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Type: Bug
Resolution: Unresolved
Priority: P2: Important
Fix Version/s: None
Affects Version/s: 6.10.0 RC
Component/s: WebEngine
Labels:
None
Environment:
Archlinux, gcc 15.2.1

Consider this example, which defines a custom QWebEngineUrlScheme::LocalScheme scheme but then uses QWebEnginePage::acceptNavigationRequest to allow certain navigations based on custom logic:

#include <QApplication>
#include <QWebEngineView>
#include <QWebEngineProfile>
#include <QWebEnginePage>
#include <QWebEngineUrlScheme>
#include <QWebEngineUrlSchemeHandler>
#include <QWebEngineUrlRequestJob>
#include <QBuffer>
#include <QByteArray>
#include <QUrl>

class SchemeHandler : public QWebEngineUrlSchemeHandler {
public:
    using QWebEngineUrlSchemeHandler::QWebEngineUrlSchemeHandler;

    void requestStarted(QWebEngineUrlRequestJob *job) override {
        auto buffer = new QBuffer(job);
        buffer->setData("<html><body><a href=\"https://qt.io\">Qt</a></body></html>");
        job->reply("text/html", buffer);
    }
};

class Page : public QWebEnginePage {
public:
    using QWebEnginePage::QWebEnginePage;

protected:
    bool acceptNavigationRequest(const QUrl &requestedUrl, NavigationType type, bool isMainFrame) override {
        // explicitly allow external navigation; real code does more validation here
        if (url().scheme() == "myscheme" && requestedUrl.scheme() == "https") {
            load(requestedUrl);
            return false;
        }
        return true;
    }
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QWebEngineUrlScheme scheme("myscheme");
    scheme.setFlags(QWebEngineUrlScheme::LocalScheme);
    QWebEngineUrlScheme::registerScheme(scheme);

    auto handler = new SchemeHandler(&app);
    auto profile = QWebEngineProfile::defaultProfile();
    profile->installUrlSchemeHandler("myscheme", handler);

    auto view = new QWebEngineView;
    auto page = new Page(profile, view);
    view->setPage(page);

    view->load(QUrl("myscheme://test"));
    view->show();

    return app.exec();
}

QT += widgets webenginewidgets
SOURCES += scheme.cpp
TARGET = scheme

Click the link once the view opens. With Qt <= 6.9, it works mostly fine (though sometimes seems to hang the renderer process, if it doesn't, try right-clicking and going back and then forward again).

With Qt 6.10, a release build fails with SIGTRAP, while a debug build shows [454984:454984:0925/150603.628568:FATAL:intercept_navigation_throttle.cc(91)] Check failed: weak_this.

Stacktrace:

