RFR(S): 8131129: Attempt to define a duplicate BMH$Species class (original) (raw)

Michael Haupt michael.haupt at oracle.com
Wed Oct 28 09:19:14 UTC 2015

Dear all,

please review this change. Bug: https://bugs.openjdk.java.net/browse/JDK-8131129 Webrev: http://cr.openjdk.java.net/~mhaupt/8131129/webrev.00/

Thanks to Peter Levart, who has contributed the actual code to fix the issue.

The background of this is as follows. Bug 8131129 is an intermittent failure in a multi-threaded test for LambdaForm caching. The failure was not reproducible but used to occur on various platforms every now and then. I was able to dig up some stack traces that reveal the real cause in internal test logs. These traces finally confirmed a suspicion that both Peter and I had had but could, for lack of complete failure information, not pin down as the cause of the issue. (Most traces from failures of the test were only partial, as the test harness is selective about traces it logs.)

At the heart of the problem is an overflowing code cache for adapters in the VM. The test, dynamically generating considerable amounts of LambdaForm and BoundMethodHandle species classes, would eventually trigger this overflow. The place at which the problem would surface is this, in BoundMethodHandle.Factory.generateConcreteBMHClass():

Class<? extends BoundMethodHandle> bmhClass = //UNSAFE.defineAnonymousClass(BoundMethodHandle.class, classFile, null).asSubclass(BoundMethodHandle.class); UNSAFE.defineClass(className, classFile, 0, classFile.length, BoundMethodHandle.class.getClassLoader(), null) .asSubclass(BoundMethodHandle.class); UNSAFE.ensureClassInitialized(bmhClass);

The test would generate a BMH species with a given type signature via defineClass and immediately thereafter force initialisation of that class, in the course of which a SpeciesData instance is supposed to be created and entered in the BMH species cache. In case the VM's adapter code cache overflowed during this operation, the BMH species' class initialiser would not finish its execution properly, leading to a stale placeholder entry left behind in the cache. The presence of this very placeholder would trick the next request for a BMH species with the same type signature into believing the class needed to be defined, leading to the observed failure.

An exemplary stack trace is appended below.

Both Peter and I had come up with solutions, but I think Peter's is better as it gets rid of the somewhat intricate and semi-hidden cache registration call made from generated code. With Peter's fix, it's all visible in library code now.

