# 100-Point QA Checklist for LLaMA.cpp-Style Inference

**Version:** 1.0.0
**Methodology:** Toyota Production System (TPS) + NASA/JPL Mission Assurance + Popperian Falsification
**Last Updated:** 2025-12-10

---

## Philosophical Foundation

### Popperian Nullification Approach

Each checklist item is formulated as a **falsifiable hypothesis** (H₀). Per Popper (1959), we cannot prove correctness—we can only fail to disprove it. Each test attempts to **nullify** the hypothesis. Survival of rigorous nullification attempts increases confidence but never provides certainty.

> "The criterion of the scientific status of a theory is its falsifiability, or refutability, or testability." — Karl Popper, *Conjectures and Refutations* (1963)

### Toyota Way Integration

Following the 14 principles of TPS (Liker, 2004):
- **Jidoka (自働化):** Build quality in; stop on defects
- **Genchi Genbutsu (現地現物):** Go see for yourself
- **Kaizen (改善):** Continuous improvement
- **Muda Elimination (無駄):** Eliminate waste in all forms

### NASA/JPL Mission Assurance

Per NASA-STD-8739.8 and JPL D-17868:
- Defense in depth
- Fault containment regions
- Formal verification where applicable
- Independent verification and validation (IV&V)

---

## Severity Classification

| Level | Description | Response |
|-------|-------------|----------|
| **S1** | Safety-critical / Data corruption | Immediate stop-the-line (Andon) |
| **S2** | Functional failure | Block release |
| **S3** | Performance degradation | Remediate before release |
| **S4** | Quality concern | Track for improvement |

---

## Section 1: Memory Safety (Items 1-15)

### H₀-001: No Use-After-Free in KV Cache [S1]
**Hypothesis:** The KV cache implementation contains no use-after-free vulnerabilities.
**Nullification Test:** Instrument with AddressSanitizer; execute 10,000 inference cycles with varying sequence lengths; attempt to trigger deallocation race conditions.
**Citation:** Serebryany et al. (2012), "AddressSanitizer: A Fast Address Sanity Checker"

```bash
RUSTFLAGS="-Z sanitizer=address" cargo test --target x86_64-unknown-linux-gnu
```

**Pass Criterion:** Zero ASan violations after 10,000 cycles.

---

### H₀-002: No Buffer Overflows in Tensor Operations [S1]
**Hypothesis:** All tensor operations respect allocated bounds.
**Nullification Test:** Fuzz tensor dimensions with arbitrary values; verify bounds checking prevents overflow.
**Citation:** Miller et al. (1990), "An Empirical Study of the Reliability of UNIX Utilities"

```rust
#[test]
fn fuzz_tensor_bounds() {
    for _ in 0..10000 {
        let rows = rand::random::<usize>() % 10000;
        let cols = rand::random::<usize>() % 10000;
        // Must not panic or overflow
    }
}
```

**Pass Criterion:** No panics, no undefined behavior.

---

### H₀-003: Memory Leak Freedom in Long-Running Inference [S2]
**Hypothesis:** Memory usage remains bounded during extended operation.
**Nullification Test:** Run continuous inference for 24 hours; measure RSS every minute; apply Mann-Kendall trend test.

**Pass Criterion:** No statistically significant upward trend (p > 0.05).

---

### H₀-004: Alignment Requirements Satisfied for SIMD [S2]
**Hypothesis:** All SIMD operations receive properly aligned data.
**Nullification Test:** Verify 32-byte alignment for AVX2, 16-byte for SSE; misaligned access must be detected.

```rust
assert!(ptr as usize % 32 == 0, "AVX2 requires 32-byte alignment");
```

**Pass Criterion:** Zero alignment faults under UBSan.

---

### H₀-005: mlock() Respects Resource Limits [S3]
**Hypothesis:** Memory pinning operations respect RLIMIT_MEMLOCK.
**Nullification Test:** Set ulimit -l to 64KB; attempt to lock 1MB; verify graceful degradation.

**Pass Criterion:** Returns `MlockResult::ResourceLimit`, does not crash.

---

### H₀-006: Double-Free Prevention [S1]
**Hypothesis:** No memory region is freed twice.
**Nullification Test:** Enable double-free detection; stress test Drop implementations.

