rednaxelafx

import java.lang.reflect.Field;
import sun.misc.Unsafe;

public class TestThreadStackSize {
  private static void crashVM() {
    try {
      makeSegfault(getUnsafe());
    } catch (Exception e) {
      // swallow
    }

rednaxelafx

import java.nio.*;
import java.util.*;

public class DirectMemoryCrashDemo {
  private static int BUFFER_COUNT = 82;
  private static int K = 1024;
  private static int M = K * K;
  private static int PAGE_SIZE = 4*K;

  public static void main(String[] args) {

rednaxelafx

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class StackOverflowCrashDemo */

#ifndef _Included_StackOverflowCrashDemo
#define _Included_StackOverflowCrashDemo
#ifdef __cplusplus
extern "C" {
#endif
/*

rednaxelafx

public class Main {
    public static void main(String[] args) {
        Test test = new Test();
        test.fn();
    }
}

rednaxelafx

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class JNILocalRefLeakDemo */

#ifndef _Included_JNILocalRefLeakDemo
#define _Included_JNILocalRefLeakDemo
#ifdef __cplusplus
extern "C" {
#endif
/*

rednaxelafx

// Pseudo-code that implements Cheney's algorithm

class Object {
  // remains null for normal objects
  // non-null for forwarded objects
  Object* _forwardee;

public:
  void forward_to(address new_addr);
  Object* forwardee();

rednaxelafx

rednaxelafx@fx-laptop:/tmp
$ gedit xx.cpp
rednaxelafx@fx-laptop:/tmp
$ g++ -g xx.cpp 
rednaxelafx@fx-laptop:/tmp
$ g++ -v
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.4.4-14ubuntu5.1' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.4 --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix

rednaxelafx

$ top -H
...
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                         
19115 root      25   0  576m 217m 9432 R 99.7  5.3   1357:12 java                                                                                            
28347 root      25   0  576m 217m 9432 R 99.7  5.3   1191:05 java                                                                                            
26912 root      25   0  576m 217m 9432 R 99.3  5.3 114:58.57 java                                                                                            
 5607 root      25   0  576m 217m 9432 R 99.0  5.3  54:49.02 java            

rednaxelafx

import java.lang.instrument.Instrumentation;
import java.net.URL;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.Arrays;
import java.util.Comparator;

public class DumpClassURL {
  public static void agentmain(String agentArgs, Instrumentation inst) {
    Class<?>[] classes = inst.getAllLoadedClasses();

rednaxelafx

package fx.jvm.hotspot.tools;

import java.util.List;

import sun.jvm.hotspot.tools.Tool;

public class PrintThreadIds extends Tool {
    public static void main(String[] args) {
        PrintThreadIds tool = new PrintThreadIds();
        tool.start(args);