[jira] Created: (RVM-589) Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix

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[jira] Created: (RVM-589) Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix

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Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix
-------------------------------------------------------------------

                 Key: RVM-589
                 URL: http://jira.codehaus.org/browse/RVM-589
             Project: RVM
          Issue Type: Bug
          Components: Instruction Architecture: PowerPC, Operating System: AIX, Runtime: JNI
            Reporter: David Grove
             Fix For: 3.0


This is the most common failure on both ppc32-aix and ppc64-aix.  It seems to impact about 1 test every other run (ie, about 0.5 tests on average).

===== DaCapo xalan starting =====
WARNING: attempt to get compiled method #0
JikesRVM: internal error: recursive use of hardware exception registers (exiting)

-- Stack --
   at [0x4169dba4] Lorg/jikesrvm/runtime/RuntimeEntrypoints; deliverHardwareException(II)V at line 718
   at [0x4169dc04] <hardware trap>
   at [0x4169dc10] Lorg/jikesrvm/jni/JNIFunctions; GetStringUTFChars(Lorg/jikesrvm/jni/JNIEnvironment;ILorg/vmmagic/unboxed/Address;)Lorg/vmmagic/unboxed/Address; at line 3981
   at [0x4169dc60] <invisible method>
   at [0x4169dcc8] <native frame>
   at [0x4169dd08] <native frame>
   at [0x4169dd90] Lgnu/java/nio/VMChannel; open(Ljava/lang/String;I)I
   at [0x4169de38] Lgnu/java/nio/VMChannel; openFile(Ljava/lang/String;I)V at line 732
   at [0x4169de70] Lgnu/java/nio/FileChannelImpl; <init>(Ljava/io/File;I)V at line 151
   at [0x4169deb0] Lgnu/java/nio/FileChannelImpl; create(Ljava/io/File;I)Lgnu/java/nio/FileChannelImpl; at line 141
   at [0x4169dee0] Ljava/io/FileOutputStream; <init>(Ljava/io/File;Z)V at line 164
   at [0x4169df28] Ljava/io/FileOutputStream; <init>(Ljava/io/File;)V at line 129
   at [0x4169df50] Ldacapo/xalan/XalanHarness$XalanWorker; run()V at line 80
   at [0x4169dfb0] Lorg/jikesrvm/scheduler/RVMThread; run()V at line 595
   at [0x4169dfe8] Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 620

One instance is: http://jikesrvm.anu.edu.au/cattrack/results/piccolo.watson.ibm.com/core-ppc32/4370/prototype/default/dacapo/xalan

I suspect a problem is that if a GC happens at this program point we're making a mistake when interpreting the stackframes, but it's possible that there is some other problem (or that this is an indirect crash caused by the current known problems of Identity HashMaps in the bootimage).


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[jira] Assigned: (RVM-589) Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix

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     [ http://jira.codehaus.org/browse/RVM-589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Grove reassigned RVM-589:
-------------------------------

