During review of what became bugfix commit 173cf85a, Claude Code found an unrelated bug in hash index bucket splits.
Attached bug fix patch adds an isolation test demonstrating the problem; with the fix itself reverted, running the Claude-authored test shows a buffer pin leak. The leak is caused by _hash_finish_split neglecting to release a pin on the primary bucket buffer in its failure paths, used when a cleanup lock cannot be acquired. The fix just has _hash_finish_split release the pin in those paths. I doubt that it's worth committing the test itself. It'll add test cycles for a trivial issue, that's unlikely to ever regress in the future. -- Peter Geoghegan
v1-0001-Fix-hash-bucket-split-buffer-pin-leak.patch
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