This happens for me on Android emulator(didn't try real device) if I'm switching in and out of app a lot. It crashes with abort("mono_threads_platform_set_priority: unknown policy 3").
I'm assigning this to Henry since I think https://github.com/mono/mono/commit/fa41710fe0 caused this.
Since I think this is serious regression I'm setting target to C9 and High priority.
The PR for C9 is available at https://github.com/mono/mono/pull/4265 and the trello card at https://trello.com/c/3EVRl9iL/5-mono-fix-bug-51545
What are the next step to get it merged into C9?
It was merged into mono, now it's up to the XA team to bump mono.
I'm verifying this is fixed, since now it just prints message but not crash application, which is exactly what fix is supposted to do: https://cloud.githubusercontent.com/assets/774791/23031600/e0a86fe0-f471-11e6-8e7c-a2090a9e04c2.png