JVM crashes on Windows when using JNI to call a C++ dll using a mutex

[aaron-bray]

I have created a windows dll with a main.cpp containing only the following function, loaded the dll in Java 8
to call said native function, and it blows up in the lock method if I use the dynamic runtime /MD but runs fine if built with the /MT

This worked in jdk1.8.0_372, but now fails in jdk1.8.0_412

hs_err_pid21540.log

#include <jni.h>
#include <iostream>
#include <mutex>

extern "C"
JNIEXPORT jboolean JNICALL Java_com_kitware_MutexTest_nativeMutex(JNIEnv* env, jobject obj)
{
  std::cout << "Hello" << std::endl;
  std::mutex mtx;
  mtx.lock();
  std::cout << "World" << std::endl;
  return true;
}

Using this as my CMakeLists.txt do build the dll

cmake_minimum_required(VERSION 3.26)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED True)
set(CMAKE_CXX_EXTENSIONS False)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)


project(JNIMutex LANGUAGES C CXX)

find_package(Java REQUIRED)
if(Java_FOUND)
  include(UseJava)
  find_package(JNI REQUIRED)
  if(Java_JAVA_EXECUTABLE)
    message(STATUS "Using Java executable : ${Java_JAVA_EXECUTABLE}")
    set(Java_CMD ${Java_JAVA_EXECUTABLE})
  else()
    message(STATUS "Could not find Java_JAVA_EXECUTABLE")
  endif()
endif()

# Uncommented == /MT (OK!), Commented == /MD (Crash)
#set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")

add_library(mutex SHARED main.cpp)
message(STATUS "JNI_INCLUDE_DIRS : ${JNI_INCLUDE_DIRS}")
target_include_directories(mutex PRIVATE ${JNI_INCLUDE_DIRS})

Java file calling this native method:

package com.kitware;

public class MutexTest
{
  public static void main(String[] args)
  {
    try
    {
      System.loadLibrary("mutex");
      MutexTest mt = new MutexTest();
      mt.nativeMutex();
    }
    catch(Exception ex)
    {
      System.out.println("Error: "+ex);
    }
  }
  public native boolean nativeMutex();
}

[aaron-bray]

It looks like this problems goes all the way up to MSVC

https://stackoverflow.com/questions/78598141/first-stdmutexlock-crashes-in-application-built-with-latest-visual-studio

This solution works and will keep any eye on MSVC for more about this issue

Thanks!