Re: Compile of project hangs with 100% CPU used (GWT 2.7.0)

Oops, wrong copy-paste for the idle processes, this is the right one:

2015-01-05 13:07:21
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode):


"Attach Listener" #14 daemon prio=9 os_prio=0 tid=0x00007f98b8001000 nid=0x5487 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"Service Thread" #10 daemon prio=9 os_prio=0 tid=0x00007f993c1e8800 nid=0x217 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C1 CompilerThread3" #9 daemon prio=9 os_prio=0 tid=0x00007f993c1db800 nid=0x211 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C2 CompilerThread2" #8 daemon prio=9 os_prio=0 tid=0x00007f993c1d7000 nid=0x210 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C2 CompilerThread1" #7 daemon prio=9 os_prio=0 tid=0x00007f993c1d5000 nid=0x207 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C2 CompilerThread0" #6 daemon prio=9 os_prio=0 tid=0x00007f993c1d2800 nid=0x206 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"Signal Dispatcher" #5 daemon prio=9 os_prio=0 tid=0x00007f993c1d0800 nid=0x204 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"Surrogate Locker Thread (Concurrent GC)" #4 daemon prio=9 os_prio=0 tid=0x00007f993c1ce800 nid=0x1fd waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007f993c1a1800 nid=0x1ef in Object.wait() [0x00007f98e0f28000]
   java.lang.Thread.State: WAITING (on object monitor)
 at java.lang.Object.wait(Native Method)
 - waiting on <0x00000000803ec160> (a java.lang.ref.ReferenceQueue$Lock)
 at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:142)
 - locked <0x00000000803ec160> (a java.lang.ref.ReferenceQueue$Lock)
 at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:158)
 at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)


"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007f993c19f800 nid=0x1ee in Object.wait() [0x00007f98e1029000]
   java.lang.Thread.State: WAITING (on object monitor)
 at java.lang.Object.wait(Native Method)
 - waiting on <0x00000000803ec1a0> (a java.lang.ref.Reference$Lock)
 at java.lang.Object.wait(Object.java:502)
 at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157)
 - locked <0x00000000803ec1a0> (a java.lang.ref.Reference$Lock)


"main" #1 prio=5 os_prio=0 tid=0x00007f993c00f800 nid=0x198 runnable [0x00007f9944d22000]
   java.lang.Thread.State: RUNNABLE
 at java.net.SocketInputStream.socketRead0(Native Method)
 at java.net.SocketInputStream.read(SocketInputStream.java:150)
 at java.net.SocketInputStream.read(SocketInputStream.java:121)
 at java.net.SocketInputStream.read(SocketInputStream.java:203)
 at java.io.ObjectInputStream$PeekInputStream.peek(ObjectInputStream.java:2296)
 at java.io.ObjectInputStream$BlockDataInputStream.readBlockHeader(ObjectInputStream.java:2476)
 at java.io.ObjectInputStream$BlockDataInputStream.refill(ObjectInputStream.java:2546)
 at java.io.ObjectInputStream$BlockDataInputStream.read(ObjectInputStream.java:2618)
 at java.io.ObjectInputStream$BlockDataInputStream.readBoolean(ObjectInputStream.java:2759)
 at java.io.ObjectInputStream.readBoolean(ObjectInputStream.java:906)
 at com.google.gwt.dev.CompilePermsServer.run(CompilePermsServer.java:285)
 at com.google.gwt.dev.CompilePermsServer.main(CompilePermsServer.java:246)


"VM Thread" os_prio=0 tid=0x00007f993c198800 nid=0x1eb runnable


"Gang worker#0 (Parallel GC Threads)" os_prio=0 tid=0x00007f993c024000 nid=0x1c0 runnable


"Gang worker#1 (Parallel GC Threads)" os_prio=0 tid=0x00007f993c026000 nid=0x1c4 runnable


"Gang worker#2 (Parallel GC Threads)" os_prio=0 tid=0x00007f993c027800 nid=0x1c7 runnable


"Gang worker#3 (Parallel GC Threads)" os_prio=0 tid=0x00007f993c029800 nid=0x1ca runnable


"Gang worker#4 (Parallel GC Threads)" os_prio=0 tid=0x00007f993c02b000 nid=0x1cc runnable


"Gang worker#5 (Parallel GC Threads)" os_prio=0 tid=0x00007f993c02d000 nid=0x1ce runnable


