Hi MobileTen,
yeah, I agree with the crashing on the bg thread, but for 2nd I doubt it cause UI framework. I've made sure there's no UI call in the stack trace.
I'm just curious about https://developer.apple.com/videos/play/wwdc2017/706 on slide 142. frame 9 is throwing the block to .global(.background) to measure which the DispatchQueue is non labeled
ihsanbl
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