TASK-214337 debug code

[balupillai]

Note

Medium Risk
Adds frequent heap validation and abort() on suspected corruption during GC, thread inheritance, and global tracing; this can impact performance and may terminate processes if the checks false-positive or trigger in production.

Overview
Adds aggressive heap-integrity validation to GC-critical code paths. Introduces validate_heap_objects() (plus basic bad-pointer/type/freed-bit checks) and calls it at multiple stages of local_collection(), before/after heap object transfer in luaC_inherit_thread(), and at the start of trace_heap().

Also moves deferred finalization (finalize_deferred()) to run before unblocking the collector during local GC, with additional validation checkpoints before/after reclaiming and freeing deferred objects.

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[Copilot]

Pull request overview

Adds new heap integrity validation to detect GC heap corruption and abort early, integrated into key GC lifecycle points and global tracing to surface memory/list corruption issues closer to their source.

Changes:

• Introduces validate_heap_objects(lua_State *L, const char *where) to walk L->heap->objects and validate node pointers/type/ownership, aborting on failure.
• Calls this validation before/after heap transfer in luaC_inherit_thread() and at multiple stages of local_collection().
• Adds basic corruption checks inside trace_heap() during global tracing.

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✅ Bugbot reviewed your changes and found no new issues!

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 4 comments.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 3 comments.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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