    Assignee: David Grove

> Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix
> -------------------------------------------------------------------
>
>                 Key: RVM-589
>                 URL: http://jira.codehaus.org/browse/RVM-589
>             Project: RVM
>          Issue Type: Bug
>          Components: Instruction Architecture: PowerPC, Operating System: AIX, Runtime: JNI
>            Reporter: David Grove
>            Assignee: David Grove
>             Fix For: 3.0
>
>
> This is the most common failure on both ppc32-aix and ppc64-aix.  It seems to impact about 1 test every other run (ie, about 0.5 tests on average).
> ===== DaCapo xalan starting =====
> WARNING: attempt to get compiled method #0
> JikesRVM: internal error: recursive use of hardware exception registers (exiting)
> -- Stack --
>    at [0x4169dba4] Lorg/jikesrvm/runtime/RuntimeEntrypoints; deliverHardwareException(II)V at line 718
>    at [0x4169dc04] <hardware trap>
>    at [0x4169dc10] Lorg/jikesrvm/jni/JNIFunctions; GetStringUTFChars(Lorg/jikesrvm/jni/JNIEnvironment;ILorg/vmmagic/unboxed/Address;)Lorg/vmmagic/unboxed/Address; at line 3981
>    at [0x4169dc60] <invisible method>
>    at [0x4169dcc8] <native frame>
>    at [0x4169dd08] <native frame>
>    at [0x4169dd90] Lgnu/java/nio/VMChannel; open(Ljava/lang/String;I)I
>    at [0x4169de38] Lgnu/java/nio/VMChannel; openFile(Ljava/lang/String;I)V at line 732
>    at [0x4169de70] Lgnu/java/nio/FileChannelImpl; <init>(Ljava/io/File;I)V at line 151
>    at [0x4169deb0] Lgnu/java/nio/FileChannelImpl; create(Ljava/io/File;I)Lgnu/java/nio/FileChannelImpl; at line 141
>    at [0x4169dee0] Ljava/io/FileOutputStream; <init>(Ljava/io/File;Z)V at line 164
>    at [0x4169df28] Ljava/io/FileOutputStream; <init>(Ljava/io/File;)V at line 129
>    at [0x4169df50] Ldacapo/xalan/XalanHarness$XalanWorker; run()V at line 80
>    at [0x4169dfb0] Lorg/jikesrvm/scheduler/RVMThread; run()V at line 595
>    at [0x4169dfe8] Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 620
> One instance is: http://jikesrvm.anu.edu.au/cattrack/results/piccolo.watson.ibm.com/core-ppc32/4370/prototype/default/dacapo/xalan
> I suspect a problem is that if a GC happens at this program point we're making a mistake when interpreting the stackframes, but it's possible that there is some other problem (or that this is an indirect crash caused by the current known problems of Identity HashMaps in the bootimage).

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[jira] Updated: (RVM-589) Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix

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     [ http://jira.codehaus.org/browse/RVM-589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Grove updated RVM-589:
----------------------------

    Fix Version/s:     (was: 3.0)
                   3.0.1

> Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix
> -------------------------------------------------------------------
>
>                 Key: RVM-589
>                 URL: http://jira.codehaus.org/browse/RVM-589
>             Project: RVM
>          Issue Type: Bug
>          Components: Instruction Architecture: PowerPC, Operating System: AIX, Runtime: JNI
>            Reporter: David Grove
>            Assignee: David Grove
>             Fix For: 3.0.1
>
>
> This is the most common failure on both ppc32-aix and ppc64-aix.  It seems to impact about 1 test every other run (ie, about 0.5 tests on average).
> ===== DaCapo xalan starting =====
> WARNING: attempt to get compiled method #0
> JikesRVM: internal error: recursive use of hardware exception registers (exiting)
> -- Stack --
>    at [0x4169dba4] Lorg/jikesrvm/runtime/RuntimeEntrypoints; deliverHardwareException(II)V at line 718
>    at [0x4169dc04] <hardware trap>
>    at [0x4169dc10] Lorg/jikesrvm/jni/JNIFunctions; GetStringUTFChars(Lorg/jikesrvm/jni/JNIEnvironment;ILorg/vmmagic/unboxed/Address;)Lorg/vmmagic/unboxed/Address; at line 3981
>    at [0x4169dc60] <invisible method>
>    at [0x4169dcc8] <native frame>
>    at [0x4169dd08] <native frame>
>    at [0x4169dd90] Lgnu/java/nio/VMChannel; open(Ljava/lang/String;I)I
>    at [0x4169de38] Lgnu/java/nio/VMChannel; openFile(Ljava/lang/String;I)V at line 732
>    at [0x4169de70] Lgnu/java/nio/FileChannelImpl; <init>(Ljava/io/File;I)V at line 151
>    at [0x4169deb0] Lgnu/java/nio/FileChannelImpl; create(Ljava/io/File;I)Lgnu/java/nio/FileChannelImpl; at line 141
>    at [0x4169dee0] Ljava/io/FileOutputStream; <init>(Ljava/io/File;Z)V at line 164
>    at [0x4169df28] Ljava/io/FileOutputStream; <init>(Ljava/io/File;)V at line 129
>    at [0x4169df50] Ldacapo/xalan/XalanHarness$XalanWorker; run()V at line 80
>    at [0x4169dfb0] Lorg/jikesrvm/scheduler/RVMThread; run()V at line 595
>    at [0x4169dfe8] Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 620
> One instance is: http://jikesrvm.anu.edu.au/cattrack/results/piccolo.watson.ibm.com/core-ppc32/4370/prototype/default/dacapo/xalan
> I suspect a problem is that if a GC happens at this program point we're making a mistake when interpreting the stackframes, but it's possible that there is some other problem (or that this is an indirect crash caused by the current known problems of Identity HashMaps in the bootimage).

