I'm getting a lot of crashes in EAGLContext presentRenderbuffer on iOS 11, but only on iPhone 6/6+ and older.
As per this post, I think we've already ruled out VBO-related problems by rewriting everything to not use VBO/VAOs, but the crash wasn't fixed by that.
There are a few other questions on SO about this but no solution -- has anyone else been seeing the uptick in this crash and been able to resolve it?
TL;DR:
Here is what we know so far:
- The crash is specific to iOS11, iPhone 5S/6/6+. It doesn’t occur on 6S and up.
- The core of the OpenGL stack returns gpus_ReturnGuiltyForHardwareRestart
- It occurs when we attempt to invoke [EAGLContext presentRenderbuffer] from a CAEAGLLayer
- We don’t have a repro.
What we have tried so far:
- Remove any reference to VBO/VAO in our rendering stack. Didn’t help.
- We have tried reproing with a large range of drawing scenarios (rotation, resize, background/foreground). No luck.
- As far as we can tell, there is nothing specific in our application logic between the iPhone 6 family and the iPhone 6S family.
Some clues (that could be relevant but not necessarily):
- We know that when the presentRenderBuffer is invoked off main thread, and some CATransaction are occurring at the same time on the main thread, the crash rate goes up.
- When presentRenderBuffer is invoked on main thread (along with the whole drawing pipeline), the crash rate goes slightly down but not drastically.
- A substantial chunk (~20%) of the crashes occurs when the layer goes off screen and/or gets out of the view hierarchy.
Here is the stack trace:
libGPUSupportMercury.dylib gpus_ReturnGuiltyForHardwareRestart 1 AGXGLDriver gldUpdateDispatch 2 libGPUSupportMercury.dylib gpusSubmitDataBuffers 3 AGXGLDriver gldUpdateDispatch 4 GLEngine gliPresentViewES_Exec 5 OpenGLES -[EAGLContext presentRenderbuffer:] 
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