Re: [rvm-research] [rvm-core] Regarding Exception thrown in RefCount Implementation.

Hi,

Thank you for your reply. I cannot figure out why this error pops up.

I am attaching the patch here that reproduced that error. The error that
produced is following:
Exception in thread "MainThread": JikesRVM: internal error: recursive use
of hardware exception registers (exiting)

-- Stack --
(0x67507c6c 1132)   at [0x67507c6c, 0x5b308f54] Ljava/nio/charset/Charset;
provider()Ljava/nio/charset/spi/CharsetProvider; at line 247
(0x67507c90 1130)   at [0x67507c90, 0x5b3090fc] Ljava/nio/charset/Charset;
charsetForName(Ljava/lang/String;)Ljava/nio/charset/Charset; at line 208
(0x67507cb0 1129)   at [0x67507cb0, 0x5b0274ef] Ljava/nio/charset/Charset;
forName(Ljava/lang/String;)Ljava/nio/charset/Charset; at line 188
(0x67507cdc 1396)   at [0x67507cdc, 0x5b089ebf] Ljava/lang/String;
getBytes(Ljava/lang/String;)[B at line 733
(0x67507d0c 11899)   at [0x67507d0c, 0x5b08a174] Ljava/io/PrintStream;
writeChars(Ljava/lang/String;II)V at line 342
(0x67507d3c 11896)   at [0x67507d3c, 0x5b089b26] Ljava/io/PrintStream;
print(Ljava/lang/String;Z)V at line 295
(0x67507d64 11906)   at [0x67507d64, 0x5b0c04c3] Ljava/io/PrintStream;
print(Ljava/lang/String;)V at line 422
(0x67507d88 156)   at [0x67507d88, 0x5b0c052c] Ljava/lang/Throwable;
printStackTrace(Ljava/io/PrintStream;)V at line 363
(0x67507da8 155)   at [0x67507da8, 0x5b1d8686] Ljava/lang/Throwable;
printStackTrace()V at line 352
(0x67507dc8 13080)   at [0x67507dc8, 0x5b339a47]
Lorg/jikesrvm/scheduler/RVMThread;
handleUncaughtException(Ljava/lang/Throwable;)V at line 4723
(0x67507de8 8645)   at [0x67507de8, 0x5b339ce0]
Lorg/jikesrvm/runtime/RuntimeEntrypoints;
handleUncaughtException(Ljava/lang/Throwable;)V at line 1071
(0x67507e34 8644)   at [0x67507e34, 0x5b33ab25]
Lorg/jikesrvm/runtime/RuntimeEntrypoints;
deliverException(Ljava/lang/Throwable;Lorg/jikesrvm/ArchitectureSpecific$Registers;)V
at line 1066
(0x67507e74 8632)   at [0x67507e74, 0x5b2c7f0c]
Lorg/jikesrvm/runtime/RuntimeEntrypoints; deliverHardwareException(II)V at
line 796
(0x67507e90 1)   at [0x67507e90, 0x5b2c7f0c] <hardware trap>
(0x6753af70 4857)   at [0x6753af70, 0x5b2cd788]
Ljava/security/VMAccessController; popContext()V at line 135
(0x6753af90 4436)   at [0x6753af90, 0x5b1dceb9]
Ljava/security/AccessController;
doPrivileged(Ljava/security/PrivilegedAction;)Ljava/lang/Object; at line 100
(0x6753afb0 13031)   at [0x6753afb0, 0x5b1dd152]
Lorg/jikesrvm/scheduler/RVMThread; callSystemExit(I)V at line 2786
(0x6753afdc 13030)   at [0x6753afdc, 0x5b33152f]
Lorg/jikesrvm/scheduler/RVMThread; terminate()V at line 2754
(0x6753affc 13115)   at [0x6753affc, 0x08050376]
Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 2631

In thread 7 getInstructionOffset: ip is not within compiled code for
method: 0x00000000
supposed method is Lgnu/classpath/SystemProperties;.getProperty
(Ljava/lang/String;)Ljava/lang/String;
code for this method starts at 0x5b26e980
 and has last valid return address of 0x5b26e9dc
The requested instruction address was 0x00000000
JikesRVM: internal error: recursive use of hardware exception registers
(exiting)