**Pass Criterion:** Zero double-free reports.

---

### H₀-007: Stack Overflow Prevention in Recursive Operations [S1]
**Hypothesis:** Recursive token generation cannot exhaust stack.
**Nullification Test:** Generate 1M tokens; monitor stack depth.

**Pass Criterion:** Stack usage < 8MB throughout.

---

### H₀-008: Heap Fragmentation Bounded [S3]
**Hypothesis:** Long-running inference does not suffer unbounded fragmentation.
**Nullification Test:** Measure jemalloc fragmentation metrics over 10,000 batches.

**Pass Criterion:** Fragmentation ratio < 1.5x.

---

### H₀-009: Zero-Copy Semantics Preserved [S4]
**Hypothesis:** Safetensors loading performs zero unnecessary copies.
**Nullification Test:** Trace allocations during model load; count copy operations.

**Pass Criterion:** ≤1 copy per tensor (mmap → aligned buffer if needed).

---

### H₀-010: OOM Handling Graceful [S2]
**Hypothesis:** Out-of-memory conditions produce recoverable errors.
**Nullification Test:** Limit heap to 100MB; load 7B model; verify error propagation.

**Pass Criterion:** Returns `RealizarError::OutOfMemory`, no abort().

---

### H₀-011: Shared Memory Thread Safety [S1]
**Hypothesis:** All shared state is properly synchronized.
**Nullification Test:** Run ThreadSanitizer under maximum concurrency.
**Citation:** Serebryany & Iskhodzhanov (2009), "ThreadSanitizer"

**Pass Criterion:** Zero data races detected.

---

### H₀-012: GPU Memory Leak Freedom [S2]
**Hypothesis:** GPU memory is fully released on model unload.
**Nullification Test:** Load/unload model 100 times; measure VRAM before/after.

**Pass Criterion:** VRAM delta < 1MB.

---

### H₀-013: Memory Pool Exhaustion Handling [S2]
**Hypothesis:** Slab allocator exhaustion is handled gracefully.
**Nullification Test:** Exhaust KV cache pool; verify error propagation.

**Pass Criterion:** Returns appropriate error, no UB.

---

### H₀-014: Uninitialied Memory Never Read [S1]
**Hypothesis:** All memory is initialized before use.
**Nullification Test:** Run MemorySanitizer on full test suite.

**Pass Criterion:** Zero MSan violations.

---

### H₀-015: Virtual Memory Mapping Correctness [S2]
**Hypothesis:** mmap regions are unmapped on all exit paths.
**Nullification Test:** Verify munmap in Drop; test with early returns and panics.

**Pass Criterion:** No mapped regions leak on /proc/self/maps.

---

## Section 2: Numerical Accuracy (Items 16-30)

### H₀-016: Softmax Numerical Stability [S2]
**Hypothesis:** Softmax is numerically stable for extreme inputs.
**Nullification Test:** Input logits in range [-1000, 1000]; verify no NaN/Inf.
**Citation:** Goodfellow et al. (2016), "Deep Learning", Section 4.1

```rust
let extreme = vec![1000.0, -1000.0, 0.0];
let result = softmax(&extreme);
assert!(result.iter().all(|x| x.is_finite()));
```

**Pass Criterion:** All outputs finite; sum within [0.999, 1.001].

---

### H₀-017: LayerNorm Epsilon Prevents Division by Zero [S2]
**Hypothesis:** Layer normalization handles zero-variance inputs.
**Nullification Test:** Input constant vector; verify stable output.

**Pass Criterion:** No Inf/NaN; output is zero vector.

---

### H₀-018: RoPE Rotation Preserves Magnitude [S3]
**Hypothesis:** Rotary position embeddings preserve vector norms.
**Nullification Test:** Compare ||x|| before and after RoPE application.

**Pass Criterion:** |pre_norm - post_norm| / pre_norm < 1e-5.

---

### H₀-019: Attention Score Overflow Prevention [S2]
**Hypothesis:** QK^T / √d_k does not overflow float32 range.
**Nullification Test:** Set d_k = 1; use maximum float32 Q and K values.

