Add release notes for heap dependent finaliser use after free bug

ponylang · Oct 7, 2024 · b5635dd · b5635dd
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+## Fix use after free bug in actor heap finalisation that can lead to a segfault
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+The [0.45.2](https://github.com/ponylang/ponyc/releases/tag/0.45.2) release introduced an improvement to handling of objects with finalisers to make them more efficient to allocate on actor heaps. However, in the process it also introduced a potential for use after free situations that could lead to segfaults when running finalisers. With this change, we've reworked the implementation of the actor heap garbage collection to avoid the potential for use after free situations entirely.