It will support frame pointers, but they might be a bit less useful than when debugging C, because Kitten guarantees tail-call optimisation. The ABI is fairly similar (not fully worked out yet), just a couple of register differences to separate the data stack from the call stack.
I’m still working out Kitten’s story for concurrency and parallelism. You’ll be able to easily spin up an OS thread if you want one, but I expect most code to use other approaches, like a green-thread library.
In any case, I'm happy to hear Kitten will be usable with DTrace and gdb/lldb, even with some caveats! Too few languages nowadays support dynamic analysis or post-mortem, which dramatically reduce their usefulness for industry. :)
I agree that binary debugging support is a must. I’m trying generally to make the language a “good citizen” when it comes to interop—we’ll see how it turns out. :P