tberghammer added a comment. In ABI conforming code we will never have even 2 consecutive frames with the same CFA for all ABI I know about. In practice, 2 consecutive frame with the same CFA can happen (for hand written assembly and signal handling), but more then 2 is highly unlikely. In theory, arbitrary number of frames can have the same CFA if the code sets up a different stack for itself (in a different location) what we don't track, but it is just a hypothetical case.
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