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  1. Qt
  2. QTBUG-80859

SIGSEGV during QWidgetBackingStore::qt_flush() via xcbSourceDispatch()

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    • Linux/X11
    • e2f35fa6842508f6bd9d2343f08a17a2a292fd71 (qt/qtbase/5.12.7)

      Apologies that I do not have minimal repro program or other details. This crash has been plaguing us every since we upgraded to 5.12.2 (from 5.4.1), and I haven't been able to figure out a repro for it yet.

      I wanted to share the stack trace just in case anyone had seen anything similar or may have any pointers on possible culprits

      
{\{QWidgetBackingStore::qt_flush() }}
 \{{QWidgetBackingStore::flush() }}
 \{{QWidgetBackingStore::doSync() }}
 \{{QWidget::event() }}
 \{{QApplicationPrivate::notify_helper() }}
 \{{QApplication::notify() }}
 \{{QCoreApplication::sendEvent() }}
 \{{QWidgetBackingStore::sendUpdateRequest() }}
 \{{QWidgetBackingStore::markDirty() }}
 \{{QWidgetWindow::repaintWindow() }}
 \{{QMetaObject::activate() }}
 \{{QWindowPrivate::emitScreenChangedRecursion() }}
 \{{QWindowPrivate::setTopLevelScreen() }}
 \{{QGuiApplicationPrivate::processWindowSystemEvent() }}
 \{{QWindowSystemInterface::sendWindowSystemEvents() }}
 \{{xcbSourceDispatch() }}
 \{{g_main_context_iterate.llvm.1369312655442132882 }}
 \{{QEventDispatcherGlib::processEvents() }}
 \{{QEventLoop::exec() }}
 \{{QCoreApplication::exec() }}
 \{{main }}
 \{{__libc_start_main }}

 

      It's a linux desktop application. Sometimes the crashes seem correlated when the application opens up multiple windows / dialogs, though it doesn't seem to be 100% and definitely doesn't reproduce consistently.

        1. QTBUG-80859-test1.tar.gz
          1 kB
          Liang Qi
        2. QTBUG-80859-test2.tar.gz
          1 kB
          Liang Qi
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            liaqi Liang Qi
            mbjorge Michael Bjorge
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