[pull] master from ruby:master#198
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pull[bot] merged 8 commits intoturkdevops:masterfrom Aug 22, 2025
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[Bug #21548] In lazy sweeping, if we need to allocate an object in a heap where we weren't able to free any slots, but we also either have empty pages or could allocate new pages, then we want to preemptively claim a page because it's possible that sweeping another heap will call gc_sweep_finish_heap, which may use up all of the empty/allocatable pages. If other heaps are not finished sweeping then we do not finish this GC and we will end up triggering a new GC cycle during this GC phase.
Ideally we would do this lazily post optimization, but this is easier for now: we already have the requisite Snapshots available.
Not all ractor-related encoding issues were fixed by 1afc07e. I found more by running my test-all branch with 3 ractors for each test.
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