**Pass Criterion:** No overflow; graceful saturation if needed.

---

### H₀-020: Q4_0 Dequantization Accuracy [S2]
**Hypothesis:** Q4_0 dequantization error is bounded.
**Nullification Test:** Quantize → dequantize; measure MSE vs original.
**Citation:** Dettmers et al. (2022), "LLM.int8(): 8-bit Matrix Multiplication"

**Pass Criterion:** MSE < 0.01 for normalized inputs.

---

### H₀-021: Q8_0 Dequantization Accuracy [S2]
**Hypothesis:** Q8_0 achieves near-lossless accuracy.
**Nullification Test:** Round-trip test; measure maximum absolute error.

**Pass Criterion:** Max error < 1e-3.

---

### H₀-022: MatMul Associativity Tolerance [S3]
**Hypothesis:** Matrix multiplication order does not cause excessive drift.
**Nullification Test:** Compare (AB)C vs A(BC); measure relative error.

**Pass Criterion:** Relative error < 1e-4 for float32.

---

### H₀-023: Gradient Accumulation Precision [S3]
**Hypothesis:** Kahan summation prevents catastrophic cancellation.
**Nullification Test:** Sum 1M small values; compare naive vs Kahan.

**Pass Criterion:** Kahan result within 1e-6 of arbitrary precision reference.

---

### H₀-024: GELU Approximation Error Bounded [S3]
**Hypothesis:** Tanh GELU approximation error is acceptable.
**Nullification Test:** Compare against exact GELU over [-10, 10].
**Citation:** Hendrycks & Gimpel (2016), "GELU"

**Pass Criterion:** Max absolute error < 1e-4.

---

### H₀-025: KL Divergence Non-Negative [S2]
**Hypothesis:** KL divergence computation never returns negative values.
**Nullification Test:** Fuzz with random probability distributions.

**Pass Criterion:** All results ≥ 0.

---

### H₀-026: Log Probability Computation Stable [S2]
**Hypothesis:** Log probabilities handle near-zero values.
**Nullification Test:** Input probabilities approaching f32::MIN_POSITIVE.

**Pass Criterion:** No -Inf unless probability is exactly 0.

---

### H₀-027: Temperature Scaling Correctness [S3]
**Hypothesis:** Temperature=1.0 produces unmodified distribution.
**Nullification Test:** Compare softmax(x) vs softmax(x/1.0).

**Pass Criterion:** Bit-exact equality.

---

### H₀-028: Top-K Sampling Distribution [S3]
**Hypothesis:** Top-K sampling produces correct truncated distribution.
**Nullification Test:** Sample 100K tokens; verify empirical distribution matches theory.
**Citation:** Fan et al. (2018), "Hierarchical Neural Story Generation"

**Pass Criterion:** Chi-squared test p > 0.05.

---

### H₀-029: Top-P (Nucleus) Sampling Correctness [S3]
**Hypothesis:** Top-P respects cumulative probability threshold.
**Nullification Test:** Verify sampled tokens always from nucleus set.

**Pass Criterion:** 100% of samples within nucleus.

---

### H₀-030: Float16/BFloat16 Conversion Accuracy [S3]
**Hypothesis:** FP16 ↔ FP32 conversions preserve reasonable precision.
**Nullification Test:** Round-trip test; measure maximum error.

**Pass Criterion:** Relative error < 1e-3 for normalized values.

---

## Section 3: Performance Guarantees (Items 31-45)

### H₀-031: TTFT Under Load [S2]
**Hypothesis:** Time-to-first-token < 100ms for cached model.
**Nullification Test:** Warm cache; measure TTFT over 1000 requests.
**Citation:** Dean & Barroso (2013), "The Tail at Scale"

**Pass Criterion:** p99 TTFT < 100ms.

---

### H₀-032: ITL Consistency [S3]
**Hypothesis:** Inter-token latency coefficient of variation < 20%.
**Nullification Test:** Generate 1000 tokens; compute CV of ITL.

**Pass Criterion:** CV < 0.20.

---

### H₀-033: Throughput Linear Scaling with Batch Size [S3]
**Hypothesis:** Doubling batch size approximately doubles throughput.
**Nullification Test:** Measure tok/s at batch sizes 1, 2, 4, 8, 16.

