Running hudson in a vmWare virtualized environment we tend to get some hangs
when hudson is performing builds. Here are the requested stack dumps:

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Hudson ENABLE AUTO REFRESH
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Build Executor Status

1. Status
   1
   Building skolvcm #241

terminate this build
2 Idle

Thread Dump
ant clean-all test: stdout copier

"ant clean-all test: stdout copier" Id=72 RUNNABLE (in native)
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:199)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
at java.io.BufferedInputStream.read(BufferedInputStream.java:317)

• locked java.io.BufferedInputStream@14c02d4
  at java.io.FilterInputStream.read(FilterInputStream.java:90)
  at hudson.util.StreamCopyThread.run(StreamCopyThread.java:56)

process reaper

"process reaper" Id=71 RUNNABLE (in native)
at java.lang.UNIXProcess.waitForProcessExit(Native Method)
at java.lang.UNIXProcess.access$900(UNIXProcess.java:20)
at java.lang.UNIXProcess$1$1.run(UNIXProcess.java:132)

RequestHandlerThread3

"RequestHandlerThread3" Id=11 WAITING on winstone.RequestHandlerThread@14db52b
at java.lang.Object.wait(Native Method)

• waiting on winstone.RequestHandlerThread@14db52b
  at java.lang.Object.wait(Object.java:485)
  at winstone.RequestHandlerThread.run(RequestHandlerThread.java:216)
  at java.lang.Thread.run(Thread.java:619)

RequestHandlerThread4

"RequestHandlerThread4" Id=12 RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:359)
at hudson.Functions.getThreadInfos(Functions.java:746)
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.commons.jexl.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:258)
at org.apache.commons.jexl.parser.ASTMethod.execute(ASTMethod.java:104)
at org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:83)
at org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:57)
at
org.apache.commons.jexl.parser.ASTReferenceExpression.value(ASTReferenceExpression.java:51)
at org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:80)
at hudson.ExpressionFactory2$JexlExpression.evaluate(ExpressionFactory2.java:71)
at
org.apache.commons.jelly.expression.ExpressionSupport.evaluateRecurse(ExpressionSupport.java:61)
at
org.apache.commons.jelly.expression.ExpressionSupport.evaluateAsIterator(ExpressionSupport.java:94)
at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:89)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.WhenTag.doTag(WhenTag.java:46)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.ChooseTag.doTag(ChooseTag.java:38)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at
org.kohsuke.stapler.jelly.CustomTagLibrary$StaplerDynamicTag$1.run(CustomTagLibrary.java:147)
at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.IfTag.doTag(IfTag.java:42)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:81)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at
org.kohsuke.stapler.jelly.CustomTagLibrary$StaplerDynamicTag$1.run(CustomTagLibrary.java:147)
at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)
at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:81)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)
at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)
at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)
at
org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:29)
at org.kohsuke.stapler.jelly.JellyFacet$1.dispatch(JellyFacet.java:56)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:485)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:403)
at org.kohsuke.stapler.Stapler.service(Stapler.java:116)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
at winstone.ServletConfiguration.execute(ServletConfiguration.java:249)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:335)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:378)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:49)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:155)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)
at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:244)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)
at java.lang.Thread.run(Thread.java:619)

Executor #1 for master

"Executor #1 for master" Id=28 WAITING on hudson.util.OneShotEvent@b124fa
at java.lang.Object.wait(Native Method)

• waiting on hudson.util.OneShotEvent@b124fa
  at java.lang.Object.wait(Object.java:485)
  at hudson.util.OneShotEvent.block(OneShotEvent.java:60)
  at hudson.model.Queue.pop(Queue.java:725)
  at hudson.model.Executor.grabJob(Executor.java:160)
  at hudson.model.Executor.run(Executor.java:102)

Executor #0 for master : executing skolvcm #241

"Executor #0 for master : executing skolvcm #241" Id=27 WAITING on
java.lang.UNIXProcess@1f2a9da
at java.lang.Object.wait(Native Method)

• waiting on java.lang.UNIXProcess@1f2a9da
  at java.lang.Object.wait(Object.java:485)
  at java.lang.UNIXProcess.waitFor(UNIXProcess.java:165)
  at hudson.Proc$LocalProc.join(Proc.java:166)
  at hudson.Launcher$ProcStarter.join(Launcher.java:275)
  at hudson.tasks.Ant.perform(Ant.java:206)
  at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
  at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:480)
  at hudson.model.Build$RunnerImpl.build(Build.java:158)
  at hudson.model.Build$RunnerImpl.doRun(Build.java:98)
  at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:354)
  at hudson.model.Run.run(Run.java:1106)
  at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
  at hudson.model.ResourceController.execute(ResourceController.java:93)
  at hudson.model.Executor.run(Executor.java:122)

