P1: Critical Description
QCocoaGLContext::makeCurrent(QPlatformSurface*) on the SGRenderThread results in a call to [NSOpenGLContext setView:] (from the render thread) which is not permitted and results in a deadlock.
This happens when building with Xcode 10 / SDK 10.14. Existing binaries built with Xcode 9 / SDK 10.13 and earlier are not affected.
Relevant stack traces:
thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP frame #0: 0x00007fff7992e1b2 libsystem_kernel.dylib`__psynch_cvwait + 10 frame #1: 0x0000000103fd9223 libsystem_pthread.dylib`_pthread_cond_wait + 724 frame #2: 0x0000000105549c7b QtCore`QWaitConditionPrivate::wait(unsigned long) + 75 frame #3: 0x0000000105549c12 QtCore`QWaitCondition::wait(QMutex*, unsigned long) + 162 frame #4: 0x00000001066081a9 QtQuick`QSGThreadedRenderLoop::polishAndSync(QSGThreadedRenderLoop::Window*, bool) + 1481 frame #5: 0x00000001066079bd QtQuick`QSGThreadedRenderLoop::handleExposure(QQuickWindow*) + 1117 frame #6: 0x00000001066074f9 QtQuick`QSGThreadedRenderLoop::exposureChanged(QQuickWindow*) + 281 frame #7: 0x0000000105b10df1 QtGui`QWindow::event(QEvent*) + 817 frame #8: 0x0000000106660b47 QtQuick`QQuickWindow::event(QEvent*) + 263 frame #9: 0x0000000106ac1f12 QtWidgets`QApplicationPrivate::notify_helper(QObject*, QEvent*) + 306 frame #10: 0x0000000106ac32ed QtWidgets`QApplication::notify(QObject*, QEvent*) + 573
thread #72, name = 'QSGRenderThread' frame #0: 0x00007fff7992e1b2 libsystem_kernel.dylib`__psynch_cvwait + 10 frame #1: 0x0000000103fd9223 libsystem_pthread.dylib`_pthread_cond_wait + 724 frame #2: 0x0000000105549c7b QtCore`QWaitConditionPrivate::wait(unsigned long) + 75 frame #3: 0x0000000105549c12 QtCore`QWaitCondition::wait(QMutex*, unsigned long) + 162 frame #4: 0x0000000105ae536f QtGui`QWindowSystemInterface::flushWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 655 frame #5: 0x0000000105ae50c4 QtGui`bool QWindowSystemInterfacePrivate::handleWindowSystemEvent<QWindowSystemInterface::SynchronousDelivery>(QWindowSystemInterfacePrivate::WindowSystemEvent*) + 180 frame #6: 0x0000000105aeb4a0 QtGui`void QWindowSystemInterface::handleExposeEvent<QWindowSystemInterface::SynchronousDelivery>(QWindow*, QRegion const&) + 192 frame #7: 0x000000010e399af8 libqcocoa_debug.dylib`QCocoaWindow::handleExposeEvent(QRegion const&) + 904 frame #8: 0x000000010e3a74bb libqcocoa_debug.dylib`-[QNSView updateRegion:] + 635 frame #9: 0x000000010e3a71ec libqcocoa_debug.dylib`-[QNSView drawRect:] + 860 frame #10: 0x00007fff49d41e28 AppKit`-[_NSOpenGLViewBackingLayer display] + 640 frame #11: 0x00007fff57535568 QuartzCore`CA::Layer::display_if_needed(CA::Transaction*) + 634 frame #12: 0x00007fff575237b7 QuartzCore`CA::Context::commit_transaction(CA::Transaction*) + 319 frame #13: 0x00007fff57523088 QuartzCore`CA::Transaction::commit() + 576 frame #14: 0x00007fff496129c4 AppKit`NSPerformVisuallyAtomicChange + 154 frame #15: 0x00007fff499947ad AppKit`-[NSOpenGLContext setView:] + 99 frame #16: 0x000000010e3a688f libqcocoa_debug.dylib`-[QNSView setQCocoaGLContext:] + 79 frame #17: 0x000000010e3f52cd libqcocoa_debug.dylib`QCocoaGLContext::setActiveWindow(QWindow*) + 445 frame #18: 0x000000010e3f5410 libqcocoa_debug.dylib`QCocoaGLContext::makeCurrent(QPlatformSurface*) + 304
Attachments
Issue Links
- relates to
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QTBUG-122259 [Mac OS] How to build Qt 5.15.11 with threaded opengl support
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- Open
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