How do you call JNI_CreateJavaVM without Valgrind errors?

Question

When compiling and running the following code under valgrind, I consistently get "Invalid write of size 4" errors. Is there a clean way of calling JNI_CreateJavaVM() so that valgrind doesn't throw a fit?

#include <jni.h>
#include <stdlib.h>
#include <string.h>

int main()
{
    JavaVMInitArgs * vm_args = calloc(1, sizeof(JavaVMInitArgs));
    JavaVM * jvm = NULL;
    JNIEnv * env = NULL;

    vm_args->version = JNI_VERSION_1_6;
    vm_args->nOptions = 0;
    vm_args->options = NULL;

    JNI_CreateJavaVM(&jvm, (void **)&env, vm_args);

    return 0;
}

Here is the valgrind command I am running:

valgrind --tool=memcheck --leak-check=yes --num-callers=20 --smc-check=all ./test

A single entry from my loooonng valgrind log:

==9004== Invalid write of size 4
==9004==    at 0x4D5A3C8: ???
==9004==    by 0x4D512CB: ???
==9004==    by 0x423374F: JavaCalls::call_helper(JavaValue*, methodHandle*, JavaCallArguments*, Thread*) (in /usr/java/jdk1.6.0_21/jre/lib/i386/client/libjvm.so)
==9004==    by 0x4361B67: os::os_exception_wrapper(void (*)(JavaValue*, methodHandle*, JavaCallArguments*, Thread*), JavaValue*, methodHandle*, JavaCallArguments*, Thread*) (in /usr/java/jdk1.6.0_21/jre/lib/i386/client/libjvm.so)
==9004==    by 0x42335AE: JavaCalls::call(JavaValue*, methodHandle, JavaCallArguments*, Thread*) (in /usr/java/jdk1.6.0_21/jre/lib/i386/client/libjvm.so)
==9004==    by 0x420F8C5: instanceKlass::call_class_initializer_impl(instanceKlassHandle, Thread*) (in /usr/java/jdk1.6.0_21/jre/lib/i386/client/libjvm.so)
==9004==    by 0x420E650: instanceKlass::initialize_impl(instanceKlassHandle, Thread*) (in /usr/java/jdk1.6.0_21/jre/lib/i386/client/libjvm.so)
==9004==    by 0x420DB97: instanceKlass::initialize(Thread*) (in /usr/java/jdk1.6.0_21/jre/lib/i386/client/libjvm.so)
==9004==    by 0x420E8AB: instanceKlass::initialize_impl(instanceKlassHandle, Thread*) (in /usr/java/jdk1.6.0_21/jre/lib/i386/client/libjvm.so)
==9004==    by 0x420DB97: instanceKlass::initialize(Thread*) (in /usr/java/jdk1.6.0_21/jre/lib/i386/client/libjvm.so)
==9004==    by 0x440D660: Threads::create_vm(JavaVMInitArgs*, bool*) (in /usr/java/jdk1.6.0_21/jre/lib/i386/client/libjvm.so)
==9004==    by 0x4265395: JNI_CreateJavaVM (in /usr/java/jdk1.6.0_21/jre/lib/i386/client/libjvm.so)
==9004==    by 0x804845F: main (jvm.c:15)
==9004==  Address 0xbeb54078 is not stack'd, malloc'd or (recently) free'd

Thanks, Chenz

Answer 1

Since this is an error within the JVM you can just choose to supress it. Valgrind can be configured to supress specific errors. You can find more details here