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

[David Holmes]

That's quite an old version of the VM, and as it is a custom build I 
can't decode the information in the hs_err log file.

Can you update to a more recent version and see if the problem persists.

David Holmes

李健 said the following on 07/11/10 11:48:
> 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:
>  
> /[root at 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