Well, it's an interesting problem but I'm not sure it totally qualifies as a bug.
Your sample file leads to infinite recursion, thus exploding the stack and leading to the crash. This makes GDB return 104806 stack frames (on my machine), which, well, is a lot. The hang you see is the time the plugin takes to process all the frames and populate the Call Stack tab.

There is an easy optimization that makes a part of the process quite a lot faster (in dbm_gdb.c:get_stack()), but it's still a tiny part of the overall time it takes, which is almost entirely taken building the Call Stack tab.
Not quite sure what can be done here apart making the whole thing a lot faster (not sure how), or make the population incremental (probably tricky in the current state, and not very practical for the user as the frames will be missing).

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