"Gang worker#6 (Parallel GC Threads)" os_prio=0 tid=0x00007f993c02e800 nid=0x1d0 runnable


"Gang worker#7 (Parallel GC Threads)" os_prio=0 tid=0x00007f993c030000 nid=0x1d2 runnable


"G1 Main Concurrent Mark GC Thread" os_prio=0 tid=0x00007f993c04a000 nid=0x1e2 runnable


"Gang worker#0 (G1 Parallel Marking Threads)" os_prio=0 tid=0x00007f993c04c000 nid=0x1e3 runnable


"Gang worker#1 (G1 Parallel Marking Threads)" os_prio=0 tid=0x00007f993c04d800 nid=0x1e4 runnable


"G1 Concurrent Refinement Thread#0" os_prio=0 tid=0x00007f993c041000 nid=0x1df runnable


"G1 Concurrent Refinement Thread#1" os_prio=0 tid=0x00007f993c03f800 nid=0x1de runnable


"G1 Concurrent Refinement Thread#2" os_prio=0 tid=0x00007f993c03d800 nid=0x1dd runnable


"G1 Concurrent Refinement Thread#3" os_prio=0 tid=0x00007f993c03c000 nid=0x1dc runnable


"G1 Concurrent Refinement Thread#4" os_prio=0 tid=0x00007f993c03a000 nid=0x1db runnable


"G1 Concurrent Refinement Thread#5" os_prio=0 tid=0x00007f993c038800 nid=0x1da runnable


"G1 Concurrent Refinement Thread#6" os_prio=0 tid=0x00007f993c036800 nid=0x1d8 runnable


"G1 Concurrent Refinement Thread#7" os_prio=0 tid=0x00007f993c035000 nid=0x1d7 runnable


"G1 Concurrent Refinement Thread#8" os_prio=0 tid=0x00007f993c033000 nid=0x1d5 runnable


"VM Periodic Task Thread" os_prio=0 tid=0x00007f993c1eb800 nid=0x219 waiting on condition


JNI global references: 105

--

Andreas

On Monday, January 5, 2015 2:10:38 PM UTC+1, Andreas Kohn wrote:

Hi,

one of our automatic builds of our application got stuck, and executing `jstack` on the process eating 100% CPU gives this:

2015-01-05 12:52:03
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode):


"Attach Listener" #14 daemon prio=9 os_prio=0 tid=0x00007f1fa0001000 nid=0x536c waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"jscompiler" #13 prio=5 os_prio=0 tid=0x00007f20289f4000 nid=0x22c runnable [0x00007f1fc1ffd000]
   java.lang.Thread.State: RUNNABLE
 at com.google.gwt.thirdparty.guava.common.collect.AbstractMultimap.keySet(AbstractMultimap.java:150)
 at com.google.gwt.thirdparty.guava.common.collect.HashMultimap.keySet(HashMultimap.java:49)
 at com.google.gwt.thirdparty.guava.common.collect.HashMultimap.<init>(HashMultimap.java:101)
 at com.google.gwt.thirdparty.guava.common.collect.HashMultimap.create(HashMultimap.java:87)
 at com.google.gwt.thirdparty.javascript.jscomp.MaybeReachingVariableUse$ReachingUses.<init>(MaybeReachingVariableUse.java:98)
 at com.google.gwt.thirdparty.javascript.jscomp.MaybeReachingVariableUse.flowThrough(MaybeReachingVariableUse.java:148)
 at com.google.gwt.thirdparty.javascript.jscomp.MaybeReachingVariableUse.flowThrough(MaybeReachingVariableUse.java:44)
 at com.google.gwt.thirdparty.javascript.jscomp.DataFlowAnalysis.flow(DataFlowAnalysis.java:275)
 at com.google.gwt.thirdparty.javascript.jscomp.DataFlowAnalysis.analyze(DataFlowAnalysis.java:212)
 at com.google.gwt.thirdparty.javascript.jscomp.DataFlowAnalysis.analyze(DataFlowAnalysis.java:180)
 at com.google.gwt.thirdparty.javascript.jscomp.FlowSensitiveInlineVariables.enterScope(FlowSensitiveInlineVariables.java:151)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.pushScope(NodeTraversal.java:600)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseFunction(NodeTraversal.java:558)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:528)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:534)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:534)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:534)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:534)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseRoots(NodeTraversal.java:314)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseRoots(NodeTraversal.java:295)
 at com.google.gwt.thirdparty.javascript.jscomp.FlowSensitiveInlineVariables.process(FlowSensitiveInlineVariables.java:175)
 at com.google.gwt.thirdparty.javascript.jscomp.PhaseOptimizer$NamedPass.process(PhaseOptimizer.java:271)
 at com.google.gwt.thirdparty.javascript.jscomp.PhaseOptimizer.process(PhaseOptimizer.java:215)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.optimize(Compiler.java:1945)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.compileInternal(Compiler.java:774)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.access$000(Compiler.java:86)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler$2.call(Compiler.java:655)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler$2.call(Compiler.java:652)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler$3.call(Compiler.java:699)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)