Thanks,

Michael

java.lang.InternalError: java.lang.NoSuchMethodException: no such method: java.lang.invoke.MethodHandle.linkToStatic(Object,Object,int,Object,Object,Object,Object,Object,Object,Object,MemberName)Object/invokeStatic at java.lang.invoke.MethodHandleStatics.newInternalError(MethodHandleStatics.java:120) at java.lang.invoke.DirectMethodHandle.makePreparedLambdaForm(DirectMethodHandle.java:214) at java.lang.invoke.DirectMethodHandle.preparedLambdaForm(DirectMethodHandle.java:188) at java.lang.invoke.DirectMethodHandle.preparedLambdaForm(DirectMethodHandle.java:177) at java.lang.invoke.DirectMethodHandle.make(DirectMethodHandle.java:84) at java.lang.invoke.MethodHandles$Lookup.getDirectMethodCommon(MethodHandles.java:1655) at java.lang.invoke.MethodHandles$Lookup.getDirectMethod(MethodHandles.java:1600) at java.lang.invoke.MethodHandles$Lookup.findStatic(MethodHandles.java:777) at java.lang.invoke.BoundMethodHandle$Factory.makeCbmhCtor(BoundMethodHandle.java:817) at java.lang.invoke.BoundMethodHandle$Factory.makeCtors(BoundMethodHandle.java:772) at java.lang.invoke.BoundMethodHandle$SpeciesData.(BoundMethodHandle.java:347) at java.lang.invoke.BoundMethodHandle$SpeciesData.getForClass(BoundMethodHandle.java:411) at java.lang.invoke.BoundMethodHandle$Species_IL7.(Species_IL7) at sun.misc.Unsafe.ensureClassInitialized(Native Method) at java.lang.invoke.BoundMethodHandle$Factory.generateConcreteBMHClass(BoundMethodHandle.java:718) at java.lang.invoke.BoundMethodHandle$SpeciesData.get(BoundMethodHandle.java:401) at java.lang.invoke.BoundMethodHandle$SpeciesData.extendWith(BoundMethodHandle.java:388) at java.lang.invoke.LambdaFormEditor.newSpeciesData(LambdaFormEditor.java:363) at java.lang.invoke.LambdaFormEditor.makeArgumentCombinationForm(LambdaFormEditor.java:631) at java.lang.invoke.LambdaFormEditor.filterArgumentForm(LambdaFormEditor.java:612) at java.lang.invoke.MethodHandles.filterArgument(MethodHandles.java:2667) at java.lang.invoke.MethodHandles.filterArguments(MethodHandles.java:2654) at TestMethods$4.getMH(TestMethods.java:180) at TestMethods.getTestCaseMH(TestMethods.java:548) at LFMultiThreadCachingTest.lambda$doTest$0(LFMultiThreadCachingTest.java:80) at LFMultiThreadCachingTest$$Lambda$5/21979926.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NoSuchMethodException: no such method: java.lang.invoke.MethodHandle.linkToStatic(Object,Object,int,Object,Object,Object,Object,Object,Object,Object,MemberName)Object/invokeStatic at java.lang.invoke.MemberName.makeAccessException(MemberName.java:873) at java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:990) at java.lang.invoke.DirectMethodHandle.makePreparedLambdaForm(DirectMethodHandle.java:212) ... 25 more Caused by: java.lang.NoSuchMethodError: java.lang.invoke.MethodHandle.linkToStatic(Ljava/lang/Object;Ljava/lang/Object;ILjava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/invoke/MemberName;)Ljava/lang/Object; at java.lang.invoke.MethodHandleNatives.resolve(Native Method) at java.lang.invoke.MemberName$Factory.resolve(MemberName.java:962) at java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:987) ... 26 more Caused by: java.lang.VirtualMachineError: out of space in CodeCache for method handle intrinsic ... 29 more java.lang.LinkageError: loader (instance of ): attempted duplicate class definition for name: "java/lang/invoke/BoundMethodHandle$Species_IL7" at sun.misc.Unsafe.defineClass(Native Method) at java.lang.invoke.BoundMethodHandle$Factory.generateConcreteBMHClass(BoundMethodHandle.java:715) at java.lang.invoke.BoundMethodHandle$SpeciesData.get(BoundMethodHandle.java:401) at java.lang.invoke.BoundMethodHandle$SpeciesData.extendWith(BoundMethodHandle.java:388) at java.lang.invoke.LambdaFormEditor.newSpeciesData(LambdaFormEditor.java:363) at java.lang.invoke.LambdaFormEditor.makeArgumentCombinationForm(LambdaFormEditor.java:631) at java.lang.invoke.LambdaFormEditor.filterArgumentForm(LambdaFormEditor.java:612) at java.lang.invoke.MethodHandles.filterArgument(MethodHandles.java:2667) at java.lang.invoke.MethodHandles.filterArguments(MethodHandles.java:2654) at TestMethods$4.getMH(TestMethods.java:180) at TestMethods.getTestCaseMH(TestMethods.java:548) at LFMultiThreadCachingTest.lambda$doTest$0(LFMultiThreadCachingTest.java:80) at LFMultiThreadCachingTest$$Lambda$5/21979926.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) java.lang.LinkageError: loader (instance of ): attempted duplicate class definition for name: "java/lang/invoke/BoundMethodHandle$Species_IL7" at sun.misc.Unsafe.defineClass(Native Method) at java.lang.invoke.BoundMethodHandle$Factory.generateConcreteBMHClass(BoundMethodHandle.java:715) at java.lang.invoke.BoundMethodHandle$SpeciesData.get(BoundMethodHandle.java:401) at java.lang.invoke.BoundMethodHandle$SpeciesData.extendWith(BoundMethodHandle.java:388) at java.lang.invoke.LambdaFormEditor.newSpeciesData(LambdaFormEditor.java:363) at java.lang.invoke.LambdaFormEditor.makeArgumentCombinationForm(LambdaFormEditor.java:631) at java.lang.invoke.LambdaFormEditor.filterArgumentForm(LambdaFormEditor.java:612) at java.lang.invoke.MethodHandles.filterArgument(MethodHandles.java:2667) at java.lang.invoke.MethodHandles.filterArguments(MethodHandles.java:2654) at TestMethods$4.getMH(TestMethods.java:180) at TestMethods.getTestCaseMH(TestMethods.java:548) at LFMultiThreadCachingTest.lambda$doTest$0(LFMultiThreadCachingTest.java:80) at LFMultiThreadCachingTest$$Lambda$5/21979926.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) STATUS:Failed.STATUS:Failed.STATUS:Failed.main' threw exception: java.lang.LinkageError: loader (instance of <bootloader>): attempted duplicate class definition for name: "java/lang/invoke/BoundMethodHandle$Species_IL7" main' threw exception: java.lang.LinkageError: loader (instance of ): attempted duplicate class definition for name: "java/lang/invoke/BoundMethodHandle$Species_IL7" `main' threw exception: java.lang.InternalError: java.lang.NoSuchMethodException: no such method: java.lang.invoke.MethodHandle.linkToStatic(Object,Object,int,Object,Object,Object,Object,Object,Object,Object,MemberName)Object/invokeStatic java.lang.LinkageError: loader (instance of ): attempted duplicate class definition for name: "java/lang/invoke/BoundMethodHandle$Species_IL7" at sun.misc.Unsafe.defineClass(Native Method) at java.lang.invoke.BoundMethodHandle$Factory.generateConcreteBMHClass(BoundMethodHandle.java:715) at java.lang.invoke.BoundMethodHandle$SpeciesData.get(BoundMethodHandle.java:401)

--

<http://www.oracle.com/> Dr. Michael Haupt | Principal Member of Technical Staff Phone: +49 331 200 7277 | Fax: +49 331 200 7561 Oracle Java Platform Group | LangTools Team | Nashorn Oracle Deutschland B.V. & Co. KG, Schiffbauergasse 14 | 14467 Potsdam, Germany <http://www.oracle.com/commitment> Oracle is committed to developing practices and products that help protect the environment

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