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want to reject zero PC followed by a normal>(non-signal/dummy) frame, for exactly this reason...
That sounds like a NULL pointer function call, which is what signull.exp is all about.
"followed" in the other direction. If we unwind a normal frame, and the next outer frame has a PC of zero, stop unwinding. We briefly had this check for "if the next frame is not the innermost frame" and that broke the equivalent of signull.exp; I think I proposed this in follow discussion to that.
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