On Wed, Dec 18, 2013 at 5:51 PM, Robin Garner <[email protected]>wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hari,
>
> Could you attach a patch containing the smallest change that
> reproduces this error ?  Perhaps then someone can help.
>
> cheers,
> Robin
>
> On 18/12/13 16:08, Hari Krishnan wrote:
> > Hi
> >
> > I have allocated a Header word along with 8 header bits in the
> > reference count garbage collector implementation. I didn't use that
> > header word allocated except it is allocated for each object. But
> > when I run the implementation I end up with exceptions. It would be
> > great help if someone summarizes the reason for this exception.
> > Exception in thread "MainThread": JikesRVM: internal error:
> > recursive use of hardware exception registers (exiting)
> >
> > -- Stack -- (0x67507c6c 1132)   at [0x67507c6c, 0x5b308f54]
> > Ljava/nio/charset/Charset;
> > provider()Ljava/nio/charset/spi/CharsetProvider; at line 247
> > (0x67507c90 1130)   at [0x67507c90, 0x5b3090fc]
> > Ljava/nio/charset/Charset;
> > charsetForName(Ljava/lang/String;)Ljava/nio/charset/Charset; at
> > line 208 (0x67507cb0 1129)   at [0x67507cb0, 0x5b0274ef]
> > Ljava/nio/charset/Charset;
> > forName(Ljava/lang/String;)Ljava/nio/charset/Charset; at line 188
> > (0x67507cdc 1396)   at [0x67507cdc, 0x5b089ebf] Ljava/lang/String;
> > getBytes(Ljava/lang/String;)[B at line 733 (0x67507d0c 11899)   at
> > [0x67507d0c, 0x5b08a174] Ljava/io/PrintStream;
> > writeChars(Ljava/lang/String;II)V at line 342 (0x67507d3c 11896)
> > at [0x67507d3c, 0x5b089b26] Ljava/io/PrintStream;
> > print(Ljava/lang/String;Z)V at line 295 (0x67507d64 11906)   at
> > [0x67507d64, 0x5b0c04c3] Ljava/io/PrintStream;
> > print(Ljava/lang/String;)V at line 422 (0x67507d88 156)   at
> > [0x67507d88, 0x5b0c052c] Ljava/lang/Throwable;
> > printStackTrace(Ljava/io/PrintStream;)V at line 363 (0x67507da8
> > 155)   at [0x67507da8, 0x5b1d8686] Ljava/lang/Throwable;
> > printStackTrace()V at line 352 (0x67507dc8 13080)   at [0x67507dc8,
> > 0x5b339a47] Lorg/jikesrvm/scheduler/RVMThread;
> > handleUncaughtException(Ljava/lang/Throwable;)V at line 4723
> > (0x67507de8 8645)   at [0x67507de8, 0x5b339ce0]
> > Lorg/jikesrvm/runtime/RuntimeEntrypoints;
> > handleUncaughtException(Ljava/lang/Throwable;)V at line 1071
> > (0x67507e34 8644)   at [0x67507e34, 0x5b33ab25]
> > Lorg/jikesrvm/runtime/RuntimeEntrypoints;
> >
> deliverException(Ljava/lang/Throwable;Lorg/jikesrvm/ArchitectureSpecific$Registers;)V
> >
> >
> at line 1066
> > (0x67507e74 8632)   at [0x67507e74, 0x5b2c7f0c]
> > Lorg/jikesrvm/runtime/RuntimeEntrypoints;
> > deliverHardwareException(II)V at line 796 (0x67507e90 1)   at
> > [0x67507e90, 0x5b2c7f0c] <hardware trap> (0x6753af70 4857)   at
> > [0x6753af70, 0x5b2cd788] Ljava/security/VMAccessController;
> > popContext()V at line 135 (0x6753af90 4436)   at [0x6753af90,
> > 0x5b1dceb9] Ljava/security/AccessController;
> > doPrivileged(Ljava/security/PrivilegedAction;)Ljava/lang/Object; at
> > line 100 (0x6753afb0 13031)   at [0x6753afb0, 0x5b1dd152]
> > Lorg/jikesrvm/scheduler/RVMThread; callSystemExit(I)V at line 2786
> > (0x6753afdc 13030)   at [0x6753afdc, 0x5b33152f]
> > Lorg/jikesrvm/scheduler/RVMThread; terminate()V at line 2754
> > (0x6753affc 13115)   at [0x6753affc, 0x08050376]
> > Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 2631
> >
> > In thread 7 getInstructionOffset: ip is not within compiled code
> > for method: 0x00000000 supposed method is
> > Lgnu/classpath/SystemProperties;.getProperty
> > (Ljava/lang/String;)Ljava/lang/String; code for this method starts
> > at 0x5b26e980 and has last valid return address of 0x5b26e9dc The
> > requested instruction address was 0x00000000 JikesRVM: internal
> > error: recursive use of hardware exception registers (exiting)
> >
> >
> > Cheers Hari Krishnan
> >
> >
> >
> ------------------------------------------------------------------------------
> >
> >
> Rapidly troubleshoot problems before they affect your business. Most IT
> > organizations don't have a clear picture of how application
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> >
> >
> >
> >
> > _______________________________________________ Jikesrvm-core
> > mailing list [email protected]
> > https://lists.sourceforge.net/lists/listinfo/jikesrvm-core
> >
>
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> ------------------------------------------------------------------------------
> Rapidly troubleshoot problems before they affect your business. Most IT
> organizations don't have a clear picture of how application performance
> affects their revenue. With AppDynamics, you get 100% visibility into your
> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics
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Index: MMTk/src/org/mmtk/plan/refcount/RCHeader.java
===================================================================
--- MMTk/src/org/mmtk/plan/refcount/RCHeader.java	(revision 3)
+++ MMTk/src/org/mmtk/plan/refcount/RCHeader.java	(working copy)
@@ -25,7 +25,7 @@
   /* Requirements */
   public static final int LOCAL_GC_BITS_REQUIRED = 0;
   public static final int GLOBAL_GC_BITS_REQUIRED = 8;
-  public static final int GC_HEADER_WORDS_REQUIRED = 0;
+  public static final int GC_HEADER_WORDS_REQUIRED = 2;
 
   /****************************************************************************
    * Object Logging (applies to *all* objects)