When debugging a JIT frame sniffer, it would be handy to see if it worked or not. One way would be if the "frame" command printed the name of the unwinder that was used to determine the current frame.
You can turn on frame debugging now to get this information, since commit a154d838a70e96d888620c072e2d6ea8bdf044ca Author: Simon Marchi <simon.marchi@polymtl.ca> Date: Tue Jun 29 12:05:03 2021 -0400 gdb: add names to unwinders, add debug messages when looking for unwinder I'm going to close this since I think that's sufficient.