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GH-100964: Fix reference cycle in exhausted generator frames#141112
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awaiting core reviewneeds backport to 3.13bugs and security fixes needs backport to 3.14bugs and security fixes
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So after spelunking here it appears that the issue here is that we can't clear
frame->previousafter_PyFrame_ClearExceptCodeinclear_gen_framebecause_PyFrame_ClearExceptCodecallstake_ownershipwhich copies the frame with a stalepreviouspointer. This makesf_backpoint to the caller, instead ofNone.