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Many tests in the System.IO.Compression namespace are failing due to a lack of native-to-managed wrappers. We have 43 test failures in total because of this.
System.ExecutionEngineException : Attempting to JIT compile method '(wrapper native-to-managed) System.IO.Compression.DeflateStreamNative:UnmanagedRead (intptr,int,intptr)' while running with --aot-only. See http://docs.xamarin.com/ios/about/limitations for more information.
List of failures (too long for bugzilla):
Those methods need to be marked with a [MonoPInvokeCallback] attribute:
That fixed it.