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9dbe008f13
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Critical analysis: symptom suppression vs root cause elimination
Assessment of current approach:
✅ Stability achieved (no SIGSEGV)
❌ Symptoms proliferating ([TLS_SLL_NEXT_INVALID], [FREELIST_INVALID], etc.)
❌ Root causes remain untouched (multiple defensive layers accumulating)
Warning Signs:
- [TLS_SLL_NEXT_INVALID]: Freelist corruption happening frequently
- refcount > 0 deferred releases: Memory accumulating
- [NORMALIZE_USERPTR]: Pointer conversion bugs widespread
Three Root Cause Hypotheses:
A. Freelist next corruption (slab_idx calculation? bounds?)
B. Pointer conversion inconsistency (user vs base mixing)
C. SuperSlab reuse leaving garbage (lifecycle issue)
Recommended Investigation Path:
1. Audit slab_index_for() calculation (potential off-by-one)
2. Add persistent prev/next validation to detect freelist corruption
3. Limit class 1 with forced base conversion (isolate userptr source)
Key Insight:
Current approach: Hide symptoms with layers of guards
Better approach: Find and fix root cause (1-3 line fix expected)
Risk Assessment:
- Current: Stability OK, but memory safety uncertain
- Long-term: Memory leak + efficiency degradation likely
- Urgency: Move to root cause investigation NOW
Timeline for root cause fix:
- Task 1: slab_index_for audit (1-2h)
- Task 2: freelist detection (1-2h)
- Task 3: pointer audit (1h)
- Final fix: (1-3 lines)
Philosophy:
Don't suppress symptoms forever. Find the disease.
🤖 Generated with Claude Code (https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-12-04 03:09:28 +09:00 |
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