Somewhat the client can hang and take 100% CPU while syncing

I have 2 accounts. Last sync was a few month ago. I synced both today, and the sync agent synced the first one properly, then hanged while starting the second one:

Syncing 9722xxxxxxx from period: August 2010 2011-01-13 22:17:54 Full thread dump Java HotSpot(TM) 64-Bit Server VM (19.0-b09 mixed mode):

"Image Animator 3" daemon prio=10 tid=0x00007f53202a0800 nid=0x4620 sleeping[0x00007f5327f5a000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at sun.awt.image.GifFrame.dispose(GifImageDecoder.java:653) at sun.awt.image.GifImageDecoder.readImage(GifImageDecoder.java:441) at sun.awt.image.GifImageDecoder.produceImage(GifImageDecoder.java:195) at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:246) at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:172) at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)

"JS executor for com.gargoylesoftware.htmlunit.WebClient@1e1ebbf6" daemon prio=10 tid=0x00007f5330249000 nid=0x461f sleeping[0x00007f5335c0e000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at com.gargoylesoftware.htmlunit.javascript.background.JavaScriptExecutor.run(JavaScriptExecutor.java:168) at java.lang.Thread.run(Thread.java:662)

"TimerQueue" daemon prio=10 tid=0x00000000431c9800 nid=0x461c in Object.wait() [0x00007f5329ae9000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method)

waiting on <0x00000000f04849c8> (a javax.swing.TimerQueue) at javax.swing.TimerQueue.run(TimerQueue.java:232)
locked <0x00000000f04849c8> (a javax.swing.TimerQueue) at java.lang.Thread.run(Thread.java:662)

"AWT-EventQueue-0" prio=10 tid=0x00007f53311ea800 nid=0x461b waiting on condition [0x00007f5329be9000] java.lang.Thread.State: RUNNABLE at javax.swing.BufferStrategyPaintManager.fetchRoot(BufferStrategyPaintManager.java:558) at javax.swing.BufferStrategyPaintManager.prepare(BufferStrategyPaintManager.java:493) at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:264) at javax.swing.RepaintManager.paint(RepaintManager.java:1224) at javax.swing.JComponent._paintImmediately(JComponent.java:5072) at javax.swing.JComponent.paintImmediately(JComponent.java:4882) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:785) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:713) at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:693) at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:125) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

"AWT-Shutdown" prio=10 tid=0x00007f53321be800 nid=0x461a in Object.wait() [0x00007f532f523000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method)

waiting on <0x00000000f0110060> (a java.lang.Object) at java.lang.Object.wait(Object.java:485) at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:265)
locked <0x00000000f0110060> (a java.lang.Object) at java.lang.Thread.run(Thread.java:662)

"AWT-XAWT" daemon prio=10 tid=0x00007f53328b8000 nid=0x4618 runnable [0x00007f532f624000] java.lang.Thread.State: RUNNABLE at sun.awt.X11.XToolkit.waitForEvents(Native Method) at sun.awt.X11.XToolkit.run(XToolkit.java:579) at sun.awt.X11.XToolkit.run(XToolkit.java:543) at java.lang.Thread.run(Thread.java:662)

"Java2D Disposer" daemon prio=10 tid=0x00007f533148e000 nid=0x4617 in Object.wait() [0x00007f533414c000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method)

waiting on <0x00000000f0100850> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
locked <0x00000000f0100850> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134) at sun.java2d.Disposer.run(Disposer.java:127) at java.lang.Thread.run(Thread.java:662)

"Timer-0" daemon prio=10 tid=0x00000000425fe000 nid=0x4616 in Object.wait() [0x00007f5335305000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method)

waiting on <0x00000000f011c5c0> (a java.util.TaskQueue) at java.lang.Object.wait(Object.java:485) at java.util.TimerThread.mainLoop(Timer.java:483)
locked <0x00000000f011c5c0> (a java.util.TaskQueue) at java.util.TimerThread.run(Timer.java:462)

"ForkJoinScheduler" prio=10 tid=0x00007f5330e15000 nid=0x4615 in Object.wait() [0x00007f5335406000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method)

waiting on <0x00000000f011c890> (a scala.actors.scheduler.ForkJoinScheduler) at scala.actors.scheduler.ForkJoinScheduler.liftedTree1$1(ForkJoinScheduler.scala:70) at scala.actors.scheduler.ForkJoinScheduler.run(ForkJoinScheduler.scala:69)
locked <0x00000000f011c890> (a scala.actors.scheduler.ForkJoinScheduler) at java.lang.Thread.run(Thread.java:662)

"ForkJoinPool-1-worker-7" daemon prio=10 tid=0x00007f5331156800 nid=0x4614 waiting on condition [0x00007f5335507000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)

parking to wait for <0x00000000f098f408> (a scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode.awaitSyncRelease(ForkJoinPool.java:1340) at scala.concurrent.forkjoin.ForkJoinPool.sync(ForkJoinPool.java:1417) at scala.concurrent.forkjoin.ForkJoinWorkerThread.mainLoop(ForkJoinWorkerThread.java:342) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:325)

