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GC may have inconsistent view of stacktop with deferred references #118926
Description
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 that frame->stacktop might not represent the true stacktop at a GC collection, because frame->stacktop is not set in between opcodes.
This requires either scanning the entire stack (not just up to stacktop), or deferring GC to safe points.
Activity
GH-118926: Better distinguish between pointer and arrays in interpret…
pythonGH-118926: Better distinguish between pointer and arrays in int…
pythonGH-118926: Better distinguish between pointer and arrays in int…
pythongh-118926: Spill deferred references to stack in cases generator
gh-118926: Spill deferred references to stack in cases generator (#12…
pythongh-118926: Spill deferred references to stack in cases generator (
JacobCoffee commentedon Oct 1, 2024
hey @Fidget-Spinner is this good to close since the ref'd PRs are merged?
Fidget-Spinner commentedon Oct 1, 2024
Yup