#0 0x7f33ba9ae0f1 base::debug::CollectStackTrace() [./../../../3rdparty/chromium/base/debug/stack_trace_posix.cc:1057:38]
#1 0x7f33ba9709e0 base::debug::StackTrace::StackTrace() [./../../../3rdparty/chromium/base/debug/stack_trace.cc:254:37]
#2 0x7f33ba970947 base::debug::StackTrace::StackTrace() [./../../../3rdparty/chromium/base/debug/stack_trace.cc:249:56]
#3 0x7f33ba6e4872 logging::LogMessage::Flush() [../../../3rdparty/chromium/base/logging.cc:737:29]
#4 0x7f33ba6e4744 logging::LogMessage::~LogMessage() [../../../3rdparty/chromium/base/logging.cc:725:8]
#5 0x7f33ba6f2469 logging::(anonymous namespace)::CheckLogMessage::~CheckLogMessage() [./../../../3rdparty/chromium/base/check.cc:198:3]
#6 0x7f33ba6f248e logging::(anonymous namespace)::CheckLogMessage::~CheckLogMessage() [./../../../3rdparty/chromium/base/check.cc:198:3]
#7 0x7f33ba6f79c0 std::default_delete<>::operator()() [/usr/include/c++/15.2.1/bits/unique_ptr.h:93:2]
#8 0x7f33ba6f7a20 std::__uniq_ptr_impl<>::reset() [/usr/include/c++/15.2.1/bits/unique_ptr.h:205:16]
#9 0x7f33ba6f6f8c std::unique_ptr<>::reset() [/usr/include/c++/15.2.1/bits/unique_ptr.h:512:12]
#10 0x7f33ba6f2b37 logging::CheckNoreturnError::~CheckNoreturnError() [./../../../3rdparty/chromium/base/check.cc:350:21]
#11 0x7f33bac46cfe navigation_interception::InterceptNavigationThrottle::CheckIfShouldIgnoreNavigation() [../../../3rdparty/chromium/components/navigation_interception/intercept_navigation_throttle.cc:91:3]
#12 0x7f33bac46a52 navigation_interception::InterceptNavigationThrottle::WillStartRequest() [../../../3rdparty/chromium/components/navigation_interception/intercept_navigation_throttle.cc:41:40]
#13 0x7f33b666a998 content::(anonymous namespace)::ExecuteNavigationEvent() [../../../3rdparty/chromium/content/browser/renderer_host/navigation_throttle_runner.cc:48:41]
#14 0x7f33b666d071 content::NavigationThrottleRunner::ProcessInternal() [../../../3rdparty/chromium/content/browser/renderer_host/navigation_throttle_runner.cc:360:67]
#15 0x7f33b666b0db content::NavigationThrottleRunner::ProcessNavigationEvent() [../../../3rdparty/chromium/content/browser/renderer_host/navigation_throttle_runner.cc:143:18]
#16 0x7f33b6612555 content::NavigationRequest::WillStartRequest() [../../../3rdparty/chromium/content/browser/renderer_host/navigation_request.cc:7748:43]
#17 0x7f33b65f8ea6 content::NavigationRequest::BeginNavigationImpl() [../../../3rdparty/chromium/content/browser/renderer_host/navigation_request.cc:2872:19]
#18 0x7f33b65f6df8 content::NavigationRequest::BeginNavigation() [../../../3rdparty/chromium/content/browser/renderer_host/navigation_request.cc:2452:22]
#19 0x7f33b668a72d content::Navigator::OnBeginNavigation() [../../../3rdparty/chromium/content/browser/renderer_host/navigator.cc:1292:38]
#20 0x7f33b66e1517 content::RenderFrameHostImpl::BeginNavigation() [../../../3rdparty/chromium/content/browser/renderer_host/render_frame_host_impl.cc:10968:50]
#21 0x7f33b4f471bb content::mojom::FrameHostStubDispatch::Accept() [gen/content/common/frame.mojom.cc:5511:28]
#22 0x7f33b678a6e9 content::mojom::FrameHostStub<>::Accept() [gen/content/common/frame.mojom.h:851:41]
#23 0x7f33bc04cf9a mojo::InterfaceEndpointClient::HandleValidatedMessage() [../../../3rdparty/chromium/mojo/public/cpp/bindings/lib/interface_endpoint_client.cc:1052:60]
#24 0x7f33bc048683 mojo::InterfaceEndpointClient::HandleIncomingMessageThunk::Accept() [../../../3rdparty/chromium/mojo/public/cpp/bindings/lib/interface_endpoint_client.cc:371:40]
