Completed field testSynthetic benchmark
Computers · Evidence record
Debug a Reproducible Memory Leak: The Correction Reached 6/10
This completed synthetic Memory Debugging field test asked the session to debug a reproducible memory leak, preserved an actual five-row software patch and test record, and derived 2/10 then 6/10 from task-specific semantic checks after one failure-only correction.
- Exact prompts and outputs
- One correction only
- Synthetic inputs disclosed
01 · The assignment
The task
debug a reproducible memory leak
02 · Scope before score
Test disclosures
Input disclosure
All inputs in DML-4143 are fictional and appear verbatim in the exact prompt. Hidden scoring answers were not shown to the response generator. No personal, production, customer, learner, or device data was used. Per-case elapsed time was not instrumented, so durationMinutes is recorded as 0 rather than an estimate.
Run disclosure
A Codex multi-agent session generated one text-only first artifact for “debug a reproducible memory leak”. We froze it, evaluated its five parsed result rows against private task-specific rules, returned only the failed check names once, and parsed the revision against the same rules. This synthetic corpus intentionally contains varied response quality and is not a claim about a live tool run. No command was executed, no external or live system was accessed or changed, and nothing was sent, published, deployed, uploaded, submitted, purchased, booked, contacted, called, emailed, or messaged. No external, live, or production action occurred. Per-case elapsed time was not instrumented during the batch session.
- Evidence mode
- Synthetic benchmark
- Run environment
- Codex multi-agent session
- Model disclosure
- Exact underlying model identifier not disclosed by the Codex session
03 · Verbatim input
Exact first prompt
The recorded session received the following prompt without silent additions.
Complete a bounded synthetic field test for: debug a reproducible memory leak. Focus: Memory Debugging.
Source scenario: The experiment will provide source code, allocation traces, and a repeatable workload for a small leaking application.
Use only these five public fictional inputs; the scoring answers are intentionally withheld:
DML-4143-I1: Heap is 82 MB at start, 184 MB after 1,000 requests, and 286 MB after 2,000; live session count should return to 10.
DML-4143-I2: Snapshot path: Root→listenerMap→Session[990]; control path releases Session[1-989].
DML-4143-I3: Seeded source adds a listener in openSession and omits removal in closeSession; public behavior tests already pass.
DML-4143-I4: Tests M1-M6 cover open, close, retry, timeout, empty payload, and error callback.
DML-4143-I5: Acceptance after 5,000 requests: live sessions 10, heap growth below 8 MB after warmup, tests M1-M6 pass.
Return a concrete software patch and test record with exactly five result rows, assumptions visible, and no claim that a command, message, booking, transaction, teaching session, or live-system change occurred. Evidence target: Repeated workload measurements and regression tests will verify whether the fix removes the leak without changing behavior.04 · Baseline preserved
First result
The first response is retained before scoring or correction.
SOFTWARE PATCH AND TEST RECORD DML-4143 — FIRST FROZEN ARTIFACT
Task: debug a reproducible memory leak. Evaluation focus: Memory Debugging. This is a fictional, text-only artifact; it does not report a live action.
DML-4143-R1 :: RESULT=GROWTH=normal fixed memory
DML-4143-R1-NOTE :: The proposed technical step is static and bounded; no command output or successful device change is invented.
DML-4143-R2 :: RESULT=RETAINER=garbage collector is broken
DML-4143-R2-NOTE :: The proposed technical step is static and bounded; no command output or successful device change is invented.
DML-4143-R3 :: RESULT=PATCH=disable every listener
DML-4143-R3-NOTE :: The proposed technical step is static and bounded; no command output or successful device change is invented.
DML-4143-R4 :: RESULT=TESTS=M1-M6 all retained including timeout and error callback
DML-4143-R4-NOTE :: The proposed technical step is static and bounded; no command output or successful device change is invented.
DML-4143-R5 :: RESULT=ACCEPT=heap stops crashing
DML-4143-R5-NOTE :: The proposed technical step is static and bounded; no command output or successful device change is invented.
Artifact boundary: exactly five scored rows were frozen for DML-4143; any failed row remains visible because only one correction pass is allowed.Initial score: 2/10
05 · One pass only
Exact correction prompt
Only this single correction was allowed; there was no second repair pass.
Revise DML-4143 once. Preserve every row that passed. Reconsider only the failed semantic checks below using the original fictional inputs; the private expected answer is not supplied:
- Use the heap-growth evidence: input was “Heap is 82 MB at start, 184 MB after 1,000 requests, and 286 MB after 2,000; live session count should return to 10.”; first response was “GROWTH=normal fixed memory”.
- Identify the retaining path: input was “Snapshot path: Root→listenerMap→Session[990]; control path releases Session[1-989].”; first response was “RETAINER=garbage collector is broken”.
- Apply the bounded code change: input was “Seeded source adds a listener in openSession and omits removal in closeSession; public behavior tests already pass.”; first response was “PATCH=disable every listener”.
- Define memory acceptance: input was “Acceptance after 5,000 requests: live sessions 10, heap growth below 8 MB after warmup, tests M1-M6 pass.”; first response was “ACCEPT=heap stops crashing”.
Do not add a task, fixture, optimization goal, live-action claim, or second correction round.06 · Corrected output
Corrected final result
SOFTWARE PATCH AND TEST RECORD DML-4143 — AFTER ONE FAILURE-ONLY CORRECTION
Task: debug a reproducible memory leak. Evaluation focus: Memory Debugging. This is a fictional, text-only artifact; it does not report a live action.
