Details
P1: Critical Description
Greetings,
I was working on an open-source Qt6 application
https://github.com/kitswas/VirtualGamePad-PC
At some point in January 2024, the app suddenly started crashing abruptly on my PC.
I am running Windows 11. (OS Build 22631.3155 with Windows Feature Experience Pack 1000.22684.1000.0)
I also tried it on a friend's machine (Windows 11, same setup/config) where it still works perfectly.
I have tried builds using both Qt 6.5 and 6.6.
The only hint I have is that when running the app under a debugger,
I see the following output
Page heap: pid 0x1698: page heap enabled with flags 0x3. AVRF: VGamepadPC.exe: pid 0x1698: flags 0x81643027: application verifier enabled ======================================= VERIFIER STOP 000000000000E107: pid 0x1698: A Winsock API was called before a successful WSAStartup() or after a balancing successful WSACleanup() call was made 0000000000000000 : Last sucessfull WSAStartup call by this caller. Use dps to dump the stack if not NULL 0000000000000000 : Last sucessfull WSACleanup call by this caller. Use dps to dump the stack if not NULL 0000021AA6BA36C0 : Last successful WSAStartup call in this process. Use dps to dump the stack if not NULL 0000000000000000 : Last sucessfull WSACleanup call in this process. Use dps to dump the stack if not NULL ======================================= This verifier stop is continuable. After debugging it use `go' to continue. =======================================
This occurs at line 76 in src/networking/server.cpp.
The call to tcpServer->listen() fails on trying to start the server.
The app has no manual Winsock API call(s).
Here's the stack trace:
1 vrfcore!VerifierStopMessageEx 0x7ffe89eb26e8 2 ?? 0x7ffe8b6d1599 3 ?? 0x7ffe8b6d16a0 4 ?? 0x7ffe8b6dc4b6 5 QNetworkProxyFactory::systemProxyForQuery(QNetworkProxyQuery const&) 0x7ffe40481e3f 6 QAbstractSocket::qt_metacall(QMetaObject::Call, int, void * *) 0x7ffe4042897b 7 QTcpServer::listen(QHostAddress const&, unsigned short) 0x7ffe4042aef1 8 Server::initServer server.cpp 76 0x7ff66b8f37ee 9 Server::Server server.cpp 56 0x7ff66b8f35b7 10 MainWindow::launch_server mainwindow.cpp 26 0x7ff66b8f1d5b 11 QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (MainWindow:: *)()>::call(void (MainWindow:: *)(), MainWindow *, void * *) qobjectdefs_impl.h 145 0x7ff66b908975 12 QtPrivate::FunctionPointer<void (MainWindow:: *)()>::call<QtPrivate::List<>, void>(void (MainWindow:: *)(), MainWindow *, void * *) qobjectdefs_impl.h 182 0x7ff66b90919c 13 QtPrivate::QCallableObject<void (MainWindow:: *)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void * *, bool *) qobjectdefs_impl.h 520 0x7ff66b90937a 14 z_adler32_combine 0x7ffe40b61df1 15 QAbstractButton::toggled(bool) 0x7ffe3f485e9d 16 QAbstractButton::mousePressEvent(QMouseEvent *) 0x7ffe3f4867e6 17 QWidget::event(QEvent *) 0x7ffe3f3da268 18 QApplicationPrivate::notify_helper(QObject *, QEvent *) 0x7ffe3f395066 19 QApplication::notify(QObject *, QEvent *) 0x7ffe3f39e23c 20 QCoreApplication::sendSpontaneousEvent(QObject *, QEvent *) 0x7ffe40870b58 ... <More>
Please help.
Is this a problem in the Qt Framework itself? Can the maintainers take a look?
If it's a coding problem, kindly show me the way.
This was earlier posted at https://forum.qt.io/topic/154594/winsock-api-problems-in-qtcpserver.