#25 0x7f33bc05f514 mojo::MessageDispatcher::Accept() [../../../3rdparty/chromium/mojo/public/cpp/bindings/lib/message_dispatcher.cc:48:30]
#26 0x7f33bc04aba2 mojo::InterfaceEndpointClient::HandleIncomingMessage() [../../../3rdparty/chromium/mojo/public/cpp/bindings/lib/interface_endpoint_client.cc:724:26]
#27 0x7f33bc71204c IPC::ChannelAssociatedGroupController::AcceptOnEndpointThread() [../../../3rdparty/chromium/ipc/ipc_mojo_bootstrap.cc:1202:45]
#28 0x7f33bc71d609 base::internal::DecayedFunctorTraits<>::Invoke<>() [../../../3rdparty/chromium/base/functional/bind_internal.h:729:37]
#29 0x7f33bc71b258 base::internal::InvokeHelper<>::MakeItSo<>() [../../../3rdparty/chromium/base/functional/bind_internal.h:921:26]
#30 0x7f33bc717648 base::internal::Invoker<>::RunImpl<>() [../../../3rdparty/chromium/base/functional/bind_internal.h:1058:72]
#31 0x7f33bc714566 base::internal::Invoker<>::RunOnce() [../../../3rdparty/chromium/base/functional/bind_internal.h:971:19]
#32 0x7f33acb41ddd base::OnceCallback<>::Run() [../../../3rdparty/chromium/base/functional/callback.h:156:13]
#33 0x7f33ba83f438 base::TaskAnnotator::RunTaskImpl() [./../../../3rdparty/chromium/base/task/common/task_annotator.cc:209:37]
#34 0x7f33ba8914e4 base::TaskAnnotator::RunTask<>() [../../../3rdparty/chromium/base/task/common/task_annotator.h:106:16]
#35 0x7f33ba8885bd base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWorkImpl() [./../../../3rdparty/chromium/base/task/sequence_manager/thread_controller_with_message_pump_impl.cc:456:30]
#36 0x7f33ba8875df base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWork() [./../../../3rdparty/chromium/base/task/sequence_manager/thread_controller_with_message_pump_impl.cc:330:50]
#37 0x7f33aca00e18 QtWebEngineCore::MessagePumpForUIQt::handleScheduledWork() [/home/florian/proj/qt/dev6/qt5/qtwebengine/src/core/browser_main_parts_qt.cpp:155:48]
#38 0x7f33aca00a0f QtWebEngineCore::MessagePumpForUIQt::MessagePumpForUIQt()::{lambda()#1}::operator()() [/home/florian/proj/qt/dev6/qt5/qtwebengine/src/core/browser_main_parts_qt.cpp:106:53]
#39 0x7f33aca05160 std::__invoke_impl<>() [/usr/include/c++/15.2.1/bits/invoke.h:63:36]
#40 0x7f33aca043a8 std::__invoke_r<>() [/usr/include/c++/15.2.1/bits/invoke.h:113:28]
#41 0x7f33aca02c6d std::_Function_handler<>::_M_invoke() [/usr/include/c++/15.2.1/bits/std_function.h:292:30]
#42 0x7f33aca34ca0 std::function<>::operator()() [/usr/include/c++/15.2.1/bits/std_function.h:593:9]
#43 0x7f33ba6a5724 QWebEngineMessagePumpScheduler::timerEvent()
#44 0x7f33a769fa06 QObject::event()
#45 0x7f33d31bdf94 QApplicationPrivate::notify_helper()
#46 0x7f33d31bdd5c QApplication::notify()
#47 0x7f33a75fefbb QCoreApplication::notifyInternal2()
#48 0x7f33a75ffbc3 QCoreApplication::sendEvent()
#49 0x7f33a7600d1b QCoreApplicationPrivate::sendPostedEvents()
#50 0x7f33a76004df QCoreApplication::sendPostedEvents()
#51 0x7f33a7affcaf postEventSourceDispatch()
#52 0x7f33a5c9d880 (/usr/lib/libglib-2.0.so.0.8400.4+0x5e87f)
#53 0x7f33a5c9ecd7 (/usr/lib/libglib-2.0.so.0.8400.4+0x5fcd6)
#54 0x7f33a5c9eee5 g_main_context_iteration
#55 0x7f33a7b006ba QEventDispatcherGlib::processEvents()
#56 0x7f33a2b05f90 QXcbGlibEventDispatcher::processEvents()
#57 0x7f33a761659e QEventLoop::processEvents()
#58 0x7f33a7616995 QEventLoop::exec()
#59 0x7f33a75ff961 QCoreApplication::exec()
#60 0x7f33a984327c QGuiApplication::exec()
#61 0x7f33d31bab27 QApplication::exec()
#62 0x55ecd240b587 main
#63 0x7f33a6c27675 (/usr/lib/libc.so.6+0x27674)
#64 0x7f33a6c27729 __libc_start_main
#65 0x55ecd240b285 _start

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