Whoops, mistook our Atomic as something which can wrap anything in a mutex automagically like std::mutex. I'll push up a proper version on monday. In the meantime, it appears that Bug 1607712 is essentially a dupe, in that it's another race on this same field, but when using Basic Compositor instead of Webrender.
Bug 1656266 Comment 11 Edit History
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Whoops, mistook our Atomic as something which can wrap anything in a mutex automagically like std::atomic. I'll push up a proper version on monday. In the meantime, it appears that Bug 1607712 is essentially a dupe, in that it's another race on this same field, but when using Basic Compositor instead of Webrender.