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  1. Qt
  2. QTBUG-115090

[macOS] QCocoaWindow::devicePixelRatio called from scenegraph render thread results in warning

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    • macOS

    Description

      Cloned / Separated out from QTBUG-113973 as this issue seems to be separate. In short, it seems like the QQuickWindow ends up calling NSView convertSizeToBacking from the wrong thread.

       

      Please see attached project.
      Configure with CMake for Xcode generator, run with Xcode.

      API is supposed to be used from main thread only.

      Main Thread Checker
/Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtbase/src/plugins/platforms/cocoa/qcocoawindow.mm:1925 -[NSView convertSizeToBacking:] must be used from main thread only

Thread 26
#0	0x000000010625a98b in QCocoaWindow::devicePixelRatio() const [inlined] at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtbase/src/plugins/platforms/cocoa/qcocoawindow.mm:1925
#1	0x000000010625a97c in non-virtual thunk to QCocoaWindow::devicePixelRatio() const ()
#2	0x000000010625a97b in non-virtual thunk to QCocoaWindow::devicePixelRatio() const ()
#3	0x000000010303dea3 in QWindow::devicePixelRatio() const at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtbase/src/gui/kernel/qwindow.cpp:1334
#4	0x00000001043af78f in QQuickWindow::effectiveDevicePixelRatio() const [inlined] ()
#5	0x00000001043af764 in QQuickWindowPrivate::syncSceneGraph() at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtdeclarative/src/quick/items/qquickwindow.cpp:531
#6	0x00000001043af763 in QQuickWindowPrivate::syncSceneGraph() at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtdeclarative/src/quick/items/qquickwindow.cpp:531
#7	0x0000000104539ddf in QSGRenderThread::sync(bool) at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtdeclarative/src/quick/scenegraph/qsgthreadedrenderloop.cpp:550
#8	0x000000010453a177 in QSGRenderThread::syncAndRender() at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtdeclarative/src/quick/scenegraph/qsgthreadedrenderloop.cpp:688
#9	0x000000010453b1a7 in QSGRenderThread::run() at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtdeclarative/src/quick/scenegraph/qsgthreadedrenderloop.cpp:938
#10	0x000000010664c3a3 in QThreadPrivate::start(void*)::$_0::operator()() const [inlined] at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtbase/src/corelib/thread/qthread_unix.cpp:321
#11	0x000000010664c2a4 in void (anonymous namespace)::terminate_on_exception<QThreadPrivate::start(void*)::$_0>(QThreadPrivate::start(void*)::$_0&&) [inlined] at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtbase/src/corelib/thread/qthread_unix.cpp:257
#12	0x000000010664c2a4 in QThreadPrivate::start(void*) at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtbase/src/corelib/thread/qthread_unix.cpp:280
#13	0x000000010664c2a3 in QThreadPrivate::start(void*) at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtbase/src/corelib/thread/qthread_unix.cpp:278
#14	0x000000010664c2a3 in QThreadPrivate::start(void*) at /Users/sergei.nevdakh/Qt/6.5.1.universal/qt_src_6.5.1/qtbase/src/corelib/thread/qthread_unix.cpp:278
#15	0x00000001024f955b in _pthread_start ()

      Attachments

        1. Screenshot 2023-05-26 at 16.58.51.png
          825 kB
          Michael Bruning
        2. WebEngineProfileUiThread.zip
          2 kB
          Michael Bruning

        Issue Links

          clones

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-113973 [macOS] QQuickWebEngineProfile::defaultProfile() in main thread causes runtime warning "This method should not be called on the main thread as it may lead to UI unresponsiveness."

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          duplicates

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-97518 Mac, Metal RHI - runtime warnings "UI API called from background thread".

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-117366 macOS: QQuickWindow calls into UI from render thread

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-115093 [macOS] [NSView convertSizeToBacking:] must be used from main thread only

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-64431 Investigate iOS/macOS main thread checker violations

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open
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              qt.team.graphics.and.multimedia Qt Graphics Team
              mibrunin Michael Bruning
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              Dates

                Created:
                Updated:
                Resolved:

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