Initialize visited on copied interpreter frames#148140
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pablogsal wants to merge 1 commit intopython:mainfrom
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Initialize visited on copied interpreter frames#148140pablogsal wants to merge 1 commit intopython:mainfrom
pablogsal wants to merge 1 commit intopython:mainfrom
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_PyFrame_Copy() copied interpreter frames into generator and frame-object storage without initializing the visited byte. Incremental GC later reads frame->visited in mark_stacks() on non-start passes, so copied frames could expose an uninitialized value once they became live on a thread stack again. Reset visited when copying a frame so copied frames start with defined GC bookkeeping state. Preserve lltrace in Py_DEBUG builds.
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