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[jira] Commented: (RVM-589) Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix

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    [ http://jira.codehaus.org/browse/RVM-589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=148210#action_148210 ]

David Grove commented on RVM-589:
---------------------------------

happened on mtrt last night:  http://jikesrvm.anu.edu.au/cattrack/results/piano.watson.ibm.com/core-ppc32/5315/production/default/SPECjvm98/_227_mtrt/default/Output.txt

> Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix
> -------------------------------------------------------------------
>
>                 Key: RVM-589
>                 URL: http://jira.codehaus.org/browse/RVM-589
>             Project: RVM
>          Issue Type: Bug
>          Components: Instruction Architecture: PowerPC, Operating System: AIX, Runtime: JNI
>            Reporter: David Grove
>            Assignee: David Grove
>             Fix For: 3.0.1
>
>
> This is the most common failure on both ppc32-aix and ppc64-aix.  It seems to impact about 1 test every other run (ie, about 0.5 tests on average).
> ===== DaCapo xalan starting =====
> WARNING: attempt to get compiled method #0
> JikesRVM: internal error: recursive use of hardware exception registers (exiting)
> -- Stack --
>    at [0x4169dba4] Lorg/jikesrvm/runtime/RuntimeEntrypoints; deliverHardwareException(II)V at line 718
>    at [0x4169dc04] <hardware trap>
>    at [0x4169dc10] Lorg/jikesrvm/jni/JNIFunctions; GetStringUTFChars(Lorg/jikesrvm/jni/JNIEnvironment;ILorg/vmmagic/unboxed/Address;)Lorg/vmmagic/unboxed/Address; at line 3981
>    at [0x4169dc60] <invisible method>
>    at [0x4169dcc8] <native frame>
>    at [0x4169dd08] <native frame>
>    at [0x4169dd90] Lgnu/java/nio/VMChannel; open(Ljava/lang/String;I)I
>    at [0x4169de38] Lgnu/java/nio/VMChannel; openFile(Ljava/lang/String;I)V at line 732
>    at [0x4169de70] Lgnu/java/nio/FileChannelImpl; <init>(Ljava/io/File;I)V at line 151
>    at [0x4169deb0] Lgnu/java/nio/FileChannelImpl; create(Ljava/io/File;I)Lgnu/java/nio/FileChannelImpl; at line 141
>    at [0x4169dee0] Ljava/io/FileOutputStream; <init>(Ljava/io/File;Z)V at line 164
>    at [0x4169df28] Ljava/io/FileOutputStream; <init>(Ljava/io/File;)V at line 129
>    at [0x4169df50] Ldacapo/xalan/XalanHarness$XalanWorker; run()V at line 80
>    at [0x4169dfb0] Lorg/jikesrvm/scheduler/RVMThread; run()V at line 595
>    at [0x4169dfe8] Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 620
> One instance is: http://jikesrvm.anu.edu.au/cattrack/results/piccolo.watson.ibm.com/core-ppc32/4370/prototype/default/dacapo/xalan
> I suspect a problem is that if a GC happens at this program point we're making a mistake when interpreting the stackframes, but it's possible that there is some other problem (or that this is an indirect crash caused by the current known problems of Identity HashMaps in the bootimage).

