Here are three thread dumps during a single hang:

threadDump #1

Executor #-1 for master : executing driver-smoketest.linux #1235

"Executor #-1 for master : executing driver-smoketest.linux #1235" Id=374602 Group=main BLOCKED on winstone.classLoader.WebappClassLoader@77ce3fc5 owned by "pool-3-thread-1820" Id=406115
	at winstone.classLoader.WebappClassLoader.loadClass(WebappClassLoader.java:48)
	-  blocked on winstone.classLoader.WebappClassLoader@77ce3fc5
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
	at javax.xml.parsers.FactoryFinder.getProviderClass(FactoryFinder.java:109)
	at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:144)
	at javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:231)
	at javax.xml.parsers.SAXParserFactory.newInstance(SAXParserFactory.java:125)
	at org.apache.commons.digester.Digester.getFactory(Digester.java:490)
	at org.apache.commons.digester.Digester.getParser(Digester.java:693)
	at org.apache.commons.digester.Digester.getXMLReader(Digester.java:899)
	at org.apache.commons.digester.Digester.parse(Digester.java:1631)
	at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:49)
	at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:24)
	at hudson.model.AbstractBuild.calcChangeSet(AbstractBuild.java:832)
	at hudson.model.AbstractBuild.getChangeSet(AbstractBuild.java:806)
	at hudson.model.AbstractBuild.hasParticipant(AbstractBuild.java:358)
	at hudson.model.AbstractProject.hasParticipant(AbstractProject.java:1419)
	at hudson.model.User.getProjects(User.java:409)
	at hudson.scm.MailAddressResolverImpl.findMailAddressFor(MailAddressResolverImpl.java:21)
	at hudson.tasks.MailAddressResolver.resolve(MailAddressResolver.java:100)
	at hudson.tasks.Mailer$UserProperty.getAddress(Mailer.java:530)
	at hudson.plugins.emailext.ExtendedEmailPublisher.createMail(ExtendedEmailPublisher.java:396)
	at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:273)
	at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:265)
	at hudson.plugins.emailext.ExtendedEmailPublisher.access$100(ExtendedEmailPublisher.java:69)
	at hudson.plugins.emailext.ExtendedEmailPublisher$1.endBuild(ExtendedEmailPublisher.java:600)
	at hudson.matrix.MatrixBuild$MatrixBuildExecution.post2(MatrixBuild.java:381)
	at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:639)
	at hudson.model.Run.execute(Run.java:1513)
	at hudson.matrix.MatrixBuild.run(MatrixBuild.java:287)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:236)
	at hudson.model.OneOffExecutor.run(OneOffExecutor.java:66)

threadDump #2

Executor #-1 for master : executing driver-smoketest.linux #1235

"Executor #-1 for master : executing driver-smoketest.linux #1235" Id=374602 Group=main RUNNABLE
	at java.lang.Throwable.getStackTraceElement(Native Method)
	at java.lang.Throwable.getOurStackTrace(Throwable.java:608)
	-  locked java.lang.Throwable@7b0035af
	at java.lang.Throwable.getStackTrace(Throwable.java:599)
	at org.apache.commons.logging.impl.Jdk14Logger.log(Jdk14Logger.java:89)
	at org.apache.commons.logging.impl.Jdk14Logger.debug(Jdk14Logger.java:114)
	at org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:814)
	at org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:433)
	at org.apache.commons.digester.SetPropertiesRule.begin(SetPropertiesRule.java:251)
	at org.apache.commons.digester.Rule.begin(Rule.java:152)
	at org.apache.commons.digester.Digester.startElement(Digester.java:1361)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:504)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1340)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2732)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:625)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:488)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:812)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:741)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1208)
	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:525)
	at org.apache.commons.digester.Digester.parse(Digester.java:1631)
	at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:49)
	at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:24)
	at hudson.model.AbstractBuild.calcChangeSet(AbstractBuild.java:832)
	at hudson.model.AbstractBuild.getChangeSet(AbstractBuild.java:806)
	at hudson.model.AbstractBuild.hasParticipant(AbstractBuild.java:358)
	at hudson.model.AbstractProject.hasParticipant(AbstractProject.java:1419)
	at hudson.model.User.getProjects(User.java:409)
	at hudson.scm.MailAddressResolverImpl.findMailAddressFor(MailAddressResolverImpl.java:21)
	at hudson.tasks.MailAddressResolver.resolve(MailAddressResolver.java:100)
	at hudson.tasks.Mailer$UserProperty.getAddress(Mailer.java:530)
	at hudson.plugins.emailext.ExtendedEmailPublisher.createMail(ExtendedEmailPublisher.java:396)
	at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:273)
	at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:265)
	at hudson.plugins.emailext.ExtendedEmailPublisher.access$100(ExtendedEmailPublisher.java:69)
	at hudson.plugins.emailext.ExtendedEmailPublisher$1.endBuild(ExtendedEmailPublisher.java:600)
	at hudson.matrix.MatrixBuild$MatrixBuildExecution.post2(MatrixBuild.java:381)
	at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:639)
	at hudson.model.Run.execute(Run.java:1513)
	at hudson.matrix.MatrixBuild.run(MatrixBuild.java:287)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:236)
	at hudson.model.OneOffExecutor.run(OneOffExecutor.java:66)

