Re: [JVMTI]Run error with SetFieldModificationWatch on every field in SPECJBB2005

[Daniel D. Daugherty]

Li jian,

I'm redirecting this e-mail thread to serviceability-...@...
as this is a JVM/TI question. hotspot-...@... is named by Bcc and
will drop off after this e-mail...

This crash appears to be using a very old version of OpenJDK6.
The OpenJDK6 project is currently at B21 and this crash is from
B12 (Mon Oct 27 16:16:00 EDT 2008).

Can you please retry your experiment with something more recent?

Dan


On 7/10/2010 7:48 PM, 李健 wrote:

Hi all,

I've run OpenJDK1.6 on Fedora10 with a JVMTI which watch every field access. The field modification callback method simply return and do nothing. But OpenJDK randomly throw a bug like this: /Start User Threads

  started user thread for Warehouse 1
  started user thread for Warehouse 2
  started user thread for Warehouse 3
Timing Measurement began Sun Jul 11 09:10:48 CST 2010 for 4 minutes
#
# An unexpected error has been detected by Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00f0ec91, pid=10295, tid=5340048
#
# Java VM: OpenJDK Server VM (1.6.0_0-b12 mixed mode linux-x86)
# Distribution: Custom build (Mon Oct 27 16:16:00 EDT 2008)
# Problematic frame:
# V  [libjvm.so+0x471c91]
#
# An error report file with more information is saved as:
# /media/_home/lijian/specjbb2005/dist/hs_err_pid10295.log
#
# If you would like to submit a bug report, please include
# instructions how to reproduce the bug and visit:
#   //http://java.sun.com/webapps/bugreport/crash.jsp/
/#
Aborted
/
Any one can help me with this internal bug? I'll be very appreciate!
/ /

Here's my JVMTI source code: /static void JNICALL

FieldModifyCallBack(jvmtiEnv *jvmti_env,
                        JNIEnv* jni_env,
            jthread thread,
            jmethodID method,
            jlocation location,
            jclass field_klass,
            jobject object,
            jfieldID field,
            char signature_type,
            jvalue new_value)/
/{/
/    //do nothing/
/}/

/static void JNICALL

ClassPrepareCallback(jvmtiEnv *jvmti_env,
            JNIEnv* jni_env,
            jthread thread,
            jclass klass)
{
        jint field_num;
        jfieldID * fieldIDs;

jvmtiError error = jvmti_env->GetClassFields(klass, &field_num, &fieldIDs);/

/        if(error != JVMTI_ERROR_NONE)
                fprintf(stderr, "!!!%d\n", error);
        for(int i=0; i< field_num;i++)
        {/

/ error = jvmti_env->SetFieldModificationWatch(klass,fieldIDs[i]);

                if(error != JVMTI_ERROR_NONE)
                        fprintf(stderr, "!!!\n");
        }
        error = jvmti_env->Deallocate((unsigned char*)fieldIDs);
        if(error != JVMTI_ERROR_NONE)
                fprintf(stderr, "!!!\n");/
/}/

/JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved)

{
        static jvmtiEnv *jvmti = NULL;
        static jvmtiCapabilities capa;
        jvmtiError error;

jint ret = (jvm)->GetEnv((void **)(&jvmti), JVMTI_VERSION_1_0);

        (void)memset(&capa, 0, sizeof(jvmtiCapabilities));
        capa.can_generate_field_modification_events = 1;
        error = jvmti->AddCapabilities(&capa);
        if(error != JVMTI_ERROR_NONE)
                        fprintf(stderr, "!!!\n");/
/        error = jvmti->SetEventNotificationMode(JVMTI_ENABLE,
                JVMTI_EVENT_CLASS_PREPARE, (jthread)NULL);
        if(error != JVMTI_ERROR_NONE)
                fprintf(stderr, "!!!\n");
        error = jvmti->SetEventNotificationMode(JVMTI_ENABLE,
                        JVMTI_EVENT_FIELD_MODIFICATION, NULL);
        if(error != JVMTI_ERROR_NONE)
                fprintf(stderr, "!!!\n");

jvmtiEventCallbacks callbacks;

        (void)memset(&callbacks, 0, sizeof(callbacks));/
/        callbacks.ClassPrepare= &ClassPrepareCallback;
        callbacks.FieldModification = &FieldModifyCallBack;

error = jvmti->SetEventCallbacks(&callbacks,(jint)sizeof(callbacks));

        if(error != JVMTI_ERROR_NONE)
                fprintf(stderr, "!!!\n");

return JNI_OK;

}

/ /JNIEXPORT void JNICALL Agent_OnUnload(JavaVM *jvm)

{/
/        return;
}/

Here's my openJDK version: /[r...@localhost dist]# java -versionjava version "1.6.0_0"

IcedTea6 1.3.1 (6b12-Fedora-10) Runtime Environment (build 1.6.0_0-b12)
OpenJDK Server VM (build 1.6.0_0-b12, mixed mode)/

// The attachment is /hs_err_pid10295.log/ Thanks a lot!

--
Li jian
China