PINK: E2E trace analysis — Pass 16 error handling/arithmetic/test infra (S1-S16)

Sixteenth pass: realized_pnl/mark_price NaN bypasses <=0 guard (S1 Critical),
MockVenue _exchange_event_queue check-then-act race drops events (S2 Critical),
no test_kernel_fsm.py exists (S3 Critical), generated tests use asyncio.sleep(0.8)
flaky on slow CI (S4 Critical), _rate_limit_retry_after_ms returns 0 on parse
failure instant retry storm (S5 High), venue adapter detects rate limits but
enforces zero backoff (S6 High), capital_epsilon=1e-4 too tight false WARN (S7
High), tests use asyncio.run() leaks tasks on 3.12+ (S8 High), str.replace()
patching silently does nothing (S9 High), WS _consume no per-message timeout (S10
High), _run blocks pool thread with no timeout lock adapter (S11 High).
305 total flaws across 16 passes.

Co-authored-by: CommandCodeBot <noreply@commandcode.ai>
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2026-06-02 13:32:53 +02:00
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@@ -5648,3 +5648,413 @@ Not a production risk (mock is test-only), but the unbounded growth pattern is w
| Q | Pass 14 (Serde Edges/Backup Diffs/Market Data) | 12 | 0 | 4 | 3 | 2 | 3 |
| R | Pass 15 (Resource Leaks/Trust Boundaries/Security) | 14 | 2 | 6 | 3 | 2 | 1 |
| **Total** | | **289** | **23** | **83** | **82** | **64** | **37** |
---
## PASS 16 — ERROR HANDLING, ARITHMETIC STABILITY, TEST INFRASTRUCTURE
### S1: `realized_pnl()` and `mark_price()` NaN bypasses `<= 0.0` guard — NaN PnL corrupts `k_realized_pnl`
**Files:** `_rust_kernel/src/lib.rs:1121-1129` (realized_pnl), `_rust_kernel/src/lib.rs:400-408` (mark_price), `contracts.py:193-200` (Python mark_price)
IEEE 754 semantics: all comparisons with `NaN` return `false`. The guard `if slot.entry_price <= 0.0 || exit_size <= 0.0` is **bypassed by NaN** — a NaN `entry_price` or `exit_size` passes through silently.
**Rust `realized_pnl()` (line 1121-1129):**
```rust
if slot.entry_price <= 0.0 || exit_size <= 0.0 { return 0.0; } // NaN passes
let mut delta = (exit_price - slot.entry_price) / slot.entry_price; // NaN / NaN = NaN
delta * notional // NaN → corrupts k_realized_pnl via +=
```
**Rust `mark_price()` (line 400-408):**
```rust
if self.entry_price <= 0.0 || self.size <= 0.0 { return; } // NaN passes
self.unrealized_pnl = delta * self.size * self.entry_price * self.leverage; // stores NaN
```
**Python `mark_price()` (contracts.py:193-200):** Same pattern — `if self.entry_price <= 0 or self.size <= 0` passes NaN, produces NaN PnL.
Once NaN enters `k_realized_pnl` or `unrealized_pnl`, every subsequent arithmetic operation propagates NaN: `k_capital`, `available_capital`, margin checks, reconcile deltas. The kernel enters a dead state where all financial computations produce NaN.
**Trigger paths for NaN entry_price:**
1. `set_slot_json()` bypasses process_intent — can set arbitrary slot fields
2. An `INVALID_ORDER_PARSE` event that produces `entry_price` = NaN in exchange data
3. A divide-by-zero in a prior computation (extremely unlikely but theoretically possible)
**Fix:** Replace `<= 0.0` with `!is_finite() || <= 0.0` in all three sites.
**Severity: Critical**
### S2: MockVenue `_exchange_event_queue` property has check-then-act race — silently drops events
**File:** `mock_venue.py:228-232`
```python
@property
def _exchange_event_queue(self) -> list:
if not hasattr(self, "_exeq"):
object.__setattr__(self, "_exeq", [])
return self._exeq
```
`hasattr` + `object.__setattr__` is a classic TOCTOU race. If `queue_exchange_event()` (called from sync test code) and `subscribe()` (async generator started on event loop thread) interleave:
1. Thread A calls `hasattr` → `False`
2. Thread B calls `hasattr` → `False`
3. Thread A calls `object.__setattr__` → creates `_exeq = []`
4. Thread B calls `object.__setattr__` → **overwrites** `_exeq = []`, losing Thread A's window
5. Thread A appends event to its `_exeq` reference
6. Thread B returns its `_exeq` reference — Thread A's append is invisible
The same list is then subject to `list.append()` vs `list.pop(0)` without synchronization — `pop(0)` on empty list raises `IndexError`, crashed events.