threadDump #3

Executor #-1 for master : executing driver-smoketest.linux #1235

"Executor #-1 for master : executing driver-smoketest.linux #1235" Id=374602 Group=main RUNNABLE
	at java.lang.Throwable.getStackTraceElement(Native Method)
	at java.lang.Throwable.getOurStackTrace(Throwable.java:608)
	-  locked java.lang.Throwable@1c5b510e
	at java.lang.Throwable.getStackTrace(Throwable.java:599)
	at org.apache.commons.logging.impl.Jdk14Logger.log(Jdk14Logger.java:89)
	at org.apache.commons.logging.impl.Jdk14Logger.debug(Jdk14Logger.java:114)
	at org.apache.commons.digester.Digester.startDocument(Digester.java:1283)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startDocument(AbstractSAXParser.java:287)
	at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startDocument(XMLDTDValidator.java:666)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.startEntity(XMLDocumentScannerImpl.java:565)
	at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.startDocumentParsing(XMLVersionDetector.java:175)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:790)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:741)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1208)
	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:525)
	at org.apache.commons.digester.Digester.parse(Digester.java:1631)
	at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:49)
	at hudson.plugins.mercurial.MercurialChangeLogParser.parse(MercurialChangeLogParser.java:24)
	at hudson.model.AbstractBuild.calcChangeSet(AbstractBuild.java:832)
	at hudson.model.AbstractBuild.getChangeSet(AbstractBuild.java:806)
	at hudson.model.AbstractBuild.hasParticipant(AbstractBuild.java:358)
	at hudson.model.AbstractProject.hasParticipant(AbstractProject.java:1419)
	at hudson.model.User.getProjects(User.java:409)
	at hudson.scm.MailAddressResolverImpl.findMailAddressFor(MailAddressResolverImpl.java:21)
	at hudson.tasks.MailAddressResolver.resolve(MailAddressResolver.java:100)
	at hudson.tasks.Mailer$UserProperty.getAddress(Mailer.java:530)
	at hudson.plugins.emailext.ExtendedEmailPublisher.createMail(ExtendedEmailPublisher.java:396)
	at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:273)
	at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:265)
	at hudson.plugins.emailext.ExtendedEmailPublisher.access$100(ExtendedEmailPublisher.java:69)
	at hudson.plugins.emailext.ExtendedEmailPublisher$1.endBuild(ExtendedEmailPublisher.java:600)
	at hudson.matrix.MatrixBuild$MatrixBuildExecution.post2(MatrixBuild.java:381)
	at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:639)
	at hudson.model.Run.execute(Run.java:1513)
	at hudson.matrix.MatrixBuild.run(MatrixBuild.java:287)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:236)
	at hudson.model.OneOffExecutor.run(OneOffExecutor.java:66)
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