Hudson UDP 33848 monitoring thread

"Hudson UDP 33848 monitoring thread" Id=26 RUNNABLE (in native)
at sun.nio.ch.DatagramChannelImpl.receive0(Native Method)
at
sun.nio.ch.DatagramChannelImpl.receiveIntoNativeBuffer(DatagramChannelImpl.java:202)
at sun.nio.ch.DatagramChannelImpl.receive(DatagramChannelImpl.java:188)
at sun.nio.ch.DatagramChannelImpl.receive(DatagramChannelImpl.java:132)

• locked java.lang.Object@1368c5d
  at hudson.UDPBroadcastThread.run(UDPBroadcastThread.java:63)

TCP slave agent listener port=0

"TCP slave agent listener port=0" Id=25 RUNNABLE (in native)
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)

• locked java.net.SocksSocketImpl@3945e2
  at java.net.ServerSocket.implAccept(ServerSocket.java:453)
  at java.net.ServerSocket.accept(ServerSocket.java:421)
  at hudson.TcpSlaveAgentListener.run(TcpSlaveAgentListener.java:117)

Thread-3

"Thread-3" Id=24 TIMED_WAITING on java.util.LinkedHashSet@1b0c08
at java.lang.Object.wait(Native Method)

• waiting on java.util.LinkedHashSet@1b0c08
  at hudson.model.ViewJob$ReloadThread.getNext(ViewJob.java:159)
  at hudson.model.ViewJob$ReloadThread.run(ViewJob.java:175)

pool-1-thread-1

"pool-1-thread-1" Id=23 WAITING on
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1b31fd9
at sun.misc.Unsafe.park(Native Method)

• waiting on
  java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1b31fd9
  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
  at
  java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
  at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:358)
  at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
  at java.lang.Thread.run(Thread.java:619)

Hudson cron thread

"Hudson cron thread" Id=22 TIMED_WAITING on java.util.TaskQueue@efe27b
at java.lang.Object.wait(Native Method)

• waiting on java.util.TaskQueue@efe27b
  at java.util.TimerThread.mainLoop(Timer.java:509)
  at java.util.TimerThread.run(Timer.java:462)

DestroyJavaVM

"DestroyJavaVM" Id=21 RUNNABLE

LauncherControlThread[ControlPort=-1]

"LauncherControlThread[ControlPort=-1]" Id=19 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at winstone.Launcher.run(Launcher.java:279)
at java.lang.Thread.run(Thread.java:619)

ConnectorThread:[http-9000]

"ConnectorThread:[http-9000]" Id=18 RUNNABLE (in native)
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)

• locked java.net.SocksSocketImpl@fe135d
  at java.net.ServerSocket.implAccept(ServerSocket.java:453)
  at java.net.ServerSocket.accept(ServerSocket.java:421)
  at winstone.HttpListener.run(HttpListener.java:127)
  at java.lang.Thread.run(Thread.java:619)

WinstoneHostConfigurationMgmt:default

"WinstoneHostConfigurationMgmt:default" Id=17 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at winstone.HostConfiguration.run(HostConfiguration.java:176)
at java.lang.Thread.run(Thread.java:619)

Java2D Disposer

"Java2D Disposer" Id=15 WAITING on java.lang.ref.ReferenceQueue$Lock@a9509d
at java.lang.Object.wait(Native Method)

• waiting on java.lang.ref.ReferenceQueue$Lock@a9509d
  at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
  at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
  at sun.java2d.Disposer.run(Disposer.java:125)
  at java.lang.Thread.run(Thread.java:619)

WinstoneObjectPoolMgmt

"WinstoneObjectPoolMgmt" Id=13 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at winstone.ObjectPool.run(ObjectPool.java:103)
at java.lang.Thread.run(Thread.java:619)

Signal Dispatcher

"Signal Dispatcher" Id=4 RUNNABLE

Finalizer

"Finalizer" Id=3 WAITING on java.lang.ref.ReferenceQueue$Lock@1eb9fde
at java.lang.Object.wait(Native Method)

• waiting on java.lang.ref.ReferenceQueue$Lock@1eb9fde
  at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
  at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
  at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

Reference Handler

"Reference Handler" Id=2 WAITING on java.lang.ref.Reference$Lock@4caadb
at java.lang.Object.wait(Native Method)

• waiting on java.lang.ref.Reference$Lock@4caadb
  at java.lang.Object.wait(Object.java:485)
  at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)

Hudson ver. 1.321

No slave thread dump is available.

Sure hope this is good information for you!