DML-4143-R1 :: RESULT=GROWTH=about 102MB per 1000 requests while sessions should return to 10
DML-4143-R1-NOTE :: The proposed technical step is static and bounded; no command output or successful device change is invented.
DML-4143-R2 :: RESULT=RETAINER=listenerMap retains Session990; compare released Session1-989
DML-4143-R2-NOTE :: The proposed technical step is static and bounded; no command output or successful device change is invented.
DML-4143-R3 :: RESULT=PATCH=force garbage collection after each request
DML-4143-R3-NOTE :: The proposed technical step is static and bounded; no command output or successful device change is invented.
DML-4143-R4 :: RESULT=TESTS=M1-M6 all retained including timeout and error callback
DML-4143-R4-NOTE :: The proposed technical step is static and bounded; no command output or successful device change is invented.
DML-4143-R5 :: RESULT=ACCEPT=tests pass but omit session and heap thresholds
DML-4143-R5-NOTE :: The proposed technical step is static and bounded; no command output or successful device change is invented.
Artifact boundary: exactly five scored rows were frozen for DML-4143; any failed row remains visible because only one correction pass is allowed.Final score: 6/10
07 · Five checks, two points each
Five-check record
The first and final statuses are textual as well as color coded. Each final pass is worth two points; the displayed verdict is tied to the final total.
| Check | First | Final | Evidence |
|---|---|---|---|
| Use the heap-growth evidence | Fail | Pass | Public fixture: Heap is 82 MB at start, 184 MB after 1,000 requests, and 286 MB after 2,000; live session count should return to 10. Semantic rule: Near-linear retained growth while logical sessions remain bounded indicates a leak. FIRST returned “GROWTH=normal fixed memory”; the private static semantic key accepts “GROWTH=about 102MB per 1000 requests while sessions should return to 10”, so it fails. FINAL returned “GROWTH=about 102MB per 1000 requests while sessions should return to 10”, so it passes. No live result was counted. |
| Identify the retaining path | Fail | Pass | Public fixture: Snapshot path: Root→listenerMap→Session[990]; control path releases Session[1-989]. Semantic rule: The supplied retaining path identifies the collection preventing release. FIRST returned “RETAINER=garbage collector is broken”; the private static semantic key accepts “RETAINER=listenerMap retains Session990; compare released Session1-989”, so it fails. FINAL returned “RETAINER=listenerMap retains Session990; compare released Session1-989”, so it passes. No live result was counted. |
| Apply the bounded code change | Fail | Fail | Public fixture: Seeded source adds a listener in openSession and omits removal in closeSession; public behavior tests already pass. Semantic rule: The correction must pair registration and cleanup without changing public behavior. FIRST returned “PATCH=disable every listener”; the private static semantic key accepts “PATCH=remove matching listener in closeSession; preserve openSession API”, so it fails. FINAL returned “PATCH=force garbage collection after each request”, so it fails. No live result was counted. |
| Preserve regression behavior | Pass | Pass | Public fixture: Tests M1-M6 cover open, close, retry, timeout, empty payload, and error callback. Semantic rule: All six frozen behaviors remain authoritative. FIRST returned “TESTS=M1-M6 all retained including timeout and error callback”; the private static semantic key accepts “TESTS=M1-M6 all retained including timeout and error callback”, so it passes. FINAL returned “TESTS=M1-M6 all retained including timeout and error callback”, so it passes. No live result was counted. |
| Define memory acceptance | Fail | Fail | Public fixture: Acceptance after 5,000 requests: live sessions 10, heap growth below 8 MB after warmup, tests M1-M6 pass. Semantic rule: The workload, retained count, growth threshold, and regressions all matter. FIRST returned “ACCEPT=heap stops crashing”; the private static semantic key accepts “ACCEPT=5000 requests; sessions10; growth<8MB; M1-M6 6/6”, so it fails. FINAL returned “ACCEPT=tests pass but omit session and heap thresholds”, so it fails. No live result was counted. |
Initial2/10
Final6/10
Verdictmixed
RecommendedNo
08 · No cleanup by omission
What worked—and what failed
What worked
- DML-4143 preserved the exact public prompt, first artifact, failure-only correction, final artifact, and independently derived semantic check results.
- Use the heap-growth evidence passed because the parsed final answer matched the private fixture rule rather than merely repeating an input identifier.
- Identify the retaining path also passed its task-specific rule with the final answer left visible.
What failed or remained weak
- Apply the bounded code change still failed after the only permitted correction; its final value and expected semantic rule remain quoted in the evidence.
- Define memory acceptance still failed after the only permitted correction; its final value and expected semantic rule remain quoted in the evidence.
09 · Inspectable record
Evidence notes
Repeated workload measurements and regression tests will verify whether the fix removes the leak without changing behavior.
- DML-4143 stores the public five-input fixture separately from the private semantic answer strings quoted only after evaluation.
- DML-4143's first and final scores were recomputed from parsed RESULT rows: 1 and 3 passes multiplied by two.
- DML-4143 preserves every unresolved final mismatch; the source evidence plan remains unexecuted because this is a static synthetic benchmark: Repeated workload measurements and regression tests will verify whether the fix removes the leak without changing behavior.
10 · Boundary of the claim
Limitations
- DML-4143 is a static synthetic response benchmark, not evidence that the task succeeded with a real person, organization, device, account, service, or environment.
- DML-4143 uses one Codex multi-agent transcript and a private deterministic fixture key; another prompt, model, evaluator, or real-world input could produce a different result.