Taken from https://bugzilla.xamarin.com/show_bug.cgi?id=32714#c0:
Right now we're only able to provide unwound stack traces on API 16+ devices, and it could be helpful when debugging certain failures to provide an opt-in way of getting this information. Is it possible to either include libcorkscrew with the runtime for API 15 devices, or provide some other codepath that works on those devices to produce stack traces?
What we will likely do, if anything, is bundle libunwind with XA. I don't know when we'll look into that though.
I am only trying to figure out the issue of a bug, and it's not even related to libunwind, so reassigning it to default.