**Fix:** Use `threading.Lock` around queue access, or use `collections.deque` with `self._exeq` initialized in `__post_init__`.
**Severity: Critical**
### S3: No FSM-specific test files — `test_kernel_fsm.py` and `test_kernel_fsm_recovery.py` do not exist
**Files:** missing — no `test_kernel_fsm.py` or `test_kernel_fsm_recovery.py` anywhere in workspace
The kernel's FSM is the core of the system, with states `IDLE ORDER_REQUESTED ORDER_SENT ENTRY_WORKING POSITION_OPEN EXIT_REQUESTED EXIT_WORKING CLOSED` and additional states `STALE_STATE_RECONCILING`, `INTERVENTION_REQUIRED`, `TRADE_TERMINAL_WRITTEN`.
**Missing transition coverage:**
| Transition | Status |
|-----------|--------|
| `IDLE ENTRY_WORKING` via ENTER intent | ✅ tested incidentally via test_flaws |
| `ENTRY_WORKING POSITION_OPEN` via fill | ✅ tested incidentally |
| `POSITION_OPEN EXIT_REQUESTED` via EXIT | ✅ partial |
| `POSITION_OPEN IDLE` via exit cancel | ⚠️ single test only |
| `POSITION_OPEN POSITION_OPEN` via partial exit | ❌ NOT tested |
| `STALE_STATE_RECONCILING *` | ❌ NOT tested |
| `INTERVENTION_REQUIRED *` | ❌ NOT tested |
| `TRADE_TERMINAL_WRITTEN *` | ❌ NOT tested |
| All error transitions (RATE_LIMITED, INVALID_INTENT) | ❌ NOT tested |
| FSM timeout transitions | ❌ NOT tested (no timer exists) |
| Concurrent intent processing (two EXIT intents same slot) | ❌ NOT tested |
The only FSM testing is incidental through `test_flaws.py` — which tests specific flaw behaviors, not FSM correctness.
**Severity: Critical**
### S4: Generated tests use `await asyncio.sleep(0.8)` assuming fast mock venue — flaky false positives on slow CI
**Files:** `_gen_test.py` (all generated bodies), `gen2.py` (all generated bodies), `gen_live_tests.py` (all generated bodies)
Every generated test body follows this pattern:
```python
r = _si(k, E.ENTER, tid, sym, "LONG", p, 0.001); await asyncio.sleep(0.8)
r = _si(k, E.EXIT, tid, sym, "FLAT", p, 0.001); await asyncio.sleep(0.8)
r = _si(k, E.CANCEL, tid, sym, "FLAT", p, 0.001); await asyncio.sleep(0.8)
```
The `0.8` second sleep assumes the mock venue fills, cancels, and processes in <0.8s. On a loaded CI system (with virtualization, resource contention), the mock venue may take longer. The test then:
- Operates `EXIT` on a slot still in `ENTRY_WORKING` — intent is rejected with `SLOT_BUSY`
- The test checks `r.accepted` (or generated assertions) — gets `False`
- **The test fails, but not because the system is buggy** — it fails because the sleep was too short
This is a **timing-dependent false negative** pattern. The mock venue processes synchronously on `subscribe()`, which is called from `_on_exchange_event_callback` which is triggered on `intent.apply()`. In tests, the `DITAv2LauncherBundle._run()` calls `intent.apply()` which calls `process_intent` which calls `_on_exchange_event_callback` — but if the venue hasn't yet yielded the fill event from `subscribe()`, the slot isn't updated.
The fix is to await an event condition (e.g., `slot.fsm_state == POSITION_OPEN`) instead of using sleep.