**Pass Criterion:** Scaling efficiency > 70% up to batch size 16.

---

### H₀-034: KV Cache Hit Rate [S3]
**Hypothesis:** Prefix caching achieves >90% hit rate for repeated prefixes.
**Nullification Test:** Submit 100 requests with common 50-token prefix.

**Pass Criterion:** Cache hit rate > 90%.

---

### H₀-035: Memory Bandwidth Utilization [S3]
**Hypothesis:** Memory bandwidth utilization > 60% during attention.
**Nullification Test:** Profile with perf; measure actual vs theoretical bandwidth.

**Pass Criterion:** Utilization > 60%.

---

### H₀-036: No Convoy Effect Under Load [S2]
**Hypothesis:** Long requests do not block short requests.
**Nullification Test:** Submit mixed 10-token and 1000-token requests; measure p99.

**Pass Criterion:** Short request p99 < 2x idle latency.

---

### H₀-037: Thermal Throttling Detection [S3]
**Hypothesis:** System detects and reports thermal throttling.
**Nullification Test:** Induce thermal load; verify warning emission.

**Pass Criterion:** Warning logged when CPU temp > 90°C.

---

### H₀-038: NUMA Awareness [S4]
**Hypothesis:** Tensors allocated on local NUMA node.
**Nullification Test:** Verify memory locality with numastat.

**Pass Criterion:** > 95% local memory access.

---

### H₀-039: Speculative Decoding Acceptance Rate [S3]
**Hypothesis:** Speculative decoding achieves >60% acceptance rate.
**Nullification Test:** Enable speculation; measure accepted/proposed ratio.

**Pass Criterion:** Acceptance rate > 60%.

---

### H₀-040: GPU Kernel Occupancy [S3]
**Hypothesis:** Attention kernels achieve >50% occupancy.
**Nullification Test:** Profile with nsight; measure SM occupancy.

**Pass Criterion:** Occupancy > 50%.

---

### H₀-041: Context Switch Overhead [S4]
**Hypothesis:** Request scheduling overhead < 1% of inference time.
**Nullification Test:** Measure time in scheduler vs total request time.

**Pass Criterion:** Overhead < 1%.

---

### H₀-042: Cold Start Latency [S3]
**Hypothesis:** Model load time < 30s for 7B model.
**Nullification Test:** Time from process start to first inference.

**Pass Criterion:** Cold start < 30s.

---

### H₀-043: Memory Pool Allocation Latency [S4]
**Hypothesis:** KV cache slot allocation < 1μs.
**Nullification Test:** Benchmark allocation under contention.

**Pass Criterion:** p99 allocation time < 1μs.

---

### H₀-044: Tokenization Throughput [S4]
**Hypothesis:** Tokenization > 1M tokens/sec.
**Nullification Test:** Benchmark BPE tokenizer with Wikipedia corpus.

**Pass Criterion:** Throughput > 1M tok/s.

---

### H₀-045: Continuous Batching Efficiency [S3]
**Hypothesis:** Continuous batching improves throughput >2x vs static.
**Nullification Test:** Compare throughput under mixed-length workload.
**Citation:** Yu et al. (2022), "Orca: A Distributed Serving System"

**Pass Criterion:** Throughput improvement > 2x.

---

## Section 4: Correctness & Determinism (Items 46-60)

### H₀-046: Greedy Decoding Determinism [S2]
**Hypothesis:** Greedy decoding produces identical output for identical input.
**Nullification Test:** Run same prompt 100 times; verify identical output.

**Pass Criterion:** 100% identical outputs.

---

### H₀-047: Seeded Sampling Reproducibility [S2]
**Hypothesis:** Same seed produces identical sampling sequence.
**Nullification Test:** Sample with seed=42 twice; compare outputs.

**Pass Criterion:** Bit-exact equality.

---

### H₀-048: Attention Mask Correctness [S1]
**Hypothesis:** Causal mask prevents attending to future tokens.
**Nullification Test:** Inject sentinel value at position i+1; verify position i unaffected.

