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/MiscTest9.java Secret
Created Apr 10, 2017

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#include <string.h>
#include "jni.h"
#include "jvmti.h"
/*
public class java.lang.ref.MyWeakReference extends java.lang.ref.WeakReference {};
*/
jbyte MyWeakReference_bytes[] = {
-54, -2, -70, -66, 0, 0, 0, 49, 0, 5, 1, 0, 29, 106, 97, 118,
97, 47, 108, 97, 110, 103, 47, 114, 101, 102, 47, 77, 121, 87, 101, 97,
107, 82, 101, 102, 101, 114, 101, 110, 99, 101, 7, 0, 1, 1, 0, 27,
106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 114, 101, 102, 47, 87, 101,
97, 107, 82, 101, 102, 101, 114, 101, 110, 99, 101, 7, 0, 3, 0, 1,
0, 2, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0
};
jsize MyWeakReference_len = 0x5C;
void JNICALL callback_ClassFileLoadHook_transform(jvmtiEnv *jvmti, JNIEnv* env,
jclass class_being_redefined, jobject loader, const char* name,
jobject protection_domain, jint class_data_len, const unsigned char* class_data,
jint* new_class_data_len, unsigned char** new_class_data) {
if (name && !strcmp(name, "java/lang/System")) {
(*env)->DefineClass(env, "java/lang/ref/MyWeakReference", NULL, MyWeakReference_bytes, MyWeakReference_len);
}
}
JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *vm, char *options, void *reserved) {
jvmtiEventCallbacks callbacks;
jvmtiCapabilities caps;
jvmtiEnv *jvmti;
(*vm)->GetEnv(vm, (void **)&jvmti, JVMTI_VERSION_9);
memset(&caps, 0, sizeof(caps));
memset(&callbacks, 0, sizeof(callbacks));
caps.can_generate_early_vmstart = 1;
caps.can_generate_all_class_hook_events = 1;
caps.can_generate_early_class_hook_events = 1;
callbacks.ClassFileLoadHook = &callback_ClassFileLoadHook_transform;
(*jvmti)->AddCapabilities(jvmti, &caps);
(*jvmti)->SetEventCallbacks(jvmti, &callbacks, sizeof(callbacks));
(*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL);
return 0;
}
package app1;
import java.lang.ref.WeakReference;
public class MiscTest9 {
public static void main(String[] args) throws Exception {
WeakReference<?> weak = new WeakReference<>(new MiscTest9());
boolean present = true;
while (present) {
System.out.println("Running GC");
System.gc();
present = weak.get() != null;
}
}
}
C:\XWork\Misc9>\Work\jvm\jdk-9-ea+160-jigsaw\bin\java -agentpath:c:\XWork\MinAgent\MinAgent\x64\Debug\MinAgent.dll -cp target\classes app1.MiscTest9
Running GC
Running GC
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000007224be47, pid=11252, tid=12148
#
# JRE version: Java(TM) SE Runtime Environment (9.0+160) (build 9-ea+160-jigsaw-nightly-h6207-20170316)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (9-ea+160-jigsaw-nightly-h6207-20170316, mixed mode, tiered, compressed oops, g1 gc, windows-amd64)
# Problematic frame:
# V [jvm.dll+0x2abe47] UpdateRSOopClosure::do_oop+0x47
#
# No core dump will be written. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\XWork\Misc9\hs_err_pid11252.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
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