"Service Thread" #10 daemon prio=9 os_prio=0 tid=0x00007f20281f8800 nid=0x21b runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C1 CompilerThread3" #9 daemon prio=9 os_prio=0 tid=0x00007f20281db800 nid=0x20e waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C2 CompilerThread2" #8 daemon prio=9 os_prio=0 tid=0x00007f20281d7000 nid=0x20d waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C2 CompilerThread1" #7 daemon prio=9 os_prio=0 tid=0x00007f20281d5000 nid=0x20c waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C2 CompilerThread0" #6 daemon prio=9 os_prio=0 tid=0x00007f20281d2800 nid=0x20b waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"Signal Dispatcher" #5 daemon prio=9 os_prio=0 tid=0x00007f20281d0800 nid=0x20a runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"Surrogate Locker Thread (Concurrent GC)" #4 daemon prio=9 os_prio=0 tid=0x00007f20281ce800 nid=0x208 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007f20281a1800 nid=0x1f4 in Object.wait() [0x00007f1fd3ffe000]
   java.lang.Thread.State: WAITING (on object monitor)
 at java.lang.Object.wait(Native Method)
 - waiting on <0x00000000803fb7e0> (a java.lang.ref.ReferenceQueue$Lock)
 at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:142)
 - locked <0x00000000803fb7e0> (a java.lang.ref.ReferenceQueue$Lock)
 at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:158)
 at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)


"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007f202819f800 nid=0x1f3 in Object.wait() [0x00007f1fd81ce000]
   java.lang.Thread.State: WAITING (on object monitor)
 at java.lang.Object.wait(Native Method)
 - waiting on <0x00000000803fb820> (a java.lang.ref.Reference$Lock)
 at java.lang.Object.wait(Object.java:502)
 at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157)
 - locked <0x00000000803fb820> (a java.lang.ref.Reference$Lock)


"main" #1 prio=5 os_prio=0 tid=0x00007f202800f800 nid=0x18e waiting on condition [0x00007f202f6d3000]
   java.lang.Thread.State: WAITING (parking)
 at sun.misc.Unsafe.park(Native Method)
 - parking to wait for  <0x0000000082701090> (a java.util.concurrent.FutureTask)
 at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
 at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:429)
 at java.util.concurrent.FutureTask.get(FutureTask.java:191)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.runInCompilerThread(Compiler.java:719)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.compile(Compiler.java:652)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.compileModules(Compiler.java:643)
 at com.google.gwt.dev.js.ClosureJsRunner.compile(ClosureJsRunner.java:197)
 at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$PermutationCompiler.generateJavaScriptCode(JavaToJavaScriptCompiler.java:524)
 at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$PermutationCompiler.compilePermutation(JavaToJavaScriptCompiler.java:347)
 at com.google.gwt.dev.jjs.MonolithicJavaToJavaScriptCompiler.compilePermutation(MonolithicJavaToJavaScriptCompiler.java:296)
 at com.google.gwt.dev.jjs.UnifiedAst.compilePermutation(UnifiedAst.java:143)
 at com.google.gwt.dev.CompilePerms.compile(CompilePerms.java:197)
 at com.google.gwt.dev.CompilePermsServer.compilePermutation(CompilePermsServer.java:319)
 at com.google.gwt.dev.CompilePermsServer.run(CompilePermsServer.java:283)
 at com.google.gwt.dev.CompilePermsServer.main(CompilePermsServer.java:246)


"VM Thread" os_prio=0 tid=0x00007f2028198800 nid=0x1ec runnable


"Gang worker#0 (Parallel GC Threads)" os_prio=0 tid=0x00007f2028024000 nid=0x1b4 runnable