**Pass Criterion:** Zero information leakage.

---

### H₀-049: Tokenizer Round-Trip [S2]
**Hypothesis:** encode(decode(tokens)) == tokens for valid sequences.
**Nullification Test:** Fuzz with random token sequences.

**Pass Criterion:** 100% round-trip success.

---

### H₀-050: EOS Handling [S2]
**Hypothesis:** Generation stops on EOS token.
**Nullification Test:** Verify generation halts when EOS sampled.

**Pass Criterion:** No tokens generated after EOS.

---

### H₀-051: Padding Token Ignored [S2]
**Hypothesis:** Padding tokens do not affect output.
**Nullification Test:** Compare output with/without padding; must be identical.

**Pass Criterion:** Bit-exact equality.

---

### H₀-052: Position ID Sequential [S2]
**Hypothesis:** Position IDs are assigned sequentially without gaps.
**Nullification Test:** Trace position IDs during generation.

**Pass Criterion:** IDs form contiguous sequence [0, 1, 2, ...].

---

### H₀-053: BOS Token Prepended [S2]
**Hypothesis:** BOS token automatically prepended when required.
**Nullification Test:** Encode text; verify first token is BOS.

**Pass Criterion:** tokens[0] == BOS_ID.

---

### H₀-054: UTF-8 Handling [S2]
**Hypothesis:** Unicode text correctly tokenized and decoded.
**Nullification Test:** Test with multilingual corpus (Chinese, Arabic, Emoji).
**Citation:** Unicode Consortium (2023), "Unicode Standard 15.1"

**Pass Criterion:** Zero encoding errors; valid UTF-8 output.

---

### H₀-055: Max Sequence Length Enforcement [S2]
**Hypothesis:** Generation stops at max_tokens limit.
**Nullification Test:** Set max_tokens=10; verify exactly 10 tokens generated.

**Pass Criterion:** len(output) == min(max_tokens, natural_length).

---

### H₀-056: Empty Input Handling [S2]
**Hypothesis:** Empty prompt produces valid (possibly empty) output.
**Nullification Test:** Submit empty string; verify no crash.

**Pass Criterion:** Returns valid response or appropriate error.

---

### H₀-057: Special Token Preservation [S2]
**Hypothesis:** Special tokens not split by tokenizer.
**Nullification Test:** Tokenize "[INST]"; verify single token.

**Pass Criterion:** Special tokens remain atomic.

---

### H₀-058: Chat Template Correctness [S2]
**Hypothesis:** Chat template produces expected format.
**Nullification Test:** Compare output against reference implementation.

**Pass Criterion:** Template output matches reference.

---

### H₀-059: Repetition Penalty Application [S3]
**Hypothesis:** Repetition penalty reduces repeated token probability.
**Nullification Test:** Compare logits with/without penalty for repeated token.

**Pass Criterion:** P(repeated) < P(original) * penalty_factor.

---

### H₀-060: Stop Sequence Handling [S2]
**Hypothesis:** Generation stops when stop sequence encountered.
**Nullification Test:** Set stop=["END"]; verify generation stops.

**Pass Criterion:** Output ends immediately before stop sequence.

---

## Section 5: Error Handling & Resilience (Items 61-75)

### H₀-061: Invalid Model File Rejection [S2]
**Hypothesis:** Corrupted GGUF files are detected and rejected.
**Nullification Test:** Flip random bits in GGUF; verify error returned.

**Pass Criterion:** Returns `RealizarError::InvalidFormat`.

---

### H₀-062: Version Mismatch Detection [S2]
**Hypothesis:** Unsupported GGUF versions produce clear error.
**Nullification Test:** Modify version field; verify error message.

**Pass Criterion:** Error mentions "unsupported version".

---

### H₀-063: Tensor Shape Validation [S2]
**Hypothesis:** Mismatched tensor shapes detected at load time.
**Nullification Test:** Modify tensor metadata to invalid shape.

**Pass Criterion:** Error during load, not during inference.

---

### H₀-064: Missing Tensor Handling [S2]
**Hypothesis:** Missing required tensors produce clear error.
**Nullification Test:** Remove attention weight tensor from file.

**Pass Criterion:** Error identifies missing tensor by name.

---

### H₀-065: Request Timeout Handling [S2]
**Hypothesis:** Long-running requests can be cancelled.
**Nullification Test:** Set timeout; verify cancellation honored.

