Bug 228990 – Local debug build of WebContent crashes on launch in iOS simulator under performJITMemcpy

• Component: JavaScriptCore
• Status: RESOLVED DUPLICATE

[Alex Fioletov]

Created attachment 435331 [details]
Error in Xcode

I was trying to debug webkit with IOS simulator, but it crashes on start.
I followed instructions from this article. https://engineering.salesforce.com/debugging-webkit-in-hybrid-mobile-apps-2eee63a4c922.
Xcode attaches to all required processes, but before initial page from bundle is rendered, com.apple.WebKit.WebContnet process fails with EXC_BAD_ACCESS (Code=2).

- MacBook Air (M1, 2020)
- macOS Big Sur 11.5
- Xcode 12.5.1
- Simulators with iOS 14.5
- WebKit's master branch
- Test application: https://github.com/mmafrar/swift-ios-wkwebview-demo

I execute following commons to get sources and build them:

git clone git://git.webkit.org/WebKit.git WebKit 
cd WebKit
sudo Tools/Scripts/configure-xcode-for-embedded-development
./Tools/Scripts/update-webkit
Tools/Scripts/build-webkit --ios-simulator

Then I selected WebKit scheme, change paths to relative and selected test application to run. Before first page is rendered, process crashes.
The same scenario works for others with MacBook on inte

[Jonathan Bedard]

It's the M1 part of this that's the problem. You might be able to work-around it by running everything with Rosetta in the mean time, though.

[Alexey Proskuryakov]

rdar://77494871

[Yusuke Suzuki]

Oops! I've opened a new bug 230920 for uploading the patch, but that will be fixed with that patch soon :) Thanks for your reporting!

*** This bug has been marked as a duplicate of bug 230920 ***