TASK-214337 debug code

[balupillai]

Note

High Risk
Touches core GC/heap management paths by adding frequent integrity checks and changing the ordering of deferred finalization, which could impact performance and GC behavior. New hard abort()s on detected corruption can crash production if checks fire (including due to false positives).

Overview
Adds a heap integrity validation layer for the GC object TAILQ, including pointer/type/owner checks and detailed crash logging via tailq_abort().

Wires these validations into hot GC/heap mutation points: object allocation (new_obj), thread heap transfer (luaC_inherit_thread), local GC phases (local_collection at multiple checkpoints), and global tracing (trace_heap). It also reorders finalize_deferred() to run while the collector is still blocked, with extra validation before/after finalization and deferred frees.

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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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[cursor]

✅ 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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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 6 comments.

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