"Gang worker#1 (Parallel GC Threads)" os_prio=0 tid=0x00007f2028026000 nid=0x1b7 runnable


"Gang worker#2 (Parallel GC Threads)" os_prio=0 tid=0x00007f2028027800 nid=0x1ba runnable


"Gang worker#3 (Parallel GC Threads)" os_prio=0 tid=0x00007f2028029800 nid=0x1bb runnable


"Gang worker#4 (Parallel GC Threads)" os_prio=0 tid=0x00007f202802b000 nid=0x1bc runnable


"Gang worker#5 (Parallel GC Threads)" os_prio=0 tid=0x00007f202802d000 nid=0x1bd runnable


"Gang worker#6 (Parallel GC Threads)" os_prio=0 tid=0x00007f202802e800 nid=0x1be runnable


"Gang worker#7 (Parallel GC Threads)" os_prio=0 tid=0x00007f2028030000 nid=0x1bf runnable


"G1 Main Concurrent Mark GC Thread" os_prio=0 tid=0x00007f202804a000 nid=0x1e0 runnable


"Gang worker#0 (G1 Parallel Marking Threads)" os_prio=0 tid=0x00007f202804c000 nid=0x1e1 runnable


"Gang worker#1 (G1 Parallel Marking Threads)" os_prio=0 tid=0x00007f202804d800 nid=0x1e5 runnable


"G1 Concurrent Refinement Thread#0" os_prio=0 tid=0x00007f2028041000 nid=0x1d9 runnable


"G1 Concurrent Refinement Thread#1" os_prio=0 tid=0x00007f202803f800 nid=0x1d6 runnable


"G1 Concurrent Refinement Thread#2" os_prio=0 tid=0x00007f202803d800 nid=0x1d3 runnable


"G1 Concurrent Refinement Thread#3" os_prio=0 tid=0x00007f202803c000 nid=0x1d1 runnable


"G1 Concurrent Refinement Thread#4" os_prio=0 tid=0x00007f202803a000 nid=0x1cf runnable


"G1 Concurrent Refinement Thread#5" os_prio=0 tid=0x00007f2028038800 nid=0x1cd runnable


"G1 Concurrent Refinement Thread#6" os_prio=0 tid=0x00007f2028036800 nid=0x1cb runnable


"G1 Concurrent Refinement Thread#7" os_prio=0 tid=0x00007f2028035000 nid=0x1c9 runnable


"G1 Concurrent Refinement Thread#8" os_prio=0 tid=0x00007f2028033000 nid=0x1c5 runnable


"VM Periodic Task Thread" os_prio=0 tid=0x00007f20281fc000 nid=0x21c waiting on condition


JNI global references: 150

This is a c3.2xlarge machine in AWS EC2.

There are 3 other GWT compiler processes, each of them looks like this:

2015-01-05 12:52:03
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode):


"Attach Listener" #14 daemon prio=9 os_prio=0 tid=0x00007f1fa0001000 nid=0x536c waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"jscompiler" #13 prio=5 os_prio=0 tid=0x00007f20289f4000 nid=0x22c runnable [0x00007f1fc1ffd000]
   java.lang.Thread.State: RUNNABLE
 at com.google.gwt.thirdparty.guava.common.collect.AbstractMultimap.keySet(AbstractMultimap.java:150)
 at com.google.gwt.thirdparty.guava.common.collect.HashMultimap.keySet(HashMultimap.java:49)
 at com.google.gwt.thirdparty.guava.common.collect.HashMultimap.<init>(HashMultimap.java:101)
 at com.google.gwt.thirdparty.guava.common.collect.HashMultimap.create(HashMultimap.java:87)
 at com.google.gwt.thirdparty.javascript.jscomp.MaybeReachingVariableUse$ReachingUses.<init>(MaybeReachingVariableUse.java:98)
 at com.google.gwt.thirdparty.javascript.jscomp.MaybeReachingVariableUse.flowThrough(MaybeReachingVariableUse.java:148)
 at com.google.gwt.thirdparty.javascript.jscomp.MaybeReachingVariableUse.flowThrough(MaybeReachingVariableUse.java:44)
 at com.google.gwt.thirdparty.javascript.jscomp.DataFlowAnalysis.flow(DataFlowAnalysis.java:275)
 at com.google.gwt.thirdparty.javascript.jscomp.DataFlowAnalysis.analyze(DataFlowAnalysis.java:212)
 at com.google.gwt.thirdparty.javascript.jscomp.DataFlowAnalysis.analyze(DataFlowAnalysis.java:180)
 at com.google.gwt.thirdparty.javascript.jscomp.FlowSensitiveInlineVariables.enterScope(FlowSensitiveInlineVariables.java:151)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.pushScope(NodeTraversal.java:600)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseFunction(NodeTraversal.java:558)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:528)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:534)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:534)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:534)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseBranch(NodeTraversal.java:534)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseRoots(NodeTraversal.java:314)
 at com.google.gwt.thirdparty.javascript.jscomp.NodeTraversal.traverseRoots(NodeTraversal.java:295)
 at com.google.gwt.thirdparty.javascript.jscomp.FlowSensitiveInlineVariables.process(FlowSensitiveInlineVariables.java:175)
 at com.google.gwt.thirdparty.javascript.jscomp.PhaseOptimizer$NamedPass.process(PhaseOptimizer.java:271)
 at com.google.gwt.thirdparty.javascript.jscomp.PhaseOptimizer.process(PhaseOptimizer.java:215)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.optimize(Compiler.java:1945)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.compileInternal(Compiler.java:774)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.access$000(Compiler.java:86)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler$2.call(Compiler.java:655)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler$2.call(Compiler.java:652)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler$3.call(Compiler.java:699)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)


