[Webkit-unassigned] [Bug 174656] RTCPeerConnection rollback rejects with InvalidStateError

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174656

Dominik Menke <dom at digineo.de> changed:

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                 CC|                            |dom at digineo.de

--- Comment #6 from Dominik Menke <dom at digineo.de> ---
(sorry for hijacking this)

There's an example Rails application which deploys some workarounds for Safari:

    https://github.com/domchristie/webrtc-hotwire-rails

The commit introducing support for Safari seems to be this one:

    https://github.com/domchristie/webrtc-hotwire-rails/commit/2b845c1

However, with the recent iOS 14.5 update, Mobile Safari 14.1 now (sometimes) fails to negotiate a connection. The error I'm seeing in the Devtools when calling pc.setRemoteDescription(offer) is:

    InvalidStateError: Description type incompatible with current signaling state

(pc.signalingState is "have-local-offer").

I've opened an issue within the webrtc-hotwire-rails to gather more information, including a repro steps:

    https://github.com/domchristie/webrtc-hotwire-rails/issues/1

I suspect changeset 266511 (for Technology Preview 114) might be responsible for surfacing this issue:

    https://trac.webkit.org/changeset/266511/webkit/

Currently, only iOS Safari seems to be affected, I could not reproduce it with the macOS version.

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