[Webkit-unassigned] [Bug 217183] [iOS 14] Hang in -[WKUserDefaults _notifyObserversOfChangeFromValuesForKeys:toValuesForKeys:]

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217183

--- Comment #12 from Per Arne Vollan <pvollan at apple.com> ---
(In reply to Geoffrey Garen from comment #11)
> Given that the we don't know the upper limit of the hang, how do we know
> that dispatching to a secondary thread will resolve it?
> 
> Especially strange to hang in class_conformsToProtocol. That implies some
> kind of memory corruption in an Obj-C object or in the Obj-C runtime.

Yes, you are right. This patch only makes sure that we do not block Chrome’s main thread, making it unresponsive. The patch does not address why we seem to be stuck in conformsToProtocol for a substantial amount of time. At this point, the reason for this is unknown, and I have not been able to reproduce so far.

Thanks for reviewing!

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