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From Sachin Nikam <skni...@gmail.com>
Subject Possible deadlock in cxf
Date Wed, 26 Feb 2014 19:15:21 GMT
I have thread dump from the jvm and looks like there is a deadlock. Almost
all the threads are BLOCKED in WSDLGetInterceptor.handleMessage() while
waiting on a lock for an Object whose internal id=0x00000000b0fab6d.  There
is another thread which has acquired this Object's lock but is waiting  for
a lock on Object id=0x00000000ae68d7c0. This Object id does not appear
anywhere else in the thread dump. I will probably need a Heap Dump to
figure out which object is being referred.

Holding a lock on an object and trying to acquire another lock is an
anti-pattern known to cause deadlock issues.

Has anybody else run in to this issue before and identified the root cause
and resolution?

Could this be related to the fact that my current logback configuration did
not set a MaxHistory value with the result that the number of log files
kept on increasing without any trimming? I am going to fix that issue but I
am not sure it will fix the deadlock issue.

Any clues or ideas would be helpful.



*******Example stack trace of threads Blocked***************

INFO   | jvm 1    | 2014/02/25 19:41:45 | "qtp87423451-4981" prio=10
tid=0x00007fed3c331800 nid=0x6766 waiting for monitor entry
[0x00007fece43c2000]

INFO   | jvm 1    | 2014/02/25 19:41:45 |    java.lang.Thread.State:
BLOCKED (on object monitor)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.frontend.WSDLGetInterceptor.handleMessage(WSDLGetInterceptor.java:100)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 - waiting to lock
<0x00000000b0fab6d0> (a org.apache.cxf.jaxws.support.JaxWsEndpointImpl)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:271)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 - locked
<0x00000000a71042c0> (a





************Stack Trace of Thread causing the deadlock***********



INFO   | jvm 1    | 2014/02/25 19:41:45 |    java.lang.Thread.State:
WAITING (parking)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
sun.misc.Unsafe.park(Native Method)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 - parking to wait
for  <0x00000000ae68d7c0> (a java.util.concurrent.Semaphore$NonfairSync)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
java.util.concurrent.Semaphore.acquire(Semaphore.java:317)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.eclipse.jetty.util.BlockingCallback.block(BlockingCalbback.java:96)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.eclipse.jetty.server.HttpChannel.write(HttpChannel.java:662)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:198)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.io.AbstractWrappedOutputStream.write(AbstractWrappedOutputStream.java:51)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
com.ctc.wstx.io.UTF8Writer.write(UTF8Writer.java:143)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
com.ctc.wstx.sw.BufferingXmlWriter.flushBuffer(BufferingXmlWriter.java:1366)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
com.ctc.wstx.sw.BufferingXmlWriter.writeAttrValue(BufferingXmlWriter.java:1055)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
com.ctc.wstx.sw.BufferingXmlWriter.writeAttribute(BufferingXmlWriter.java:883)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
com.ctc.wstx.sw.BaseNsStreamWriter.doWriteAttr(BaseNsStreamWriter.java:516)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
com.ctc.wstx.sw.BaseNsStreamWriter.writeAttribute(BaseNsStreamWriter.java:228)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:915)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:838)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeNode(StaxUtils.java:975)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:940)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:838)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeNode(StaxUtils.java:975)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:940)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:838)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeNode(StaxUtils.java:975)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:940)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:838)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeNode(StaxUtils.java:975)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:940)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:838)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeNode(StaxUtils.java:975)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:940)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeElement(StaxUtils.java:838)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeNode(StaxUtils.java:975)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeDocument(StaxUtils.java:816)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeDocument(StaxUtils.java:804)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.staxutils.StaxUtils.writeNode(StaxUtils.java:994)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 at
org.apache.cxf.frontend.WSDLGetInterceptor.handleMessage(WSDLGetInterceptor.java:129)

INFO   | jvm 1    | 2014/02/25 19:41:45 |                 - locked <
0x00000000b0fab6d0> (a org.apache.cxf.jaxws.support.JaxWsEndpointImpl)

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