Thanks for the reply. I recommend that you do what Jim suggested on that thread you referenced [1], namely file a bug. Please post your bug number, just for the record. I have immediately reported the bug. Here is the number. FB13382646 In terms of workarounds, if you modify your assert macro to not use abort but rather invoke __builtin_trap(), that seems to make LLDB much happier. I tried __builtin_trap. As a result, LLDB stopped when the app crashed. Thank you very much.