In 2 days we have observed in Crashlytics over 50 crashes related to PKDrawing.image with EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000210
So far all on iPads with A10, A12 and A13; 100% on iOS 17 (17.1.1, 17.2, 17.3) (while in others the percent of iOS 17 was around 60-80%).
Context: Images of the varying frame and scale resulting in screen resolution are being generated sequentially (in a background serial queue called almost one after another when requested), updating one CALayer.contents (and only after this update on Main Thread the next generation is allowed). One zoomable PKCanvasView is present on screen.
The crashing line in code:
let image = drawing.image(from: frame, scale: renderScale).cgImage
The questions:
- Is there anything that can be done apart from throttling generation?
- Can the circumstances of the crash be determined – are there any indications accessible in code before calling PKDrawing.image that app might crash?
The traces:
0
AGXMetalA12
AGX::BlitContext<AGX::G11::Encoders, AGX::G11::Classes, AGX::G11::ObjClasses>::copyTextureToBuffer(IOGPUMetalResource const*, unsigned long, unsigned long, unsigned long, AGXA12FamilyTexture*, unsigned int, unsigned int, MTLOrigin, MTLSize, unsigned long) + 96
9
PencilKit
PKDrawing.image(from:scale:) + 28
0
AGXMetalA13
<redacted> + 96
9
PencilKit
PKDrawing.image(from:scale:) + 28
0
AGXMetalA10
<redacted> + 72
9
PencilKit
$s9PencilKit9PKDrawingV5image4from5scaleSo7UIImageCSo6CGRectV_12CoreGraphics7CGFloatVtF + 24