**Pass Criterion:** Request cancelled within timeout + 100ms.

---

### H₀-066: Concurrent Request Isolation [S1]
**Hypothesis:** Request failures do not affect other requests.
**Nullification Test:** Inject fault in one request; verify others complete.
**Citation:** Gunawi et al. (2014), "What Bugs Live in the Cloud?"

**Pass Criterion:** 100% isolation; no cross-request impact.

---

### H₀-067: Graceful Degradation Under Memory Pressure [S2]
**Hypothesis:** System degrades gracefully when memory constrained.
**Nullification Test:** Limit memory; verify error rather than OOM kill.

**Pass Criterion:** Clean error response, no SIGKILL.

---

### H₀-068: Connection Drop Handling [S3]
**Hypothesis:** Client disconnect releases server resources.
**Nullification Test:** Open connection, disconnect; verify cleanup.

**Pass Criterion:** Resources freed within 5 seconds.

---

### H₀-069: Malformed JSON Rejection [S2]
**Hypothesis:** Invalid JSON produces helpful error message.
**Nullification Test:** Submit truncated JSON; verify error.

**Pass Criterion:** HTTP 400 with error details.

---

### H₀-070: Panic Recovery [S1]
**Hypothesis:** Panics in worker threads do not crash server.
**Nullification Test:** Inject panic; verify server remains operational.

**Pass Criterion:** Server continues serving other requests.

---

### H₀-071: Signal Handling [S2]
**Hypothesis:** SIGTERM triggers graceful shutdown.
**Nullification Test:** Send SIGTERM during inference; verify completion.

**Pass Criterion:** In-flight requests complete; clean exit.

---

### H₀-072: Disk Full Handling [S3]
**Hypothesis:** Audit log handles disk full gracefully.
**Nullification Test:** Fill disk; verify error propagation.

**Pass Criterion:** Error logged to stderr; service continues.

---

### H₀-073: Clock Skew Tolerance [S4]
**Hypothesis:** System tolerates clock adjustments.
**Nullification Test:** Adjust system clock backward; verify no errors.

**Pass Criterion:** No timestamp-related failures.

---

### H₀-074: Rate Limit Enforcement [S3]
**Hypothesis:** Excessive requests are rate-limited.
**Nullification Test:** Submit 10,000 requests/second; verify throttling.

**Pass Criterion:** HTTP 429 returned for excess requests.

---

### H₀-075: Health Check Under Load [S2]
**Hypothesis:** Health endpoint responds under maximum load.
**Nullification Test:** Saturate inference; verify /health responds.

**Pass Criterion:** Health check latency < 100ms under load.

---

## Section 6: Security (Items 76-85)

### H₀-076: No Path Traversal in Model Loading [S1]
**Hypothesis:** Path traversal attacks are prevented.
**Nullification Test:** Attempt to load "../../../etc/passwd".
**Citation:** OWASP (2021), "Path Traversal"

**Pass Criterion:** Request rejected; no file access.

---

### H₀-077: Input Length Validation [S1]
**Hypothesis:** Excessively long inputs are rejected.
**Nullification Test:** Submit 10MB prompt; verify rejection.

**Pass Criterion:** HTTP 413 returned; no OOM.

---

### H₀-078: No Command Injection [S1]
**Hypothesis:** User input never executed as commands.
**Nullification Test:** Include shell metacharacters in prompt.

**Pass Criterion:** Metacharacters treated as literal text.

---

### H₀-079: No Prompt Injection to System [S2]
**Hypothesis:** User prompts cannot escape to system context.
**Nullification Test:** Include "SYSTEM:" prefix in user message.

**Pass Criterion:** Treated as user content, not system.

---

### H₀-080: TLS Certificate Validation [S2]
**Hypothesis:** HTTPS connections validate certificates.
**Nullification Test:** Connect with invalid cert; verify rejection.

**Pass Criterion:** Connection refused for invalid certs.

---

### H₀-081: Secret Sanitization in Logs [S1]
**Hypothesis:** API keys never appear in logs.
**Nullification Test:** Submit request with API key; search logs.

