1. With console enabled, run javaws http://javaweb.sfbay.sun.com/~nn136682/BlobSignedArcTest/normal_signedjar.jnlp
2. Click Run on security dialog
Application launch hangs once every 4-5 times.
Stack show this relevant locking/blocked threads:

"Java Web Start Main Thread" prio=6 tid=0x16f09400 nid=0x450 in Object.wait() [0x17c6f000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x082c4708> (a sun.plugin.util.PluginSysUtil$SysExecutionThreadCreator)
        at java.lang.Object.wait(Object.java:503)
        at sun.plugin.util.PluginSysUtil$SysExecutionThreadCreator.createThread(PluginSysUtil.java:264)
        - locked <0x082c4708> (a sun.plugin.util.PluginSysUtil$SysExecutionThreadCreator)
        at sun.plugin.util.PluginSysUtil.execute(PluginSysUtil.java:151)
        at sun.plugin.util.PluginSysUtil.delegate(PluginSysUtil.java:130)
        at com.sun.deploy.util.DeploySysRun.execute(DeploySysRun.java:29)
        at com.sun.deploy.uitoolkit.impl.awt.ui.SwingConsoleWindow.invokeLater(SwingConsoleWindow.java:501)
        at com.sun.deploy.uitoolkit.impl.awt.ui.SwingConsoleWindow.append(SwingConsoleWindow.java:545)
        at com.sun.deploy.uitoolkit.ui.ConsoleTraceListener$ConsoleWriterThread.flush(ConsoleTraceListener.java:150)
        at com.sun.deploy.uitoolkit.ui.ConsoleTraceListener.flush(ConsoleTraceListener.java:38)
        at com.sun.deploy.trace.Trace.fireFlushEvent(Trace.java:411)
        at com.sun.deploy.trace.Trace.flush(Trace.java:199)
        - locked <0x0806fe90> (a java.util.ArrayList)
        at com.sun.javaws.Main.continueInSecureThread(Main.java:346)
        at com.sun.javaws.Main$1.run(Main.java:175)
        at java.lang.Thread.run(Thread.java:722)

"ConsoleTraceListener" daemon prio=6 tid=0x17d24400 nid=0xb80 in Object.wait() [0x1810f000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x082c4708> (a sun.plugin.util.PluginSysUtil$SysExecutionThreadCreator)
        at java.lang.Object.wait(Object.java:503)
        at sun.plugin.util.PluginSysUtil$SysExecutionThreadCreator.createThread(PluginSysUtil.java:264)
        - locked <0x082c4708> (a sun.plugin.util.PluginSysUtil$SysExecutionThreadCreator)
        at sun.plugin.util.PluginSysUtil.execute(PluginSysUtil.java:151)
        at sun.plugin.util.PluginSysUtil.delegate(PluginSysUtil.java:130)
        at com.sun.deploy.util.DeploySysRun.execute(DeploySysRun.java:29)
        at com.sun.deploy.uitoolkit.impl.awt.ui.SwingConsoleWindow.invokeLater(SwingConsoleWindow.java:501)
        at com.sun.deploy.uitoolkit.impl.awt.ui.SwingConsoleWindow.append(SwingConsoleWindow.java:545)
        at com.sun.deploy.uitoolkit.ui.ConsoleTraceListener$ConsoleWriterThread.run(ConsoleTraceListener.java:136)

"ProgressReporter" daemon prio=4 tid=0x17e80400 nid=0x54c waiting for monitor entry [0x18b4f000]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at com.sun.deploy.trace.Trace.enQueue(Trace.java:314)
        - waiting to lock <0x0806fe90> (a java.util.ArrayList)
        at com.sun.deploy.trace.Trace.println(Trace.java:333)
        at com.sun.javaws.progress.PreloaderDelegate$ProgressQueueChecker.run(PreloaderDelegate.java:767)
        at java.lang.Thread.run(Thread.java:722)

"thread applet-ArcTest-1" prio=4 tid=0x17e8e800 nid=0x824 waiting for monitor entry [0x18aff000]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at com.sun.deploy.trace.Trace.enQueue(Trace.java:314)
        - waiting to lock <0x0806fe90> (a java.util.ArrayList)
        at com.sun.deploy.trace.Trace.msgPrintln(Trace.java:354)
        at com.sun.deploy.trace.Trace.msgSecurityPrintln(Trace.java:567)
        at com.sun.deploy.security.TrustDecider.validateChain(TrustDecider.java:758)
        at com.sun.deploy.security.TrustDecider.isAllPermissionGranted(TrustDecider.java:904)
        - locked <0x082c3ec0> (a java.lang.Class for com.sun.deploy.security.TrustDecider)
        at com.sun.javaws.security.AppPolicy.grantUnrestrictedAccess(AppPolicy.java:261)
        at com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedResourcesHelper(JNLPSignedResourcesHelper.java:534)
        at com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedResources(JNLPSignedResourcesHelper.java:170)
        at sun.plugin2.applet.JNLP2Manager.prepareLaunchFile(JNLP2Manager.java:1484)
        at sun.plugin2.applet.JNLP2Manager.loadJarFiles(JNLP2Manager.java:457)
        at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Plugin2Manager.java:1545)
        at java.lang.Thread.run(Thread.java:722)