Subject: [BUG] Crash in FFM when calling native function with std::make_unique<RtcManager>

[bai li]

The createRtcContext function is like this：

void createRtcContext(const char* localId, int logLevel, IceConfig*
iceConfig, DataChannelConfig* dataChannelConfig) {
    std::cout << "1" << std::endl;
    int expected = 0;
    bool success = state.compare_exchange_strong(expected, 1);
    if (!success) return;
    if (localId == nullptr) return;
    if (iceConfig == nullptr) return;
    if (dataChannelConfig == nullptr) return;
    std::cout << "2" << std::endl;
    std::string id = std::string(localId);
    std::cout << "2 1" << " " << id << std::endl;
    std::make_unique<int>(3);
    std::cout << "2 1 1" << std::endl;
    rtcManager = std::make_unique<RtcManager>(); // Crash here!
    std::cout << "2 1 2" << std::endl;
    rtcManager->setLocalId(id);
    std::cout << "2 2" << std::endl;
    rtcManager->initLogger(logLevel);
    std::cout << "2 3" << std::endl;
    IceModel iceModel;
    std::cout << "2 4" << std::endl;
    iceModel.setNoStun(iceConfig->noStun);
    iceModel.setStunServer(std::string(iceConfig->stunServer));
    iceModel.setStunPort(iceConfig->stunPort);
    iceModel.setUdpMux(iceConfig->udpMux);
    iceModel.setWebSocketServer(std::string(iceConfig->webSocketServer));
    iceModel.setWebSocketPort(iceConfig->webSocketPort);
    std::cout << "2 5" << std::endl;
    auto dataChannelListener = DataChannelListener::Builder()
            .withOnOpen(dataChannelConfig->onOpen)
            .withOnClosed(dataChannelConfig->onClosed)
            .withOnTextMessage(dataChannelConfig->onTextMessage)
            .withOnBinaryMessage(dataChannelConfig->onBinaryMessage)
            .build();
    std::cout << "2 6" << std::endl;
    std::shared_ptr<DataChannelListener> dcListener =
std::move(dataChannelListener);
    std::cout << "3" << std::endl;
    rtcManager->initDataChannelListener(dcListener);
    std::cout << "4" << std::endl;
    std::unique_ptr<WebSocketHelper> webSocketHelper =
rtcManager->connectToSignalingServer(iceModel);
    std::cout << "5" << std::endl;
    while (state.load() == 1) {
        std::this_thread::yield();
    }
    std::cout << "6" << std::endl;
}


On Mon, Mar 31, 2025 at 5:26 PM bai li <k3315368931 at gmail.com> wrote:

> Hi Panama team,
>
> I’m using the Java FFM API in JDK 21 to call a C++ dynamic library
> function, `void createRtcContext(const char* localId, int logLevel,
> IceConfig* iceConfig, DataChannelConfig* dataChannelConfig)`. The function
> can be invoked, but it crashes when executing
> `std::make_unique<RtcManager>()` inside the function. The same C++ code
> runs without any issues when executed independently. The `RtcManager` class
> is roughly defined as follows:
>
> ```cpp
> class RtcManager {
> private:
>     std::string localId;
>     rtc::Configuration config;
>     std::unordered_map<std::string, std::shared_ptr<rtc::PeerConnection>>
> peerConnectionMap;
>     std::unordered_map<std::string, std::shared_ptr<rtc::DataChannel>>
> dataChannelMap;
>     std::shared_ptr<rtc::WebSocket> ws =
> std::make_shared<rtc::WebSocket>();
>     std::shared_ptr<DataChannelListener> dataChannelListener = nullptr;
> public:
>     explicit RtcManager(const std::string& id) : localId(id) {}
> };
> The C++ code is compiled with MSVC 2022. Here’s the crash log from the
> console:
> # A fatal error has been detected by the Java Runtime Environment:
> #
> #  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffb0ca62f58,
> pid=22096, tid=26348
> #
> # JRE version: Java(TM) SE Runtime Environment (21.0.6+8) (build
> 21.0.6+8-LTS-188)
> # Java VM: Java HotSpot(TM) 64-Bit Server VM (21.0.6+8-LTS-188, mixed
> mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc,
> windows-amd64)
> # Problematic frame:
> # C  [msvcp140.dll+0x12f58]
> #
> # 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:
> # E:\projects\backend-projects\test\hs_err_pid22096.log
> [0.236s][warning][os] Loading hsdis library failed
> #
> # If you would like to submit a bug report, please visit:
> #   https://bugreport.java.com/bugreport/crash.jsp
> # The crash happened outside the Java Virtual Machine in native code.
> # See problematic frame for where to report the bug.
> #
> Thanks
>
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