@gwr The `::stacks` dcmd is already incapable of walking stacks that jump from
one region of memory to another. I know some of the other stack-walking
implementations in the OS are more sophisticated, but this has a single buffer
(one thread's stack) in which it looks, and it bails as soon as it comes across
an address which doesn't fall within that buffer:
```
if (fp < kbase || fp >= (ktop - sizeof (struct rwindow)))
break;
```
I guess the question is: can a stack hop around, rather than growing in a
uniform direction, within the single fixed window that `crawl()` is examining?
I couldn't think of any scenarios where it could, which is why I didn't bother
using a more sophisticated cycle detection algorithm. If I overlooked
something, though, please let me know.
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