"Service Thread" #10 daemon prio=9 os_prio=0 tid=0x00007f20281f8800 nid=0x21b runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C1 CompilerThread3" #9 daemon prio=9 os_prio=0 tid=0x00007f20281db800 nid=0x20e waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C2 CompilerThread2" #8 daemon prio=9 os_prio=0 tid=0x00007f20281d7000 nid=0x20d waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C2 CompilerThread1" #7 daemon prio=9 os_prio=0 tid=0x00007f20281d5000 nid=0x20c waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"C2 CompilerThread0" #6 daemon prio=9 os_prio=0 tid=0x00007f20281d2800 nid=0x20b waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"Signal Dispatcher" #5 daemon prio=9 os_prio=0 tid=0x00007f20281d0800 nid=0x20a runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"Surrogate Locker Thread (Concurrent GC)" #4 daemon prio=9 os_prio=0 tid=0x00007f20281ce800 nid=0x208 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE


"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007f20281a1800 nid=0x1f4 in Object.wait() [0x00007f1fd3ffe000]
   java.lang.Thread.State: WAITING (on object monitor)
 at java.lang.Object.wait(Native Method)
 - waiting on <0x00000000803fb7e0> (a java.lang.ref.ReferenceQueue$Lock)
 at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:142)
 - locked <0x00000000803fb7e0> (a java.lang.ref.ReferenceQueue$Lock)
 at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:158)
 at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)


"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007f202819f800 nid=0x1f3 in Object.wait() [0x00007f1fd81ce000]
   java.lang.Thread.State: WAITING (on object monitor)
 at java.lang.Object.wait(Native Method)
 - waiting on <0x00000000803fb820> (a java.lang.ref.Reference$Lock)
 at java.lang.Object.wait(Object.java:502)
 at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157)
 - locked <0x00000000803fb820> (a java.lang.ref.Reference$Lock)


"main" #1 prio=5 os_prio=0 tid=0x00007f202800f800 nid=0x18e waiting on condition [0x00007f202f6d3000]
   java.lang.Thread.State: WAITING (parking)
 at sun.misc.Unsafe.park(Native Method)
 - parking to wait for  <0x0000000082701090> (a java.util.concurrent.FutureTask)
 at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
 at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:429)
 at java.util.concurrent.FutureTask.get(FutureTask.java:191)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.runInCompilerThread(Compiler.java:719)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.compile(Compiler.java:652)
 at com.google.gwt.thirdparty.javascript.jscomp.Compiler.compileModules(Compiler.java:643)
 at com.google.gwt.dev.js.ClosureJsRunner.compile(ClosureJsRunner.java:197)
 at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$PermutationCompiler.generateJavaScriptCode(JavaToJavaScriptCompiler.java:524)
 at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$PermutationCompiler.compilePermutation(JavaToJavaScriptCompiler.java:347)
 at com.google.gwt.dev.jjs.MonolithicJavaToJavaScriptCompiler.compilePermutation(MonolithicJavaToJavaScriptCompiler.java:296)
 at com.google.gwt.dev.jjs.UnifiedAst.compilePermutation(UnifiedAst.java:143)
 at com.google.gwt.dev.CompilePerms.compile(CompilePerms.java:197)
 at com.google.gwt.dev.CompilePermsServer.compilePermutation(CompilePermsServer.java:319)
 at com.google.gwt.dev.CompilePermsServer.run(CompilePermsServer.java:283)
 at com.google.gwt.dev.CompilePermsServer.main(CompilePermsServer.java:246)