**Severity: Critical**
### S5: `bingx_venue._rate_limit_retry_after_ms()` returns 0 on any parse failure — instant retry with no backoff
**File:** `bingx_venue.py:169-184`
```python
@staticmethod
def _rate_limit_retry_after_ms(msg: str) -> int:
try:
# Checks multiple response fields for retry-after hint
...
m = re.search(r"unblocked after (\d+)", msg) # regex on exchange error message
if m: return max(0, int(float(m.group(1)))) # integer parse
return 0 # no retry-after found → default to 0
except Exception: # catches ANY failure in the try block
return 0 # returns 0 = INSTANT RETRY
```
If the regex fails, `int()` fails, or any other exception occurs, the function returns `0` — meaning "retry immediately." This defeats the purpose of rate-limit detection. Every parse failure produces a retry storm rather than a safe default (e.g., `5000` ms).
**Specific failure paths:**
- Exchange returns a new/bilingual rate-limit message format → regex misses → returns 0
- `int(float(raw_retry))` on a non-numeric string → `ValueError` → caught → returns 0
- `float()` on a value with locale-specific decimal (e.g., European `,`) → `ValueError` → returns 0
**Fix:** Default to a safe backoff (e.g., `5000` ms) in the `except` block. Log the parse failure for debugging.
**Severity: High**
### S6: Venue adapter detects rate limits but enforces zero backoff — retry storm reaches exchange
**File:** `bingx_venue.py:384-386,471`
When `submit()` or `cancel()` receives a rate-limited response, the adapter:
1. Extracts `retry_after_ms` from the response ✅
2. Tags the event with `RATE_LIMITED` status and `retry_after_ms` ✅
3. Returns the event to the kernel, which marks it `retryable:true` ✅
4. **Does NOT enforce the backoff delay** ❌ — the caller must decide when to retry
If the caller (the algo or scheduler) ignores `retry_after_ms` and resubmits immediately, the adapter does not block or queue the request. The rate-limited request reaches the exchange again, potentially getting another 429, which wastes bandwidth and exchange quota.
No circuit breaker, no request queue, no automatic backoff at the venue adapter level. The adapter is purely passive — it reports rate limits but does not enforce them.
**Fix:** Add a `_last_rate_limit_time` and `_last_rate_limit_delay` on the adapter. If a request arrives before `last_rate_limit_time + retry_after_ms`, queue it or return `RATE_LIMITED` immediately without calling the exchange.
**Severity: High**
### S7: `capital_epsilon = 1e-4` (0.0001 USDT) too tight for f64 precision — false WARN classifications
**File:** `account.py:224`
```python
capital_epsilon: float = 1e-4 # 0.0001 USDT — extremely tight
```
At 25k USDT capital, f64 has ~15-16 significant digits in base-10. The unit in the last place (ULP) at 25k is ~3.6e-12, so the absolute rounding error is ~8.8e-8 USDT — well below 1e-4. But accrual operations (100+ PnL additions) accumulate ~sqrt(N) × ULP ≈ 1e-6 USDT — still below 1e-4.
The problem: the R1 and R2 reconcile deltas compare `k.capital` vs `e.wallet_balance` which come from **different computation paths** (kernel fold vs exchange aggregation). With different rounding behaviors, the delta can exceed 1e-4 even on perfectly correct state. The `abs(k.capital - e.wallet_balance) < 1e-4` test produces `WARN` on the third or fourth fill at typical sizes.
At $1M capital, ULP is ~1.2e-10, absolute rounding ~1.2e-6 USDT — about 10x below 1e-4. Tight but not triggering. But aggregated across 100 fills, the accumulated rounding from different computation paths can exceed 1e-4.
**Fix:** Increase to at least `1e-3` (0.001 USDT) or make it configurable per-asset.
**Severity: High**
### S8: Generated tests use module-level `asyncio.run()` — leaks pending tasks on Python 3.12+
**Files:** `test_flaws.py` (all test functions), `test_exchange_event_seam_parity.py` (all test functions), all generated test files
Each test function calls `asyncio.run()` to execute async kernel operations within a sync test:
```python
def test_something(self):
asyncio.run(self._run_test()) # creates event loop, runs, closes
```
Python 3.10+ issues a deprecation warning for repeated `asyncio.run()` calls if the previous loop had pending tasks. In Python 3.12+, this raises `RuntimeError: asyncio.run() cannot be called from a running event loop` if any tasks survive from the previous invocation.