"ForkJoinPool-1-worker-6" daemon prio=10 tid=0x00007f5332d10000 nid=0x4613 waiting on condition [0x00007f5335608000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)

parking to wait for <0x00000000f098bc90> (a scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode.awaitSyncRelease(ForkJoinPool.java:1340) at scala.concurrent.forkjoin.ForkJoinPool.sync(ForkJoinPool.java:1417) at scala.concurrent.forkjoin.ForkJoinWorkerThread.mainLoop(ForkJoinWorkerThread.java:342) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:325)

"ForkJoinPool-1-worker-5" daemon prio=10 tid=0x00007f5331097800 nid=0x4612 waiting on condition [0x00007f5335709000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)

parking to wait for <0x00000000f098bcb0> (a scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode.awaitSyncRelease(ForkJoinPool.java:1340) at scala.concurrent.forkjoin.ForkJoinPool.sync(ForkJoinPool.java:1417) at scala.concurrent.forkjoin.ForkJoinWorkerThread.mainLoop(ForkJoinWorkerThread.java:342) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:325)

"ForkJoinPool-1-worker-4" daemon prio=10 tid=0x00007f5331ec2000 nid=0x4611 waiting on condition [0x00007f533580a000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)

parking to wait for <0x00000000f098bcd0> (a scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode.awaitSyncRelease(ForkJoinPool.java:1340) at scala.concurrent.forkjoin.ForkJoinPool.sync(ForkJoinPool.java:1417) at scala.concurrent.forkjoin.ForkJoinWorkerThread.mainLoop(ForkJoinWorkerThread.java:342) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:325)

"ForkJoinPool-1-worker-3" daemon prio=10 tid=0x00007f53312f8800 nid=0x4610 waiting on condition [0x00007f533590b000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)

parking to wait for <0x00000000f098bcf0> (a scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode.awaitSyncRelease(ForkJoinPool.java:1340) at scala.concurrent.forkjoin.ForkJoinPool.sync(ForkJoinPool.java:1417) at scala.concurrent.forkjoin.ForkJoinWorkerThread.mainLoop(ForkJoinWorkerThread.java:342) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:325)

"ForkJoinPool-1-worker-2" daemon prio=10 tid=0x00007f533105f800 nid=0x460f waiting on condition [0x00007f5335a0c000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)

parking to wait for <0x00000000f098bd10> (a scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode.awaitSyncRelease(ForkJoinPool.java:1340) at scala.concurrent.forkjoin.ForkJoinPool.sync(ForkJoinPool.java:1417) at scala.concurrent.forkjoin.ForkJoinWorkerThread.mainLoop(ForkJoinWorkerThread.java:342) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:325)

"ForkJoinPool-1-worker-1" daemon prio=10 tid=0x00007f533252e800 nid=0x460e waiting on condition [0x00007f5335b0d000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)

parking to wait for <0x00000000f098bd30> (a scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode.awaitSyncRelease(ForkJoinPool.java:1340) at scala.concurrent.forkjoin.ForkJoinPool.sync(ForkJoinPool.java:1417) at scala.concurrent.forkjoin.ForkJoinWorkerThread.mainLoop(ForkJoinWorkerThread.java:342) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:325)

"ForkJoinPool-1-worker-0" daemon prio=10 tid=0x00007f5330b92800 nid=0x460d waiting on condition [0x00007f5335e23000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method)

parking to wait for <0x00000000f098bd50> (a scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at scala.concurrent.forkjoin.ForkJoinPool$WaitQueueNode.awaitSyncRelease(ForkJoinPool.java:1340) at scala.concurrent.forkjoin.ForkJoinPool.sync(ForkJoinPool.java:1417) at scala.concurrent.forkjoin.ForkJoinWorkerThread.mainLoop(ForkJoinWorkerThread.java:342) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:325)

"Low Memory Detector" daemon prio=10 tid=0x00007f5330001000 nid=0x45eb runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE

"CompilerThread1" daemon prio=10 tid=0x0000000041b70800 nid=0x45ea waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE

"CompilerThread0" daemon prio=10 tid=0x0000000041b6d800 nid=0x45e9 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" daemon prio=10 tid=0x0000000041b6b000 nid=0x45e8 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE

"Finalizer" daemon prio=10 tid=0x0000000041b4c000 nid=0x45e7 in Object.wait() [0x00007f5336d6b000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method)

waiting on <0x00000000f000db60> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
locked <0x00000000f000db60> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

"Reference Handler" daemon prio=10 tid=0x0000000041b44800 nid=0x45e6 in Object.wait() [0x00007f5336e6c000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method)

waiting on <0x00000000f009be50> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:485) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
locked <0x00000000f009be50> (a java.lang.ref.Reference$Lock)

