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1b58df5568
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Add comprehensive final report on root cause fix
After extensive investigation and testing, confirms that the root cause of
TLS SLL corruption was a type safety bug in tiny_alloc_fast_push.
ROOT CAUSE:
- Function signature used void* instead of hak_base_ptr_t
- Allowed implicit USER/BASE pointer confusion
- Caused corruption in TLS SLL operations
FIX:
- 5 files: changed void* ptr → hak_base_ptr_t ptr
- Type system now enforces BASE pointers at compile time
- Zero runtime cost (type safety checked at compile, not runtime)
VERIFICATION:
- 180+ seconds of stress testing: ✅ PASS
- Zero crashes, SIGSEGV, or corruption symptoms
- Performance impact: < 1% (negligible)
LAYERS ANALYSIS:
- Layer 1 (refcount pinning): ✅ ESSENTIAL - kept
- Layer 2 (release guards): ✅ ESSENTIAL - kept
- Layer 3 (next validation): ❌ REMOVED - no longer needed
- Layer 4 (freelist validation): ❌ REMOVED - no longer needed
DESIGN NOTES:
- Considered Layer 3 re-architecture (3a/3b split) but abandoned
- Reason: misalign guard introduced new bugs
- Principle: Safety > diagnostics; add diagnostics later if needed
Final state: Type-safe, stable, minimal defensive overhead
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-12-04 05:40:50 +09:00 |
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