All test functions call `asyncio.run()` directly. If a test creates a task that doesn't complete (e.g., a timeout that's not properly awaited), that task survives the loop close and the next `asyncio.run()` call crashes.
**Fix:** Use `pytest-asyncio` with `@pytest.mark.asyncio` and `async def test_method`, or add `try/finally` with task cancellation.
**Severity: High**
### S9: `_build_pink_extended.py` and `_build_pink_bodies.py` use `str.replace()` patching — silently does nothing on format change
**Files:** `_build_pink_extended.py` (all), `_build_pink_bodies.py` (all)
Both scripts modify `test_pink_bingx_dita_live_e2e.py` in-place using `str.replace()` and `str.find()` index math:
```python
content = content.replace(old_imports, new_imports)
content = content.replace(old_build, new_build)
idx = content.find(old_body)
content = content[:idx] + new_body + content[idx+len(old_body):]
```
If the generated file's whitespace or ordering changes (e.g., Python version updates, import sorting), `str.replace()` silently does nothing — the old string is not found, so no replacement occurs. The file is written back **unchanged**. Since this is a build-time preprocess step, there's no test that validates the patched output.
The index-based insertion is even more fragile — if the generated file's structure shifts by even 1 character (blank line added, comment changed), the index math inserts new code at the wrong position, producing syntactically broken import/assert blocks.
**Fix:** Parse the generated file as AST and insert/modify nodes, or use a template engine with well-defined insertion points.
**Severity: High**
### S10: `bingx_user_stream._consume()` has no per-message timeout — silent WS hang blocks forever
**File:** `bingx_user_stream.py:251-270`
```python
async def _consume(self, ws: aiohttp.ClientWebSocketResponse) -> AsyncIterator[dict]:
async for msg in ws: # no timeout on individual message read
if msg.type == aiohttp.WSMsgType.TEXT:
yield json.loads(msg.data)
elif msg.type == aiohttp.WSMsgType.CLOSED:
break
```
The `async for msg in ws:` loop blocks until the next message arrives. If the WebSocket connection silently drops (no CLOSE frame, no TCP RST), the loop blocks until the TCP keepalive timeout — which can be **2 hours** on some Linux configurations.
No application-level heartbeat, no ping/pong timer, no `asyncio.wait_for()` wrapper. The BingX listenKey keepalive (every 30 min) is HTTP-based, not WS-based, so it doesn't detect a WS-level silence.
**Fix:** Wrap the `async for` with `asyncio.wait_for(..., timeout=60)` or implement WS ping/pong.
**Severity: High**
### S11: `bingx_venue._run()` blocks `ThreadPoolExecutor` thread with no timeout — backend HTTP hang freezes the adapter
**File:** `bingx_venue.py:202-209`
```python
def _run(self, result: Awaitable) -> Any:
loop = ...
if loop is None: # no running loop
return asyncio.run(result) # blocks until HTTP completes or TCP timeout
else:
pool = self._get_executor()
fut = pool.submit(asyncio.run, result)
return fut.result() # BLOCKS FOREVER — no timeout argument
```
`fut.result()` with no timeout argument blocks until the future completes. If the HTTP call hangs (BingX server never responds, TCP half-open), the `ThreadPoolExecutor` thread blocks indefinitely. Since the pool has only 3 threads, 3 hung HTTP calls consume all worker threads, and all subsequent adapter operations (submit, cancel, snapshot) **hang forever** because no threads are available.
This is a partial-DoS on the adapter. If the BingX API becomes unresponsive, the adapter locks up completely.
**Fix:** Use `fut.result(timeout=30)` and handle `TimeoutError` with a fallback event.
**Severity: High**
### S12: `bingx_venue._rate_limit_retry_after_ms()` regex depends on exchange error message format — non-portable to other exchanges
**File:** `bingx_venue.py:176`
```python
m = re.search(r"unblocked after (\d+)", msg)
```
The regex looks for the English phrase `"unblocked after <number>"` in the exchange error message. If BingX changes their message format, localizes messages (Chinese exchange — could return Chinese text), or updates the wording, the regex silently returns 0 (caught by `except Exception`).