**Pass Criterion:** No API keys in any log output.

---

### H₀-082: Memory Not Leaked Across Requests [S1]
**Hypothesis:** Previous request data not visible to subsequent requests.
**Nullification Test:** Check KV cache cleared between requests.

**Pass Criterion:** Zero cross-request data leakage.

---

### H₀-083: Denial of Service Resistance [S2]
**Hypothesis:** Malicious input cannot cause excessive resource usage.
**Nullification Test:** Submit adversarial prompts designed to maximize compute.

**Pass Criterion:** Resources bounded; no service degradation.

---

### H₀-084: Integer Overflow Prevention [S1]
**Hypothesis:** Integer operations cannot overflow to cause errors.
**Nullification Test:** Submit max-length sequences; verify bounds checks.

**Pass Criterion:** No integer overflow in size calculations.

---

### H₀-085: Audit Log Integrity [S2]
**Hypothesis:** Audit logs cannot be tampered with.
**Nullification Test:** Attempt to modify log entries; verify detection.

**Pass Criterion:** Tampering detected via checksums.

---

## Section 7: Observability (Items 86-95)

### H₀-086: Metrics Cardinality Bounded [S3]
**Hypothesis:** Metric label cardinality does not grow unbounded.
**Nullification Test:** Submit 10,000 unique prompts; count metric series.
**Citation:** Prometheus Best Practices (2023)

**Pass Criterion:** Metric series < 10,000.

---

### H₀-087: Latency Histogram Accuracy [S3]
**Hypothesis:** Histogram buckets accurately reflect latency distribution.
**Nullification Test:** Compare histogram to actual latency measurements.

**Pass Criterion:** Error < 5% for each percentile.

---

### H₀-088: Trace Context Propagation [S4]
**Hypothesis:** Trace IDs propagate through entire request lifecycle.
**Nullification Test:** Submit traced request; verify span linkage.

**Pass Criterion:** Complete trace from ingress to response.

---

### H₀-089: Error Rate Metric Accuracy [S3]
**Hypothesis:** Error rate metric matches actual error count.
**Nullification Test:** Inject N errors; verify metric shows N.

**Pass Criterion:** Metric matches actual count exactly.

---

### H₀-090: Memory Metric Accuracy [S3]
**Hypothesis:** Reported memory usage matches actual RSS.
**Nullification Test:** Compare metric to /proc/self/statm.

**Pass Criterion:** Error < 5%.

---

### H₀-091: Request Logging Completeness [S3]
**Hypothesis:** All requests are logged with required fields.
**Nullification Test:** Submit request; verify log contains required fields.

**Pass Criterion:** All fields present: timestamp, latency, status, tokens.

---

### H₀-092: Health Check Liveness vs Readiness [S2]
**Hypothesis:** Liveness and readiness probes behave correctly.
**Nullification Test:** During model load: liveness=true, readiness=false.

**Pass Criterion:** Correct probe responses during all states.

---

### H₀-093: Profiling Overhead [S4]
**Hypothesis:** Profiling adds < 5% overhead.
**Nullification Test:** Compare latency with/without profiling enabled.

**Pass Criterion:** Overhead < 5%.

---

### H₀-094: Alert Threshold Correctness [S3]
**Hypothesis:** Alerts fire at configured thresholds.
**Nullification Test:** Induce metric at threshold; verify alert fires.

**Pass Criterion:** Alert fires within 1 scrape interval.

---

### H₀-095: Log Level Filtering [S4]
**Hypothesis:** Log level configuration is respected.
**Nullification Test:** Set level=ERROR; verify no DEBUG output.

**Pass Criterion:** Only ERROR and above in output.

---

## Section 8: API Compliance (Items 96-100)

### H₀-096: OpenAI API Compatibility [S2]
**Hypothesis:** /v1/completions endpoint matches OpenAI spec.
**Nullification Test:** Submit OpenAI-format request; verify response format.
**Citation:** OpenAI API Reference (2024)

**Pass Criterion:** Response validates against OpenAI schema.

---

### H₀-097: Streaming SSE Format [S2]
**Hypothesis:** Streaming responses follow SSE specification.
**Nullification Test:** Parse stream with standard SSE parser.

