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From Jim Cox <shakahsha...@gmail.com>
Subject Re: EXTERNAL: Re: Tomcat hung
Date Fri, 19 Nov 2010 13:19:44 GMT
In your full production trace, is there an indication which thread has
the "<0xd50244e8>" lock?

I've debugged similar situations where threads were "blocked waiting
for monitor <0x.....>" (getting java.sql.Connections, as it turned
out) -- identifying & examining the thread that had locked that
monitor (with a message something like "grabbed monitor <0x....>")
helped quite a bit w/debugging.


On Thu, Nov 18, 2010 at 10:35 AM, Robillard, Greg L
<greg.l.robillard@lmco.com> wrote:
> Production, as of yet, strangely, I have not been able to create this problem testing.
>
> Here is the top of the stack without a profiler.
>
> 2010-10-04 10:35:50
> Full thread dump Java HotSpot(TM) Server VM (10.0-b19 mixed mode):
>
> "Attach Listener" daemon prio=10 tid=0x08170400 nid=0x716b waiting on condition [0x00000000..0x00000000]
>   java.lang.Thread.State: RUNNABLE
>
> "http-8080-200" daemon prio=10 tid=0xcbca9800 nid=0xb5e waiting on condition [0xc5dbc000..0xc5dbcea0]
>   java.lang.Thread.State: WAITING (parking)
>        at sun.misc.Unsafe.park(Native Method)
>        - parking to wait for  <0xd50244e8> (a java.util.concurrent.locks.ReentrantReadWriteLock$FairSync)
>        at java.util.concurrent.locks.LockSupport.park(Unknown Source)
>        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(Unknown
Source)
>        at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(Unknown
Source)
>        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(Unknown
Source)
>        at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(Unknown
Source)
>        at com.lmco.fltwinds.wxserver.wcs.ScanningCoverage.getOffering(ScanningCoverage.java:286)
>        at com.lmco.fltwinds.wxserver.wcs.ScanningCoverage.getCoverageOffering(ScanningCoverage.java:282)
>        at com.luciad.ogc.wcs.server.f.a(SourceFile:124)
>        at com.luciad.ogc.wcs.server.f.a(SourceFile:14)
>        at com.luciad.ogc.wcs.server.f$c.handleRequest(SourceFile:155)
>        at com.luciad.ogc.common.f.a(LuciadMap:41)
>        at com.luciad.ogc.wcs.TLcdWCSServlet.a(LuciadMap:68)
>        at com.luciad.ogc.wcs.TLcdWCSServlet.doGet(LuciadMap:99)
>        at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
>        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
>        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
>        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
>        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
>        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
>        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
>        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
>        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
>        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
>        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
>        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
>        at java.lang.Thread.run(Unknown Source)
>
> "http-8080-199" daemon prio=10 tid=0xcbca8400 nid=0xb5d waiting on condition [0xc5e0d000..0xc5e0de20]
>   java.lang.Thread.State: WAITING (parking)
>        at sun.misc.Unsafe.park(Native Method)
>        - parking to wait for  <0xd50244e8> (a java.util.concurrent.locks.ReentrantReadWriteLock$FairSync)
>        at java.util.concurrent.locks.LockSupport.park(Unknown Source)
>
> I can include more if required.

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