0> (a org.apache.catalina.core.StandardHost)
        at
org.apache.catalina.core.ContainerBase.stop(ContainerBase.java:1106)
        - locked <0xb0220538> (a org.apache.catalina.core.StandardEngine)
        at
org.apache.catalina.core.StandardEngine.stop(StandardEngine.java:468)
        at
org.apache.catalina.core.StandardService.stop(StandardService.java:604)
        - locked <0xb0220538> (a org.apache.catalina.core.StandardEngine)
        at
org.apache.catalina.core.StandardServer.stop(StandardServer.java:788)
        at org.apache.catalina.startup.Catalina.stop(Catalina.java:662)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:629)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
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