NEW 279637
[iOS 18.1 Beta] WebKit crashes when visiting heavy page 
https://bugs.webkit.org/show_bug.cgi?id=279637
Summary [iOS 18.1 Beta] WebKit crashes when visiting heavy page
Dazhen Pan
Reported 2024-09-12 18:23:31 PDT
1. Visit https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-9/ which is a rather long page. 2. Safari will try to load it twice then display "A problem repeatedly occurred on". This is on iPhone 15 Pro Max iOS 18.1 Note if I restart the phone, then this doesn't happen any more, but will repro again if phone is used for a while.
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Radar WebKit Bug Importer
Comment 1 2024-09-19 18:24:14 PDT
<rdar://problem/136330950>
Ryan Reno
Comment 2 2024-09-20 12:53:24 PDT
I was able to reproduce on my phone as well. This is a highwater jetsam which can occur when the WebContent process crosses a soft limit and the system needs memory due to memory pressure. This is why the crash doesn't reproduce every time; the system won't kill the process if it doesn't need the memory. From an initial look it seems like it might be due to a high amount of graphics memory being allocated, usually to back compositing layers in the page. I'll try to get allocation logs to see what is prompting a large peak memory footprint. Thank you for the report.
bracho
Comment 3 2025-02-16 14:03:58 PST
Any updates here? Since last week are the crashes coming more often.
Simon Fraser (smfr)
Comment 4 2025-02-17 10:36:34 PST
It's notable that the <html> is composited separately from the main document, and it uses a lot of memory. This might be triggered by a negative z-index somewhere. Is tile coverage working as expected for this layer? It's also notable that each <pre> seems to take some memory even when outside the viewport, which is worth investigating.
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