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DefineFieldNode owns an Identifier but inherited the arena allocation path that skips destructors. Register it as ParserArenaDeletable so its owning reference is released, with a refcount regression for all field types.
This was referenced Oct 9, 2026
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DefineFieldNodeowns anIdentifierbut inherited onlyParserArenaFreeable, so arena teardown skipped its destructor and lost the owning string reference. Registering it asParserArenaDeletablebalances that reference when the arena is destroyed. Live parser/identifier semantics and process-wide destructor policy stay unchanged. The recorded upstream searches found no matching owner fix in oven-sh/WebKit or WebKit/WebKit.The native regression checks public, private, and computed field nodes. An identifier's reference count goes 1→2→2 on the baseline and 1→2→1 with the fix;
JavaScriptCore_ParserArena.DefineFieldReleasesIdentifierpasses against the rebuilt engine. The allocation audit attributes 115 bytes across four allocations per Worker to these lost references.Integration qualification with openclaw/bun#153 rebased onto merged openclaw/bun#152 is complete. Both 1,000-Worker no-addon Linux LSan routes exit 0 using only the inherited console suppression; the separate known console remainder is 72 bytes/two allocations per global (oven-sh/bun#38395). The previously aborting addon-owned event-name case now delivers exactly one null-env callback on its creating thread under ASAN. Both platforms pass the complete 264-test N-API suite and the eight-finalizer/zero-fd fixture.
Matched 5,000-cycle OS RSS growth decreases from 9,408,512 to 6,930,432 bytes on Linux and from 16,154,624 to 11,173,888 bytes on macOS. Loaded-Worker timing improves on macOS; Linux changes are small and mixed across metrics and paired blocks, with no resolved directional change. Full numbers and the timing limitation are in openclaw/bun#153. No run was discarded or repeated to improve a result.
P2 review is scoped-clean, and this PR's exact-head engine checks are green. The parser fix is independently safe; the complete Worker-leak release also requires Bun oven-sh#153 after oven-sh#152. The development and release-line WebKit PRs target separate branches, with no ordering dependency between them. A matching engine artifact must be rebuilt and selected by Bun before advertising the complete fix. This PR remains unmerged and no artifact has been published.
Exact head:
9531a371207cfcaa837c0fc1febd62112bb07f91. Engine checks and ARM64 regressions are green.