GPU driver crash in iOS 18

Steps to reproduce

1. Build the OpenGL Window example (https://doc.qt.io/qt-5/qtgui-openglwindow-example.html) for iPadOS
2. Install it on iPad 7 running iPadOS 18.0 or later using Xcode
3. Run the app - It should work fine
4. Attempt to put it into split screen mode - The app will likely crash
   • This is shown in the OS freezing when dragging the 3 dots to use split screen
   • The app can also freeze if you manage to split screen this with a different app, then attempt to resize the screens
   • It might not always crash, but attempt this a few times and you should see the issue

Crash messages

There are two different messages observed in different tests:

ASSERT failure in QIOSContext: "swapBuffers on incomplete FBO", file /Users/qt/work/qt/qtbase/src/plugins/platforms/ios/qioscontext.mm, line 196

Terminating due to blacklisting by kernel driver

Notes

• Earlier versions of iOS were fine; the crashing began after upgrading to iOS 18
• The customer's 2 real apps are complex Qt Quick apps. Crashes have been observed when the QSGRenderThread calls the following functions:
  • QIOSContext::swapBuffers()
  • QOpenGLFunctions::glClear()

• This was reproducible on an iPad 7 (A10 Fusion chip) running iPadOS 18.1.1/18.2.
• This was not reproducible on an iPad Mini 6th Gen (A15 Bionic chip) running iPadOS 18.1.1, or an iPad Air 5th Gen (M1 chip) running iPadOS 18.2