I have this exact Xcode crashing problem as well. In my case, I have a lot of security mechanisms blocking any unauthorized network activity. I had the choice of disabling functionality in Xcode, blindingly allowing the network activity to Github.com or completely blocking the network activity out to Github.com via Xcode. I chose to perform a network block on any automatic network activity to Github.com from Xcode until this bug is resolved with Crashed Thread: 15 Dispatch queue: DVTSourceControlGitXPCClient :: Proxy Completion Queue. Any Github.com activities can be done from the terminal any way, at least for my working purposes.
Since blocking all network activity from Xcode to github.com, Xcode has not crashed at all.
claybarttles
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