**Pass Criterion:** Valid SSE events; data: prefix correct.

---

### H₀-098: HTTP Status Codes [S3]
**Hypothesis:** HTTP status codes follow RFC 7231.
**Nullification Test:** Verify 400 for client error, 500 for server error.

**Pass Criterion:** Correct status codes for all error types.

---

### H₀-099: Content-Type Headers [S3]
**Hypothesis:** Responses include correct Content-Type.
**Nullification Test:** Verify application/json for JSON responses.

**Pass Criterion:** Correct Content-Type on all responses.

---

### H₀-100: CORS Headers [S3]
**Hypothesis:** CORS headers present for browser compatibility.
**Nullification Test:** Preflight OPTIONS request; verify headers.

**Pass Criterion:** Access-Control-Allow-Origin present.

---

## Peer-Reviewed Citations

1. **Popper, K.R.** (1959). *The Logic of Scientific Discovery*. Hutchinson. ISBN 978-0415278447.

2. **Serebryany, K., Bruening, D., Potapenko, A., & Vyukov, D.** (2012). AddressSanitizer: A Fast Address Sanity Checker. *USENIX ATC '12*. https://www.usenix.org/conference/atc12/technical-sessions/presentation/serebryany

3. **Dean, J., & Barroso, L.A.** (2013). The Tail at Scale. *Communications of the ACM*, 56(2), 74-80. https://doi.org/10.1145/2408776.2408794

4. **Liker, J.K.** (2004). *The Toyota Way: 14 Management Principles from the World's Greatest Manufacturer*. McGraw-Hill. ISBN 978-0071392310.

5. **Dettmers, T., Lewis, M., Belkada, Y., & Zettlemoyer, L.** (2022). LLM.int8(): 8-bit Matrix Multiplication for Transformers at Scale. *NeurIPS 2022*. https://arxiv.org/abs/2208.07339

6. **Goodfellow, I., Bengio, Y., & Courville, A.** (2016). *Deep Learning*. MIT Press. Chapter 4: Numerical Computation. ISBN 978-0262035613.

7. **Yu, G.I., Jeong, J.S., Kim, G.W., Kim, S., & Chun, B.G.** (2022). Orca: A Distributed Serving System for Transformer-Based Generative Models. *OSDI '22*. https://www.usenix.org/conference/osdi22/presentation/yu

8. **Gunawi, H.S., Hao, M., Leesatapornwongsa, T., Patana-anake, T., Do, T., Adityatama, J., ... & Deng, L.** (2014). What Bugs Live in the Cloud? A Study of 3000+ Issues in Cloud Systems. *SoCC '14*. https://doi.org/10.1145/2670979.2670986

9. **Fan, A., Lewis, M., & Dauphin, Y.** (2018). Hierarchical Neural Story Generation. *ACL 2018*. https://arxiv.org/abs/1805.04833

10. **Hendrycks, D., & Gimpel, K.** (2016). Gaussian Error Linear Units (GELUs). *arXiv preprint*. https://arxiv.org/abs/1606.08415

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## Execution Protocol

### Pre-Flight Checklist

- [ ] Clean build: `cargo clean && cargo build --release`
- [ ] Fresh environment: No cached state
- [ ] Instrumentation enabled: ASan, TSan, MSan available
- [ ] Baseline established: Known-good reference measurements

### Execution Order

1. **S1 checks first** (safety-critical) — any failure stops execution
2. **S2 checks second** (functional) — failures block release
3. **S3 checks third** (performance) — failures require remediation plan
4. **S4 checks last** (quality) — tracked for improvement

### Documentation Requirements

For each failed check:
1. Record exact failure mode
2. Identify root cause (5 Whys)
3. Implement countermeasure
4. Verify fix does not regress other checks
5. Update checklist with lessons learned (Kaizen)

### Sign-Off

| Role | Name | Date | Signature |
|------|------|------|-----------|
| QA Lead | | | |
| Tech Lead | | | |
| Security | | | |
| Release Manager | | | |

---

*"Quality is not an act, it is a habit." — Aristotle*

*"Stop the line when you see a defect." — Taiichi Ohno*

*"Test what you fly, fly what you test." — NASA*