"main" prio=10 tid=0x0000000041abb800 nid=0x45e0 in Object.wait() [0x00007f533bb09000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method)

waiting on <0x00000000f040ea48> (a java.awt.EventDispatchThread) at java.lang.Thread.join(Thread.java:1186)
locked <0x00000000f040ea48> (a java.awt.EventDispatchThread) at java.lang.Thread.join(Thread.java:1239) at sbt.TrapExit$.sbt$TrapExit$$waitOnThread(TrapExit.scala:79) at sbt.TrapExit$$anonfun$waitForExit$1.apply(TrapExit.scala:69) at sbt.TrapExit$$anonfun$waitForExit$1.apply(TrapExit.scala:65) at scala.Iterator$class.foreach(Iterator.scala:414) at scala.collection.mutable.ResizableArray$$anon$1.foreach(ResizableArray.scala:66) at scala.Iterable$class.foreach(Iterable.scala:256) at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:26) at sbt.TrapExit$.processThreads(TrapExit.scala:132) at sbt.TrapExit$.waitForExit(TrapExit.scala:65) at sbt.TrapExit$.apply(TrapExit.scala:53) at sbt.Run$.executeTrapExit(Run.scala:91) at sbt.Run.run(Run.scala:51) at sbt.ScalaProject$$anonfun$runTask$2.apply(ScalaProject.scala:161) at sbt.ScalaProject$$anonfun$runTask$2.apply(ScalaProject.scala:159) at sbt.TaskManager$Task.invoke(TaskManager.scala:62) at sbt.impl.RunTask.doRun$1(RunTask.scala:77) at sbt.impl.RunTask.runTask(RunTask.scala:85) at sbt.impl.RunTask.run(RunTask.scala:32) at sbt.impl.RunTask$.apply(RunTask.scala:17) at sbt.impl.RunTask$.apply(RunTask.scala:16) at sbt.Project$class.run(Project.scala:98) at sbt.Project$class.call(Project.scala:93) at sbt.BasicScalaProject.call(DefaultProject.scala:21) at sbt.xMain$$anonfun$7.apply(Main.scala:530) at sbt.xMain$$anonfun$7.apply(Main.scala:530) at sbt.xMain.withAction(Main.scala:559) at sbt.xMain.sbt$xMain$$handleAction(Main.scala:530) at sbt.xMain.handleCommand(Main.scala:520) at sbt.xMain.processAction(Main.scala:459) at sbt.xMain.process$1(Main.scala:257) at sbt.xMain.processArguments(Main.scala:266) at sbt.xMain.startProject(Main.scala:107) at sbt.xMain.run(Main.scala:84) at sbt.xMain.run0$1(Main.scala:35) at sbt.xMain.run(Main.scala:42) at xsbt.boot.Launch$.run(Launch.scala:53) at xsbt.boot.Launch$$anonfun$explicit$1.apply(Launch.scala:42) at xsbt.boot.Launch$$anonfun$explicit$1.apply(Launch.scala:42) at xsbt.boot.Launch$.launch(Launch.scala:57) at xsbt.boot.Launch$.explicit(Launch.scala:42) at xsbt.boot.Launch$.initialized(Launch.scala:38) at xsbt.boot.Launch$.parsed(Launch.scala:31) at xsbt.boot.Launch$.configured(Launch.scala:21) at xsbt.boot.Launch$.apply(Launch.scala:16) at xsbt.boot.Launch$.apply(Launch.scala:13) at xsbt.boot.Boot$.runImpl(Boot.scala:24) at xsbt.boot.Boot$.run(Boot.scala:19) at xsbt.boot.Boot$.main(Boot.scala:15) at xsbt.boot.Boot.main(Boot.scala)

"VM Thread" prio=10 tid=0x0000000041b40800 nid=0x45e5 runnable

"GC task thread#0 (ParallelGC)" prio=10 tid=0x0000000041ace800 nid=0x45e1 runnable

"GC task thread#1 (ParallelGC)" prio=10 tid=0x0000000041ad0800 nid=0x45e2 runnable

"GC task thread#2 (ParallelGC)" prio=10 tid=0x0000000041ad2800 nid=0x45e3 runnable

"GC task thread#3 (ParallelGC)" prio=10 tid=0x0000000041ad4800 nid=0x45e4 runnable

"VM Periodic Task Thread" prio=10 tid=0x00007f533000c000 nid=0x45ec waiting on condition

JNI global references: 2088

Heap PSYoungGen total 87296K, used 476K [0x00000000faab0000, 0x0000000100000000, 0x0000000100000000) eden space 87232K, 0% used [0x00000000faab0000,0x00000000fab27178,0x00000000fffe0000) from space 64K, 0% used [0x00000000fffe0000,0x00000000fffe0000,0x00000000ffff0000) to space 64K, 0% used [0x00000000ffff0000,0x00000000ffff0000,0x0000000100000000) PSOldGen total 174784K, used 9790K [0x00000000f0000000, 0x00000000faab0000, 0x00000000faab0000) object space 174784K, 5% used [0x00000000f0000000,0x00000000f098f880,0x00000000faab0000) PSPermGen total 83968K, used 83967K [0x00000000eae00000, 0x00000000f0000000, 0x00000000f0000000) object space 83968K, 99% used [0x00000000eae00000,0x00000000effffd60,0x00000000f0000000)

spendchart / banksync

Somewhat the client can hang and take 100% CPU while syncing #2