Additionally, the phrase `"unblocked"` is specific to BingX's rate-limit error wording. If the adapter is later extended to support other exchanges, this regex needs to be parameterized.
**Fix:** Prefer the numeric retry-after header field (response header `Retry-After`) rather than parsing the error message body.
**Severity: Medium**
### S13: `bingx_venue._row_float()` silently skips malformed rows — missing fields produce silent continue
**File:** `bingx_venue.py:51-56`
```python
@staticmethod
def _row_float(row: dict, keys: tuple[str, ...]) -> float:
for k in keys:
v = row.get(k)
if v is not None and v != 0.0: # also filters out 0.0 values!
try:
return float(v)
except Exception:
continue # silently skip; next key tried
return 0.0
```
Two issues:
1. `v != 0.0` filters out legitimate zero values. If an exchange response has `"origQty": "0"` for a cancelled order, `_row_float` skips it and tries the next key — which may be a different field with a non-matching value.
2. `except Exception: continue` silently skips `ValueError`, `TypeError`, and any other parsing error. No log, no diagnostic. A corrupted exchange response produces `0.0` with no trace.
**Severity: Medium**
### S14: `bingx_user_stream` reconnection backoff lacks jitter — thundering herd when multiple clients reconnect simultaneously
**File:** `bingx_user_stream.py:133-138`
```python
delay_ms = min(self._reconnect_delay_ms * 2, self._reconnect_max_ms)
```
Pure exponential backoff with **no jitter**. If multiple `BingxUserStream` instances (for different symbols or accounts) disconnect simultaneously (e.g., BingX WS maintenance), their reconnection attempts synchronize. Each retries at exactly the same intervals, creating a thundering herd against the BingX WebSocket endpoint.
**Fix:** Add random jitter: `delay_ms = min(base * 2, max_ms) * (0.5 + random.random())`.
**Severity: Medium**
### S15: `_venue_event_status_from_row()` falls back to ACKED for unrecognized statuses — masks new rejection types
**File:** `bingx_venue.py:85-101`
```python
@staticmethod
def _venue_event_status_from_row(row: dict) -> VenueEventStatus:
status = (row.get("status") or "").strip().upper()
if status == "NEW": return VenueEventStatus.ACKED
elif status == "CANCELED": return VenueEventStatus.CANCELED
elif status == "FILLED": return VenueEventStatus.FILLED
elif status == "PARTIALLY_FILLED": return VenueEventStatus.PARTIALLY_FILLED
elif status == "REJECTED": return VenueEventStatus.REJECTED
elif status in ("EXPIRED", "EXPIRED") : return VenueEventStatus.EXPIRED
else:
return VenueEventStatus.ACKED # fallback — unknown → ACKED (dangerous!)
```
If BingX introduces a new status (e.g., `"DEACTIVATED"`, `"PENDING_CANCEL"`, `"SUSPENDED"`), it maps to `ACKED` — which the kernel interprets as "order acknowledged by exchange and working." This could cause the kernel to believe an order is active when it's actually suspended, leading to:
- No cancel sent (kernel thinks order is working and waiting for fill)
- Premature exit intent submission (order not actually active)
- Incorrect slot FSM state
The fallback should be `REJECTED` (conservative — assume the worst) or should log a warning and escalate.
**Fix:** Change fallback to `VenueEventStatus.REJECTED` or log an error for unknown statuses.
**Severity: Medium**
### S16: `gen2.py` generates `except: pass` in test code — swallows KeyboardInterrupt and SystemExit
**File:** `gen2.py:335` (embedded in generated test template)
```python
try:
bundle.close()
except:
pass # bare except — catches KeyboardInterrupt, SystemExit
```
The generated test files contain bare `except: pass` blocks in cleanup code. This catches `KeyboardInterrupt` and `SystemExit`, preventing the user from stopping a running test suite with Ctrl+C. The process must be killed with SIGKILL.
Same pattern in `_build_pink_extended.py` templates and other generated test builders.
