VM crash when running JTreg in agentvm mode

[Jonathan Lu]

Hello ppc-aix-port-dev,

As you may noticed from the commit notifications, recently I started to 
go through the JDK JTreg testing failures and trying to fix them. Here I 
met a VM crash problem when running JTreg in  agentvm mode, anybody have 
an idea about it?

Here comes the detail:

The problem was found when running JTreg test 
java/net/InetAddress/CheckJNI.java on AIX 64bit platform with OpenJDK 
Java7 build, if I pick the test case, compile it with javac and run it like

JDK_DIR/jre/bin/java -cp java/net/InetAddress/ CheckJNI

It will pass, but if using JTreg and specify '-agentvm' option, which 
means JTreg will create another VM to run the test case according to 
[1], it will just crash with following error,

    --------------------------------------------------------------------------------
    command: main -Xcheck:jni CheckJNI
    reason: User specified action: run main/othervm -Xcheck:jni CheckJNI
    elapsed time (seconds): 4.489
    STDOUT:
    #
    # A fatal error has been detected by the Java Runtime Environment:
    #
    #  Internal Error (os_aix.cpp:3514), pid=9765042, tid=6940
    #  Error: Unimplemented()
    #
    # JRE version: OpenJDK Runtime Environment (7.0) (build
    1.7.0-internal-debug-luchsh_2013_03_15_11_32-b00)
    # Java VM: OpenJDK 64-Bit Server VM (24.0-b34 mixed mode -ppc64
    compressed oops)
    # Core dump written. Default location:
    /home/luchsh/ppc7u/jdk/test/build/jtreg/work/scratch/core or
    core.9765042 (max size 1048575 kB). To ensure a full core dump, try
    "ulimit -c unlimited" before starting Java again
    #
    # An error report file with more information is saved as:
    #
    /home/luchsh/ppc7u/jdk/test/build/jtreg/work/scratch/hs_err_pid9765042.log
    #
    # If you would like to submit a bug report, please visit:
    #   http://bugreport.sun.com/bugreport/crash.jsp
    #
    STDERR:

    TEST RESULT: Failed. Unexpected exit from test [exit code: 134]
    --------------------------------------------------------------------------------

I've upload hs_err_pid9765042.log to [2], but the core dump is too big, 
if you cannot reproduce it I may try to find a place to upload the core 
dump file.

I noticed that pieces of the error messages from hs_err_pid9765042 says,

#  Internal Error (os_aix.cpp:3514), pid=9765042, tid=6940
#  Error: Unimplemented()

So is it related to some unimplemented functions from HotSpot?
is there a workaround besides removing "-agentvm" option?

Thanks and best regards!
- Jonathan

------

[1] https://blogs.oracle.com/jjg/entry/jtreg_old_and_new
[2] http://cr.openjdk.java.net/~luchsh/hs_err_pid9765042.log
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