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[jira] Updated: (RVM-589) Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix

by JIRA jira@codehaus.org :: Rate this Message:

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     [ http://jira.codehaus.org/browse/RVM-589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Grove updated RVM-589:
----------------------------

    Affects Version/s: 3.0.1
                       3.0
        Fix Version/s:     (was: 3.0.1)
                       3.0.2

> Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix
> -------------------------------------------------------------------
>
>                 Key: RVM-589
>                 URL: http://jira.codehaus.org/browse/RVM-589
>             Project: RVM
>          Issue Type: Bug
>          Components: Instruction Architecture: PowerPC, Operating System: AIX, Runtime: JNI
>    Affects Versions: 3.0, 3.0.1
>            Reporter: David Grove
>            Assignee: David Grove
>             Fix For: 3.0.2
>
>
> This is the most common failure on both ppc32-aix and ppc64-aix.  It seems to impact about 1 test every other run (ie, about 0.5 tests on average).
> ===== DaCapo xalan starting =====
> WARNING: attempt to get compiled method #0
> JikesRVM: internal error: recursive use of hardware exception registers (exiting)
> -- Stack --
>    at [0x4169dba4] Lorg/jikesrvm/runtime/RuntimeEntrypoints; deliverHardwareException(II)V at line 718
>    at [0x4169dc04] <hardware trap>
>    at [0x4169dc10] Lorg/jikesrvm/jni/JNIFunctions; GetStringUTFChars(Lorg/jikesrvm/jni/JNIEnvironment;ILorg/vmmagic/unboxed/Address;)Lorg/vmmagic/unboxed/Address; at line 3981
>    at [0x4169dc60] <invisible method>
>    at [0x4169dcc8] <native frame>
>    at [0x4169dd08] <native frame>
>    at [0x4169dd90] Lgnu/java/nio/VMChannel; open(Ljava/lang/String;I)I
>    at [0x4169de38] Lgnu/java/nio/VMChannel; openFile(Ljava/lang/String;I)V at line 732
>    at [0x4169de70] Lgnu/java/nio/FileChannelImpl; <init>(Ljava/io/File;I)V at line 151
>    at [0x4169deb0] Lgnu/java/nio/FileChannelImpl; create(Ljava/io/File;I)Lgnu/java/nio/FileChannelImpl; at line 141
>    at [0x4169dee0] Ljava/io/FileOutputStream; <init>(Ljava/io/File;Z)V at line 164
>    at [0x4169df28] Ljava/io/FileOutputStream; <init>(Ljava/io/File;)V at line 129
>    at [0x4169df50] Ldacapo/xalan/XalanHarness$XalanWorker; run()V at line 80
>    at [0x4169dfb0] Lorg/jikesrvm/scheduler/RVMThread; run()V at line 595
>    at [0x4169dfe8] Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 620
> One instance is: http://jikesrvm.anu.edu.au/cattrack/results/piccolo.watson.ibm.com/core-ppc32/4370/prototype/default/dacapo/xalan
> I suspect a problem is that if a GC happens at this program point we're making a mistake when interpreting the stackframes, but it's possible that there is some other problem (or that this is an indirect crash caused by the current known problems of Identity HashMaps in the bootimage).

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[jira] Commented: (RVM-589) Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix

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    [ http://jira.codehaus.org/browse/RVM-589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=168794#action_168794 ]

David Grove commented on RVM-589:
---------------------------------

Similar failure still happening on ppc32-linux:  http://jikesrvm.anu.edu.au/cattrack/results/piano.watson.ibm.com/core-ppc32/8208/prototype/default/dacapo/xalan

> Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix
> -------------------------------------------------------------------
>
>                 Key: RVM-589
>                 URL: http://jira.codehaus.org/browse/RVM-589
>             Project: RVM
>          Issue Type: Bug
>          Components: Instruction Architecture: PowerPC, Operating System: AIX, Runtime: JNI
>    Affects Versions: 3.0, 3.0.1
>            Reporter: David Grove
>            Assignee: David Grove
>             Fix For: 3.1.0
>
>
> This is the most common failure on both ppc32-aix and ppc64-aix.  It seems to impact about 1 test every other run (ie, about 0.5 tests on average).
> ===== DaCapo xalan starting =====
> WARNING: attempt to get compiled method #0
> JikesRVM: internal error: recursive use of hardware exception registers (exiting)
> -- Stack --
>    at [0x4169dba4] Lorg/jikesrvm/runtime/RuntimeEntrypoints; deliverHardwareException(II)V at line 718
>    at [0x4169dc04] <hardware trap>
>    at [0x4169dc10] Lorg/jikesrvm/jni/JNIFunctions; GetStringUTFChars(Lorg/jikesrvm/jni/JNIEnvironment;ILorg/vmmagic/unboxed/Address;)Lorg/vmmagic/unboxed/Address; at line 3981
>    at [0x4169dc60] <invisible method>
>    at [0x4169dcc8] <native frame>
>    at [0x4169dd08] <native frame>
>    at [0x4169dd90] Lgnu/java/nio/VMChannel; open(Ljava/lang/String;I)I
>    at [0x4169de38] Lgnu/java/nio/VMChannel; openFile(Ljava/lang/String;I)V at line 732
>    at [0x4169de70] Lgnu/java/nio/FileChannelImpl; <init>(Ljava/io/File;I)V at line 151
>    at [0x4169deb0] Lgnu/java/nio/FileChannelImpl; create(Ljava/io/File;I)Lgnu/java/nio/FileChannelImpl; at line 141
>    at [0x4169dee0] Ljava/io/FileOutputStream; <init>(Ljava/io/File;Z)V at line 164
>    at [0x4169df28] Ljava/io/FileOutputStream; <init>(Ljava/io/File;)V at line 129
>    at [0x4169df50] Ldacapo/xalan/XalanHarness$XalanWorker; run()V at line 80
>    at [0x4169dfb0] Lorg/jikesrvm/scheduler/RVMThread; run()V at line 595
>    at [0x4169dfe8] Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 620
> One instance is: http://jikesrvm.anu.edu.au/cattrack/results/piccolo.watson.ibm.com/core-ppc32/4370/prototype/default/dacapo/xalan
> I suspect a problem is that if a GC happens at this program point we're making a mistake when interpreting the stackframes, but it's possible that there is some other problem (or that this is an indirect crash caused by the current known problems of Identity HashMaps in the bootimage).

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[jira] Assigned: (RVM-589) Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix

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     [ http://jira.codehaus.org/browse/RVM-589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Grove reassigned RVM-589:
-------------------------------

    Assignee: Daniel Frampton  (was: David Grove)

It appears this was yet another symptom of the problems in the reflection code that Daniel fixed a while back.


> Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix
> -------------------------------------------------------------------
>
>                 Key: RVM-589
>                 URL: http://jira.codehaus.org/browse/RVM-589
>             Project: RVM
>          Issue Type: Bug
>          Components: Instruction Architecture: PowerPC, Operating System: AIX, Runtime: JNI
>    Affects Versions: 3.0, 3.0.1
>            Reporter: David Grove
>            Assignee: Daniel Frampton
>             Fix For: 3.1.0
>
>
> This is the most common failure on both ppc32-aix and ppc64-aix.  It seems to impact about 1 test every other run (ie, about 0.5 tests on average).
> ===== DaCapo xalan starting =====
> WARNING: attempt to get compiled method #0
> JikesRVM: internal error: recursive use of hardware exception registers (exiting)
> -- Stack --
>    at [0x4169dba4] Lorg/jikesrvm/runtime/RuntimeEntrypoints; deliverHardwareException(II)V at line 718
>    at [0x4169dc04] <hardware trap>
>    at [0x4169dc10] Lorg/jikesrvm/jni/JNIFunctions; GetStringUTFChars(Lorg/jikesrvm/jni/JNIEnvironment;ILorg/vmmagic/unboxed/Address;)Lorg/vmmagic/unboxed/Address; at line 3981
>    at [0x4169dc60] <invisible method>
>    at [0x4169dcc8] <native frame>
>    at [0x4169dd08] <native frame>
>    at [0x4169dd90] Lgnu/java/nio/VMChannel; open(Ljava/lang/String;I)I
>    at [0x4169de38] Lgnu/java/nio/VMChannel; openFile(Ljava/lang/String;I)V at line 732
>    at [0x4169de70] Lgnu/java/nio/FileChannelImpl; <init>(Ljava/io/File;I)V at line 151
>    at [0x4169deb0] Lgnu/java/nio/FileChannelImpl; create(Ljava/io/File;I)Lgnu/java/nio/FileChannelImpl; at line 141
>    at [0x4169dee0] Ljava/io/FileOutputStream; <init>(Ljava/io/File;Z)V at line 164
>    at [0x4169df28] Ljava/io/FileOutputStream; <init>(Ljava/io/File;)V at line 129
>    at [0x4169df50] Ldacapo/xalan/XalanHarness$XalanWorker; run()V at line 80
>    at [0x4169dfb0] Lorg/jikesrvm/scheduler/RVMThread; run()V at line 595
>    at [0x4169dfe8] Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 620
> One instance is: http://jikesrvm.anu.edu.au/cattrack/results/piccolo.watson.ibm.com/core-ppc32/4370/prototype/default/dacapo/xalan
> I suspect a problem is that if a GC happens at this program point we're making a mistake when interpreting the stackframes, but it's possible that there is some other problem (or that this is an indirect crash caused by the current known problems of Identity HashMaps in the bootimage).

