TASK-214337 debug code

[balupillai]

Note

Medium Risk
Touches core GC and thread-heap transfer paths by adding pervasive heap validation and hard aborts on detected corruption, which could impact performance or trigger crashes if the checks misfire. The change is diagnostic-focused and doesn’t alter reclamation semantics beyond moving finalize_deferred() earlier while still under collector block.

Overview
Adds heap corruption diagnostics to the GC by introducing validate_heap_objects()/tailq_abort() and calling them at key points in object allocation (new_obj), thread heap inheritance (luaC_inherit_thread), local GC phases (local_collection), and global heap tracing (trace_heap).

The new checks validate TailQ link integrity, object type/flags, and heap ownership, and emit detailed crash logs before abort() when corruption is detected. Also reorders local GC to run finalize_deferred() before unblocking the collector and adds additional validation checkpoints around reclaim/free phases.

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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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