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gh-143807: Fix JIT executor overflow caused by large backoff values #143812
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gh-143807: Fix JIT executor overflow caused by large backoff values #143812
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devdanzin
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Jan 13, 2026
Is the change to JUMP_BACKWARD_INITIAL_VALUE from 4000 to 63 intended? I only use the smaller value because it makes crashing the JIT easier.
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Fidget-Spinner
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Jan 13, 2026
Sorry but this fix doesn't seem right. The problem isn't with the warmup/backoff values.
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This PR fixes a JIT crash where executor table size could exceed
MAX_EXECUTORS_SIZE due to excessively large initial backoff values.
Reducing the initial values for backward jumps and side exits keeps
executor growth bounded while preserving existing cooldown and tracing
heuristics.
Fixes gh-143807.
📚 Documentation preview 📚: https://cpython-previews--143812.org.readthedocs.build/