QtWebEngineCore on macOS: Fatal process out of memory: Failed to reserve memory for new V8 Isolate

[J0Nes]

Hey,

I have a QtQuick application and I instantiate a WebEngineView in a QtQuick Controls Popup:

WebEngineView {
            anchors.fill: parent
            url: "https://www.qt.io"
        }

Before the QGuiApplication is initialised, the QtWebEngine gets initialised:

QtWebEngine::initialize();

When starting the application from within QtCreator (debug/release) it works just fine. However, when deploying the app with the qtmacdeploy tool:

$QT/bin/macdeployqt "myapp.app" -qmldir="../qmldir/" 

The WebView stops working. When showing the view it prints:

#
# Fatal error in , line 0
# Fatal process out of memory: Failed to reserve memory for new V8 Isolate
#
#
#
#FailureMessage Object: 0x7ffee4a6c9700   QtWebEngineCore                     0x000000010e4b0b59 shape_detection::TextDetectionImplMac::Detect(SkBitmap const&, base::OnceCallback<void (std::__1::vector<mojo::StructPtr<shape_detection::mojom::TextDetectionResult>, std::__1::allocator<mojo::StructPtr<shape_detection::mojom::TextDetectionResult> > >)>) + 8105641
1   QtWebEngineCore                     0x000000010e3d95b3 shape_detection::TextDetectionImplMac::Detect(SkBitmap const&, base::OnceCallback<void (std::__1::vector<mojo::StructPtr<shape_detection::mojom::TextDetectionResult>, std::__1::allocator<mojo::StructPtr<shape_detection::mojom::TextDetectionResult> > >)>) + 7223555
2   QtWebEngineCore                     0x000000011099469b ui::CATransactionCoordinator::SynchronizeImpl() + 7105835
3   QtWebEngineCore                     0x0000000110964a92 ui::CATransactionCoordinator::SynchronizeImpl() + 6910242
4   QtWebEngineCore                     0x000000010cf2a82b GrMtlSemaphore::GrMtlSemaphore(id<MTLEvent>, unsigned long long) + 11362187
5   QtWebEngineCore                     0x000000010d19f7d2 GrMtlSemaphore::GrMtlSemaphore(id<MTLEvent>, unsigned long long) + 13938482
6   QtWebEngineCore                     0x000000010d19f965 GrMtlSemaphore::GrMtlSemaphore(id<MTLEvent>, unsigned long long) + 13938885
7   QtWebEngineCore                     0x000000010d06c986 GrMtlSemaphore::GrMtlSemaphore(id<MTLEvent>, unsigned long long) + 12681446
8   QtWebEngineCore                     0x000000011099037e ui::CATransactionCoordinator::SynchronizeImpl() + 7088654
9   QtWebEngineCore                     0x000000011075b1fd ui::CATransactionCoordinator::SynchronizeImpl() + 4774029
10  QtWebEngineCore                     0x000000011075bb13 ui::CATransactionCoordinator::SynchronizeImpl() + 4776355
11  QtWebEngineCore                     0x00000001104359f4 ui::CATransactionCoordinator::SynchronizeImpl() + 1474692
12  QtWebEngineCore                     0x00000001103ed254 ui::CATransactionCoordinator::SynchronizeImpl() + 1177828
13  QtWebEngineCore                     0x000000011200e347 ui::CATransactionCoordinator::SynchronizeImpl() + 30673367
14  QtWebEngineCore                     0x000000011200c878 ui::CATransactionCoordinator::SynchronizeImpl() + 30666504
15  QtWebEngineCore                     0x000000011200e19d ui::CATransactionCoordinator::SynchronizeImpl() + 30672941
16  QtWebEngineCore                     0x000000011203e836 ui::CATransactionCoordinator::SynchronizeImpl() + 30871238
17  QtWebEngineCore                     0x000000010de865e6 shape_detection::TextDetectionImplMac::Detect(SkBitmap const&, base::OnceCallback<void (std::__1::vector<mojo::StructPtr<shape_detection::mojom::TextDetectionResult>, std::__1::allocator<mojo::StructPtr<shape_detection::mojom::TextDetectionResult> > >)>) + 1640758
18  QtWebEngineCore                     0x00000001120ee733 ui::CATransactionCoordinator::SynchronizeImpl() + 31591875
19  QtWebEngineCore                     0x000000010de859f4 shape_detection::TextDetectionImplMac::Detect(SkBitmap const&, base::OnceCallback<void (std::__1::vector<mojo::StructPtr<shape_detection::mojom::TextDetectionResult>, std::__1::allocator<mojo::StructPtr<shape_detection::mojom::TextDetectionResult> > >)>) + 1637700
20  QtWebEngineCore                     0x000000010be6102b QtWebEngineCore::processMain(int, char const**) + 139
21  QtWebEngineProcess                  0x000000010b191ee7 main + 167
22  libdyld.dylib                       0x00007fff6ee91cc9 start + 1
23  ???                                 0x0000000000000010 0x0 + 16

I double checked and my app bundle contains these frameworks

• QtWebChannel.framework
• QtWebEngine.framework
• QtWebEngineCore.framework

where the core framework contains the QtWebEngineProcess.app helper and the *.pak resource files and locales. But anyway I'd assume to observe some different errors if the bundle is missing required Ressources.

The bundle is both signed and notarised. I am running macOS 10.15.7 and Qt 5.15.0
Thanks a lot

[J0Nes]

After more research it appears that signing my bundle causes the issue.
For a solution see https://forum.qt.io/topic/102212/qtwebengine-signing-issues/18