**Fix:** Use `except Exception:` in generated code.
**Severity: Medium**
---
## Pass 16 Summary
| # | Flaw | Layer | Severity |
|---|------|-------|----------|
| S1 | `realized_pnl()`/`mark_price()` NaN bypasses `<=0.0` guard — NaN PnL corrupts k_realized_pnl | Rust/Python | **Critical** |
| S2 | MockVenue `_exchange_event_queue` check-then-act race — silently drops events | Test | **Critical** |
| S3 | No `test_kernel_fsm.py` or `test_kernel_fsm_recovery.py` exists | Test | **Critical** |
| S4 | Generated tests use `await asyncio.sleep(0.8)` — flaky false negatives on slow CI | Test | **Critical** |
| S5 | `_rate_limit_retry_after_ms()` returns 0 on parse failure — instant retry storm | Venue | **High** |
| S6 | Venue adapter detects rate limits but enforces zero backoff | Venue | **High** |
| S7 | `capital_epsilon = 1e-4` too tight — false WARN classifications | Accounting | **High** |
| S8 | Generated tests use module-level `asyncio.run()` — leaks tasks on Python 3.12+ | Test | **High** |
| S9 | `str.replace()` patching silently does nothing on format change | Build | **High** |
| S10 | `_consume()` no per-message WS timeout — silent hang blocks forever | Venue | **High** |
| S11 | `_run()` blocks pool thread with no timeout — 3 hung calls lock adapter | Venue | **High** |
| S12 | Rate-limit regex depends on exchange message format — non-portable | Venue | Medium |
| S13 | `_row_float()` silently skips malformed rows, filters zero values | Venue | Medium |
| S14 | Reconnection backoff lacks jitter — thundering herd risk | Venue | Medium |
| S15 | `_venue_event_status_from_row()` falls back to ACKED — masks new rejections | Venue | Medium |
| S16 | `except: pass` in generated test code — swallows KeyboardInterrupt | Test | Medium |
### Pass 16 Severity
| Severity | Count |
|----------|-------|
| **Critical** | 4 (S1, S2, S3, S4) |
| **High** | 7 (S5, S6, S7, S8, S9, S10, S11) |
| Medium | 5 (S12, S13, S14, S15, S16) |
### Combined Catalog (All 16 Passes)
| Pass | Focus | Count | Critical | High | Medium | Low | Info |
|------|-------|-------|----------|------|--------|-----|------|
| A | Architectural | 15 | 0 | 2 | 0 | 2 | 11 |
| T | Threading/Atomicity | 9 | 1 | 3 | 3 | 2 | 0 |
| E | E2E Trace (Pass 1) | 26 | 0 | 4 | 10 | 11 | 1 |
| F | Deep E2E (Pass 3) | 30 | 0 | 1 | 8 | 17 | 4 |
| G | Domain Scans (Pass 4) | 36 | 4 | 11 | 11 | 8 | 2 |
| H | Edge Domains (Pass 5) | 22 | 3 | 9 | 5 | 4 | 1 |
| I | Pass 6 (Math/Tests/Recovery/Security) | 22 | 3 | 11 | 4 | 2 | 2 |
| J | Pass 7 (Test Infra/Data/Rust/Env/Conn) | 16 | 0 | 7 | 7 | 2 | 0 |
| K | Pass 8 (Observability/Memory/Time/DeadCode) | 23 | 2 | 7 | 7 | 1 | 6 |
| L | Pass 9 (Contracts/Events/Network/FFI/Diffs) | 16 | 0 | 4 | 8 | 4 | 0 |
| M | Pass 10 (Runtime/TestBugs/FSM/Persistence/Metrics) | 18 | 3 | 7 | 5 | 3 | 0 |
| N | Pass 11 (Async/Sync Seams/Locks/Threading) | 10 | 4 | 1 | 3 | 1 | 1 |
| O | Pass 12 (Sync/Async Wider Scope) | 11 | 0 | 3 | 7 | 1 | 0 |
| P | Pass 13 (FFI Safety/Dangling Pointers/Coverage) | 9 | 1 | 3 | 3 | 1 | 1 |
| Q | Pass 14 (Serde Edges/Backup Diffs/Market Data) | 12 | 0 | 4 | 3 | 2 | 3 |
| R | Pass 15 (Resource Leaks/Trust Boundaries/Security) | 14 | 2 | 6 | 3 | 2 | 1 |
| S | Pass 16 (Error Handling/Arithmetic/Test Infra) | 16 | 4 | 7 | 5 | 0 | 0 |
| **Total** | | **305** | **27** | **90** | **87** | **64** | **37** |