"VM Thread" os_prio=0 tid=0x00007f2028198800 nid=0x1ec runnable


"Gang worker#0 (Parallel GC Threads)" os_prio=0 tid=0x00007f2028024000 nid=0x1b4 runnable


"Gang worker#1 (Parallel GC Threads)" os_prio=0 tid=0x00007f2028026000 nid=0x1b7 runnable


"Gang worker#2 (Parallel GC Threads)" os_prio=0 tid=0x00007f2028027800 nid=0x1ba runnable


"Gang worker#3 (Parallel GC Threads)" os_prio=0 tid=0x00007f2028029800 nid=0x1bb runnable


"Gang worker#4 (Parallel GC Threads)" os_prio=0 tid=0x00007f202802b000 nid=0x1bc runnable


"Gang worker#5 (Parallel GC Threads)" os_prio=0 tid=0x00007f202802d000 nid=0x1bd runnable


"Gang worker#6 (Parallel GC Threads)" os_prio=0 tid=0x00007f202802e800 nid=0x1be runnable


"Gang worker#7 (Parallel GC Threads)" os_prio=0 tid=0x00007f2028030000 nid=0x1bf runnable


"G1 Main Concurrent Mark GC Thread" os_prio=0 tid=0x00007f202804a000 nid=0x1e0 runnable


"Gang worker#0 (G1 Parallel Marking Threads)" os_prio=0 tid=0x00007f202804c000 nid=0x1e1 runnable


"Gang worker#1 (G1 Parallel Marking Threads)" os_prio=0 tid=0x00007f202804d800 nid=0x1e5 runnable


"G1 Concurrent Refinement Thread#0" os_prio=0 tid=0x00007f2028041000 nid=0x1d9 runnable


"G1 Concurrent Refinement Thread#1" os_prio=0 tid=0x00007f202803f800 nid=0x1d6 runnable


"G1 Concurrent Refinement Thread#2" os_prio=0 tid=0x00007f202803d800 nid=0x1d3 runnable


"G1 Concurrent Refinement Thread#3" os_prio=0 tid=0x00007f202803c000 nid=0x1d1 runnable


"G1 Concurrent Refinement Thread#4" os_prio=0 tid=0x00007f202803a000 nid=0x1cf runnable


"G1 Concurrent Refinement Thread#5" os_prio=0 tid=0x00007f2028038800 nid=0x1cd runnable


"G1 Concurrent Refinement Thread#6" os_prio=0 tid=0x00007f2028036800 nid=0x1cb runnable


"G1 Concurrent Refinement Thread#7" os_prio=0 tid=0x00007f2028035000 nid=0x1c9 runnable


"G1 Concurrent Refinement Thread#8" os_prio=0 tid=0x00007f2028033000 nid=0x1c5 runnable


"VM Periodic Task Thread" os_prio=0 tid=0x00007f20281fc000 nid=0x21c waiting on condition


JNI global references: 150

I've no idea whether this is reproducible, or how. Killing the stuck process manually makes the compilation continue, with some entries in the logs:

05-Jan-2015 14:09:11	[INFO] java.io.EOFException
05-Jan-2015 14:09:11	[INFO]         at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2601)
05-Jan-2015 14:09:11	[INFO]         at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1319)
05-Jan-2015 14:09:11	[INFO]         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
05-Jan-2015 14:09:11	[INFO]         at com.google.gwt.dev.ExternalPermutationWorkerFactory$ExternalPermutationWorker.compile(ExternalPermutationWorkerFactory.java:154)
05-Jan-2015 14:09:11	[INFO]         at com.google.gwt.dev.PermutationWorkerFactory$Manager$WorkerThread.run(PermutationWorkerFactory.java:74)
05-Jan-2015 14:09:11	[INFO]         at java.lang.Thread.run(Thread.java:745)

Regards,

--

Andreas

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