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I've been working on an app that uses URLSession's dataTask to pull data from an FTP server. I know it's deprecated but unfortunately the only public API the system I'm working with offers is FTP-based. About once in every 150-200 connections I'll randomly get a EXC_BAD_ACCESS crash that seems to come from somewhere in CFNetwork. Hoping maybe someone can make more sense of it than I've been able to. The previous version of the app that I wrote for iOS 6 using NSURLConnection doesn't appear to have this problem. Crash Log