Bug 291677 – Memory Exceedance and Page Reload During WASM Compilation in WebGL Games on iOS 18.4

• Component: WebAssembly
• Status: RESOLVED DUPLICATE

[Ocean]

Created attachment 474942 [details]
crashed Html page and the corresponding WASM file

Description：
    We are encountering an issue where our WebGL-based games, built using Unity and exported as WASM, experience a page reload during the WASM compilation phase upon game launch. 

Steps to Reproduce:
    The attachment provides a web page and the corresponding loaded WASM file(200,000 empty functions), hosted by http server, opened by Safari browser 18.4.

Actual Results: 
    The page fails to load properly, and the console logs show memory exceeded errors. The console.app logs indicate memory exceeding the threshold, specifically showing:
memorystatus: killing_highwater_process pid 4738 [com.apple.WebKit.WebContent] (highwater 100 3s rf:-) 2025555KB - memorystatus_available_pages: 92254 compressor_size:21112
    
Additional Builds and Platforms:
   This issue is observed on various iOS devices (iPhone 11, iPhone 13, iPhone SE3) upgraded to iOS 18.4. (No crash occurs before iOS 18.4)

Our Analyze：
    Upon analyzing the issue, we identified that the problem does not occur on iOS 18.3 or earlier versions. Further investigation using the WebKit GitHub repository revealed that a specific commit might be causing the memory spike. By commenting out the relevant code section, the memory peak issue was resolved.
LLIntGenerator: :LLIntGenerator(...)
{
    m_codeBlock->m_callees = FixedBitVector(m_info.internalFunctionCount ()) ;
}
IPIntGenerator:: IPIntGenerator ()
{
    m_metadata->m_callees = FixedBitVector(m_info.internalFunctionCount ());
}
The commit  of the issue  probably  is https://github.com/WebKit/WebKit/commit/e9ced931afc738c9413a26562ad2dd1d7fec4cd2


This issue has affected many of our games, and there is a lot of feedback in the game engine community(https://discussions.unity.com/t/webgl-is-not-working-on-safari-after-ios-18-4-update/1628007,   https://discussions.unity.com/t/webgl-random-crashes-on-ios-18-works-fine-on-ios-18/1627624). 
Please help with analysis. Thanks in advance.

[Ocean]

Created attachment 474943 [details]
webkit_before_commit

[Ocean]

Created attachment 474944 [details]
webkit_after_commit

[Ocean]

Created attachment 474945 [details]
webkit_recently, peak memory of Compile Memory

[Ocean]

Created attachment 474947 [details]
game_sample(130K functions)

[Sihui Liu]

Fixed in https://bugs.webkit.org/show_bug.cgi?id=291699.

*** This bug has been marked as a duplicate of bug 291699 ***

[Myrindy]

Any update on this issue? Seems like it was wrongly assigned as a duplicate.

Hi there 
i still have this issue on IOS 18.4
is there any update for this ?