[Bug libgcj/16902] New: GIJ: Garbage collection fails with interpreter

[Bug libgcj/16902] New: GIJ: Garbage collection fails with interpreter

[mckinlay at redhat dot com]

Garbage collection stress tests fail when run under the interpreter. The actual
error varies, and is usually a bus error or a NullPointerException at random
places in the code. It appears that something is not being marked as it should.

Run the attached test case to reproduce.

The problems mentioned in this thread may be related:

http://gcc.gnu.org/ml/java/2004-07/msg00050.html
http://gcc.gnu.org/ml/java/2004-07/msg00062.html

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           Summary: GIJ: Garbage collection fails with interpreter
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libgcj
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mckinlay at redhat dot com
                CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
                    dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16902

[Bug libgcj/16902] GIJ: Garbage collection fails with interpreter

[mckinlay at redhat dot com]

------- Additional Comments From mckinlay at redhat dot com  2004-08-06 16:19 -------
Created an attachment (id=6894)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=6894&action=view)
Test case


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16902

[Bug libgcj/16902] GIJ: Garbage collection related failure with interpreter

[mckinlay at redhat dot com]

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           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|GIJ: Garbage collection     |GIJ: Garbage collection
                   |fails with interpreter      |related failure with
                   |                            |interpreter


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16902

[Bug libgcj/16902] GIJ: Garbage collection related failure with interpreter

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-10-02 04:26 -------
Confirmed.

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           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-10-02 04:26:35
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16902

[Bug libgcj/16902] GIJ: Garbage collection related failure with interpreter

[mckinlay at redhat dot com]

------- Comment #5 from mckinlay at redhat dot com  2006-02-06 18:41 -------
Another example of failure:

[5]:  Success
java.lang.NullPointerException
   at GCTest.testObjChain (GCTest.java:251)
   at GCTest.testObjArray (GCTest.java:191)
   at GCTest.run (GCTest.java:104)
   at java.lang.Thread.run (Thread.java:653)
[44]:  Failure: testObjArray: Caught exception: null
[44]:  Success
java.lang.NullPointerException
   at GCTest.testObjChain (GCTest.java:251)
   at GCTest.testObjArray (GCTest.java:191)
   at GCTest.run (GCTest.java:104)
   at java.lang.Thread.run (Thread.java:653)
[33]:  Failure: testObjArray: Caught exception: null
java.lang.NullPointerException
   at GCTest.testObjChain (GCTest.java:251)
   at GCTest.testObjArray (GCTest.java:191)
   at GCTest.run (GCTest.java:104)
   at java.lang.Thread.run (Thread.java:653)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16902

[Bug libgcj/16902] GIJ: Garbage collection related failure with interpreter

[mckinlay at redhat dot com]

------- Comment #4 from mckinlay at redhat dot com  2006-02-06 18:38 -------
You might need a multiprocessor or hyper-threaded machine to reproduce it. I
was able to reproduce it with HEAD just now:

$ while (true) do gij GCTest; done

....

[20]:  Success
java.lang.LinkageError: field type mismatch with different loaders
   at GCTest$GCTest_Object.<init> (GCTest.java:18)
   at GCTest.testObjChain (GCTest.java:245)
   at GCTest.run (GCTest.java:126)
   at java.lang.Thread.run (Thread.java:653)
Caused by: java.lang.NoClassDefFoundError: this$0
   at GCTest$GCTest_Object.<init> (GCTest.java:18)
   ...3 more
[41]:  Failure: testObjChain: Caught exception: field type mismatch with
different loaders


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16902

[Bug libgcj/16902] GIJ: Garbage collection related failure with interpreter

[tromey at gcc dot gnu dot org]

------- Comment #3 from tromey at gcc dot gnu dot org  2006-02-04 22:29 -------
I played with this a bit today and I'm not able to reproduce.
Do you need special arguments to the test program?
I tried with my current 4.0.x and 4.1 builds.


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tromey at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16902