Bug 256876 - Webkit crashes when pinch-to-zooming with 50MB allocated for compositing layers
Summary: Webkit crashes when pinch-to-zooming with 50MB allocated for compositing layers
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Compositing (show other bugs)
Version: Safari 16
Hardware: iPhone / iPad iOS 16
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2023-05-16 22:35 PDT by Tomas Brambora
Modified: 2023-05-17 09:40 PDT (History)
3 users (show)

See Also:

Attachments
crash video (367.96 KB, video/mp4)
2023-05-16 22:35 PDT, Tomas Brambora 		no flags Details
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Description Tomas Brambora 2023-05-16 22:35:45 PDT 
Created attachment 466376 [details]
crash video

Pinch to zoom reliably crashes webkit process running the tiny react app available here: https://prismatic-pudding-dceafa.netlify.app/ even when the memory allocated to compositing layers is ~50MB only.

Each red rectangle is an absolutely positioned 1000px div with `will-change: transform` CSS rule, scaled down to 0.01 with a CSS scale transform.

The app crashes quite reliably when pinching to zoom on my iPhone 13 running iOS 16.1 even with only 3 divs rendered (which according to WebInspector allocates roughly 50MB for compositing layers).

When allocating 400+MB the app crashes immediately (i.e., just by adding the divs using the slider, without any zooming).
Comment 1 Radar WebKit Bug Importer 2023-05-17 09:39:24 PDT 
<rdar://problem/109464112>
Comment 2 Simon Fraser (smfr) 2023-05-17 09:40:55 PDT 
"scaled down to 0.01 with a CSS scale transform"

That's not ideal. It makes this related to 27684.