Details
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Bug
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Resolution: Fixed
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P1: Critical
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5.15.13, 6.2.8
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Windows 22H2, MSVC 2019 x64
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macOS,
Windows
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9971e5795 (tqtc/lts-5.15)
Description
Code
#include <QtMqtt> #include <QCoreApplication> int main(int argc, char *argv[]) { QCoreApplication app(argc, argv); QString hostname = "broker.hivemq.com"; quint16 port = 1883; QString topicText = "Hello"; QString messageText = "World"; auto client = new QMqttClient; client->setCleanSession(true); client->setHostname(hostname); client->setPort(port); qDebug() << "### Connecting to" << QString("%1:%2").arg(hostname).arg(port); client->connectToHost(); QObject::connect(client, &QMqttClient::connected, qApp, [=] { qDebug() << "Connected"; qDebug() << "### Subscribing to topic" << topicText; auto sub = client->subscribe(topicText, 1); QObject::connect(sub, &QMqttSubscription::stateChanged, qApp, [=](QMqttSubscription::SubscriptionState state) { qDebug() << "Subscription state:" << state; if (state == QMqttSubscription::Subscribed) { qDebug() << "### Publishing:" << QString("Topic=%1, Message=%2").arg(topicText, messageText); client->publish(QMqttTopicName(topicText), messageText.toUtf8(), 1); } }); QObject::connect(sub, &QMqttSubscription::messageReceived, qApp, [=](QMqttMessage message) { qDebug() << "Message received:" << message.payload(); qDebug("### Unsubscribing..."); sub->unsubscribe(); qDebug("### Disconnecting..."); client->disconnectFromHost(); qDebug("!!! I WILL CRASH NOW !!!"); }); }); QObject::connect(client, &QMqttClient::disconnected, qApp, [] { qDebug("Disconnected"); }); return app.exec(); }
Debug output
15:49:08: Starting Z:\QtSupport\00472934\build-mqtttest-Desktop_Qt_5_15_13_MSVC2019_64bit-Debug\debug\mqtttest.exe... ### Connecting to "broker.hivemq.com:1883" Connected ### Subscribing to topic "Hello" Subscription state: 2 ### Publishing: "Topic=Hello, Message=World" Message received: "World" ### Unsubscribing... Subscription state: 3 ### Disconnecting... Disconnected !!! I WILL CRASH NOW !!! 15:49:11: Z:\QtSupport\00472934\build-mqtttest-Desktop_Qt_5_15_13_MSVC2019_64bit-Debug\debug\mqtttest.exe crashed.
Stack trace
1 QCommandLineOption::isHidden Qt5Cored 0x7ff80380a8c5 2 QMqttMessage::operator== Qt5Mqttd 0x7ff8876eaf1e 3 QMqttMessage::operator== Qt5Mqttd 0x7ff8876dd440 4 QMqttMessage::operator== Qt5Mqttd 0x7ff8876de448 5 QMqttMessage::operator== Qt5Mqttd 0x7ff8876de333 6 QMqttMessage::operator== Qt5Mqttd 0x7ff8876db271 7 QMqttMessage::operator== Qt5Mqttd 0x7ff8876ebaec 8 QMqttMessage::operator== Qt5Mqttd 0x7ff8876e8687 9 QMqttMessage::operator== Qt5Mqttd 0x7ff8876ede41 10 QCommandLineOption::isHidden Qt5Cored 0x7ff803b56222 11 QCommandLineOption::isHidden Qt5Cored 0x7ff803bb09b8 12 QCommandLineOption::isHidden Qt5Cored 0x7ff803b9cd77 13 QCommandLineOption::isHidden Qt5Cored 0x7ff8039e0f80 14 QNetworkInterface::interfaceNameFromIndex Qt5Networkd 0x7ff80a46abec 15 QNetworkInterface::interfaceNameFromIndex Qt5Networkd 0x7ff80a468035 16 QNetworkInterface::interfaceNameFromIndex Qt5Networkd 0x7ff80a46ece0 17 QNetworkInterface::interfaceNameFromIndex Qt5Networkd 0x7ff80a461937 18 QNetworkInterface::interfaceNameFromIndex Qt5Networkd 0x7ff80a492dfc 19 QCommandLineOption::isHidden Qt5Cored 0x7ff803b3cfe1 20 QCommandLineOption::isHidden Qt5Cored 0x7ff803b3f13f 21 QCommandLineOption::isHidden Qt5Cored 0x7ff803b3a3e1 22 QCommandLineOption::isHidden Qt5Cored 0x7ff803b3bb4f 23 QCommandLineOption::isHidden Qt5Cored 0x7ff803b39c32 24 QCommandLineOption::isHidden Qt5Cored 0x7ff803c1182d 25 CallWindowProcW USER32 0x7ff8c0ebe858 26 DispatchMessageW USER32 0x7ff8c0ebe299 27 QCommandLineOption::isHidden Qt5Cored 0x7ff803c12296 28 QCommandLineOption::isHidden Qt5Cored 0x7ff803b363db 29 QCommandLineOption::isHidden Qt5Cored 0x7ff803b36644 30 QCommandLineOption::isHidden Qt5Cored 0x7ff803b399b9 31 main main.cpp 53 0x7ff673f21ad2 32 WinMain qtmain_win.cpp 97 0x7ff673f27675 33 invoke_main exe_common.inl 107 0x7ff673f24e42 34 __scrt_common_main_seh exe_common.inl 288 0x7ff673f24cee 35 __scrt_common_main exe_common.inl 331 0x7ff673f24bae 36 WinMainCRTStartup exe_winmain.cpp 17 0x7ff673f24ede 37 BaseThreadInitThunk KERNEL32 0x7ff8c1067604 38 RtlUserThreadStart ntdll 0x7ff8c1ae26a1
Notes
Qt 6.5.0 does not crash but prints a message at the end,
QIODevice::write (QTcpSocket): device not open
Attachments
Issue Links
- relates to
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- Closed
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| For Gerrit Dashboard: QTBUG-112984 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 473462,1 | Send PUBACK before emitting QMqttSubscription::messageReceived | dev | qt/qtmqtt | Status: ABANDONED | -1 | 0 |
| 482531,2 | Fix crash in QMqttConnection::finalize_publish | tqtc/lts-5.15 | qt/tqtc-qtmqtt | Status: MERGED | +2 | 0 |