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[jira] Closed: (RVM-589) Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix

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     [ http://jira.codehaus.org/browse/RVM-589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Grove closed RVM-589.
---------------------------

       Resolution: Fixed
    Fix Version/s:     (was: 3.1.1)
                   3.1.0

Actually was fixed a while ago and fix is in 3.1.0.


> Crash in GetStringUTFChars running xalan on ppc32-aix and ppc64-aix
> -------------------------------------------------------------------
>
>                 Key: RVM-589
>                 URL: http://jira.codehaus.org/browse/RVM-589
>             Project: RVM
>          Issue Type: Bug
>          Components: Instruction Architecture: PowerPC, Operating System: AIX, Runtime: JNI
>    Affects Versions: 3.0, 3.0.1
>            Reporter: David Grove
>            Assignee: Daniel Frampton
>             Fix For: 3.1.0
>
>
> This is the most common failure on both ppc32-aix and ppc64-aix.  It seems to impact about 1 test every other run (ie, about 0.5 tests on average).
> ===== DaCapo xalan starting =====
> WARNING: attempt to get compiled method #0
> JikesRVM: internal error: recursive use of hardware exception registers (exiting)
> -- Stack --
>    at [0x4169dba4] Lorg/jikesrvm/runtime/RuntimeEntrypoints; deliverHardwareException(II)V at line 718
>    at [0x4169dc04] <hardware trap>
>    at [0x4169dc10] Lorg/jikesrvm/jni/JNIFunctions; GetStringUTFChars(Lorg/jikesrvm/jni/JNIEnvironment;ILorg/vmmagic/unboxed/Address;)Lorg/vmmagic/unboxed/Address; at line 3981
>    at [0x4169dc60] <invisible method>
>    at [0x4169dcc8] <native frame>
>    at [0x4169dd08] <native frame>
>    at [0x4169dd90] Lgnu/java/nio/VMChannel; open(Ljava/lang/String;I)I
>    at [0x4169de38] Lgnu/java/nio/VMChannel; openFile(Ljava/lang/String;I)V at line 732
>    at [0x4169de70] Lgnu/java/nio/FileChannelImpl; <init>(Ljava/io/File;I)V at line 151
>    at [0x4169deb0] Lgnu/java/nio/FileChannelImpl; create(Ljava/io/File;I)Lgnu/java/nio/FileChannelImpl; at line 141
>    at [0x4169dee0] Ljava/io/FileOutputStream; <init>(Ljava/io/File;Z)V at line 164
>    at [0x4169df28] Ljava/io/FileOutputStream; <init>(Ljava/io/File;)V at line 129
>    at [0x4169df50] Ldacapo/xalan/XalanHarness$XalanWorker; run()V at line 80
>    at [0x4169dfb0] Lorg/jikesrvm/scheduler/RVMThread; run()V at line 595
>    at [0x4169dfe8] Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 620
> One instance is: http://jikesrvm.anu.edu.au/cattrack/results/piccolo.watson.ibm.com/core-ppc32/4370/prototype/default/dacapo/xalan
> I suspect a problem is that if a GC happens at this program point we're making a mistake when interpreting the stackframes, but it's possible that there is some other problem (or that this is an indirect crash caused by the current known problems of Identity HashMaps in the bootimage).

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