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Replied In iOS 11 CFNework Crash - TCPIOConnection::_handleTLSEvent(nw_tls_context*, tls_handshake_message_t, void () block_pointer, bool)

Our situation is pretty much identical to yours. Check out this thread: https://forums.developer.apple.com/thread/95387

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Replied In CFNetwork Crash iOS 11

Seems like this crash was fixed in iOS 11.3

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Replied In CFNetwork Crash iOS 11

We are also exepriencing same crashes. My investigation makes me think, that the crash is happening in the background when the app is launched from suspended mode with Background Fetch.For some reason our crash doesn't appear in Xcode, but i have one from Fabric:https://gist.github.com/jarosan/25af589fea381a59f2c64f049ab69e7a

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Replied In CFNetwork crash

We also have a lot of CFNetwork related crashes:1. The one that happens most often for some reason doesn't appear in Xcode, but only in Fabric Crashlytics. But it's exactly the same as reported here: https://forums.developer.apple.com/thread/94924I've noticed that it happens in background during Background Fetch.2. Our second most popular CFNetwork crash is this one:https://gist.github.com/jarosan/af09485be31123bb6ebb9395ba9382f8