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GC may have inconsistent view of stacktop with deferred references #118926
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- added a commit that references this issue
on Jul 9, 2024 - added a commit that references this issue
on Aug 7, 2024 hey @Fidget-Spinner is this good to close since the ref'd PRs are merged?
Yup
In #118450, Sam pointed out that GC can occur at any
Py_DECREF. With deferred references, we will need to traverse the object's stacks. The main problem is thatframe->stacktopmight not represent the true stacktop at a GC collection, becauseframe->stacktopis not set in between opcodes.This requires either scanning the entire stack (not just up to stacktop), or deferring GC to safe points.
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