[Webkit-unassigned] [Bug 233020] Safari freezes when receiving call on device with iOS 15.2 Beta

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233020

--- Comment #9 from James Howard <jameshoward at mac.com> ---
Youenn, Alexey, check out the sysdiagnose in FB9747389.

There are also simple repro steps. The big difference between my steps and Virginia's are that installed a Home Screen web app as opposed to running in Safari. For some reason, using a Home Screen web app makes it much easier to reproduce.

These steps are near 100% repro for me on an iPad Air running 15.2 beta 2:

Steps to reproduce:
1. Navigate to https://james-howard.github.io/samples/src/content/peerconnection/pc1/
2. Tap share button to add to home screen (must do this step, won't repro in Safari alone)
3. Open the new home screen link (will be a PWA)
4. Tap start, then call and verify you see two videos from your front camera
5. Receive an incoming FaceTime call
6. Tap the banner to bring up the fullscreen FaceTime UI
7. Decline the call to return to the web app

Results:
Web App will be frozen (cannot interact with it in any way).

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