[Webkit-unassigned] [Bug 229178] New: deref crash while running javascript iOS & macOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229178

            Bug ID: 229178
           Summary: deref crash while running javascript iOS & macOS
           Product: WebKit
           Version: Other
          Hardware: All
                OS: iOS 14
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jcaptanis at janison.com.au

Created attachment 435663

  --> https://bugs.webkit.org/attachment.cgi?id=435663&action=review

Crash

I am seeing this crash while intercepting a request inside of a ServiceWorker that consequently performs a XmlhttpRequest, does some scrypto, then attempts to access indexdb. It happens at the same place everytime on both macOS (big sur) & iOS (14+). I cant create a minimal repo, seems to only happen when a combination of these servicices is put until real-world load.

I am using WkWebView via Xamarin and have opened up an associated issue here: https://github.com/xamarin/xamarin-macios/issues/12391

The same code does not crash on chrome webkit. If this is indicatite of a problem with my javascript code, could i please get pointers/documentation on what performant JS may look like when attempting to do resource intensive things like in app, e2e encryption. We use ServiceWorker extensively to offload compute.

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