High CPU and not responsive every time when someone attempts to rename an existing job.

Here's the thread stack from the JavaMelody

Handling POST /job/[job_name]/doRename from [client ip address] : RequestHandlerThread368
java.io.UnixFileSystem.list(Native Method)
java.io.File.list(File.java:1116)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1257)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1287)
org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1211)
org.apache.tools.ant.DirectoryScanner.checkIncludePatterns(DirectoryScanner.java:1030)
org.apache.tools.ant.DirectoryScanner.scan(DirectoryScanner.java:909)
hudson.plugins.scm_sync_configuration.strategies.model.PatternsEntityMatcher.matchingFilesFrom(PatternsEntityMatcher.java:77)
hudson.plugins.scm_sync_configuration.strategies.model.JobOrFolderConfigurationEntityMatcher.matchingFilesFrom(JobOrFolderConfigurationEntityMatcher.java:103)
hudson.plugins.scm_sync_configuration.strategies.AbstractScmSyncStrategy.collect(AbstractScmSyncStrategy.java:114)
hudson.plugins.scm_sync_configuration.ScmSyncConfigurationPlugin$3.apply(ScmSyncConfigurationPlugin.java:261)
hudson.plugins.scm_sync_configuration.ScmSyncConfigurationPlugin$3.apply(ScmSyncConfigurationPlugin.java:258)
com.google.common.collect.Iterators$8.next(Iterators.java:812)
com.google.common.collect.Iterables$3.next(Iterables.java:508)
com.google.common.collect.Iterables$3.next(Iterables.java:501)
com.google.common.collect.Iterators$5.hasNext(Iterators.java:544)
hudson.plugins.scm_sync_configuration.transactions.ScmTransaction.registerRenamedPath(ScmTransaction.java:56)
hudson.plugins.scm_sync_configuration.extensions.ScmSyncConfigurationItemListener.onLocationChanged(ScmSyncConfigurationItemListener.java:94)
hudson.model.listeners.ItemListener$6.apply(ItemListener.java:238)
hudson.model.listeners.ItemListener$6.apply(ItemListener.java:236)
hudson.model.listeners.ItemListener.forAll(ItemListener.java:167)
hudson.model.listeners.ItemListener.fireLocationChange(ItemListener.java:236)
hudson.model.AbstractItem.renameTo(AbstractItem.java:335)
hudson.model.Job.renameTo(Job.java:659)
hudson.model.Job.doDoRename(Job.java:1502)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:324)
org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:52)
org.kohsuke.stapler.PreInvokeInterceptedFunction.invoke(PreInvokeInterceptedFunction.java:26)
org.kohsuke.stapler.Function.bindAndInvoke(Function.java:167)
org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:100)
org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:124)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:233)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
org.kohsuke.stapler.Stapler.service(Stapler.java:238)
javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135)
hudson.plugins.audit_trail.AuditTrailFilter.doFilter(AuditTrailFilter.java:95)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:201)
net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:178)
net.bull.javamelody.PluginMonitoringFilter.doFilter(PluginMonitoringFilter.java:85)
org.jvnet.hudson.plugins.monitoring.HudsonMonitoringFilter.doFilter(HudsonMonitoringFilter.java:104)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
hudson.plugins.scm_sync_configuration.extensions.ScmSyncConfigurationFilter$1.call(ScmSyncConfigurationFilter.java:49)
hudson.plugins.scm_sync_configuration.extensions.ScmSyncConfigurationFilter$1.call(ScmSyncConfigurationFilter.java:44)
hudson.plugins.scm_sync_configuration.ScmSyncConfigurationDataProvider.provideRequestDuring(ScmSyncConfigurationDataProvider.java:106)
hudson.plugins.scm_sync_configuration.extensions.ScmSyncConfigurationFilter.doFilter(ScmSyncConfigurationFilter.java:44)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:126)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:49)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:553)
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
org.eclipse.jetty.server.Server.handle(Server.java:499)
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
java.lang.Thread.run(Thread.java:745)