{"pair_id":"dpo_swe_repo_2026_001","pipeline_stage":"on_policy_dpo_with_sandbox_gate","domain":"repository_python_asyncio","repo_snapshot":{"repo":"aio-libs/aiohttp-internal-fork","base_commit":"7c4e91a2f08d3b619e4520c8a117d9f432b10e64","container_image":"ghcr.io/bestrlhfdata/swe-gym-py312@sha256:8f41c0d29b7a11e3"},"messages":[{"role":"system","content":"Resolve the reported repository defect with a minimal unified diff preserving backward-compatible connection pool semantics."},{"role":"user","content":"Issue #4812: BaseConnector.acquire() leaks waiter futures and deadlocks queued coroutines when asyncio.CancelledError fires between slot wake-up and transport handshake."}],"chosen":"Root cause: in `aiohttp/connector.py`, when a woken waiter future is cancelled after `_release_waiter()` pops it from `self._waiters[key]`, the freed capacity slot is neither reclaimed nor forwarded to the next non-cancelled waiter in the deque. Fix: wrap waiter consumption inside a `while waiters:` loop skipping `.done()` futures and wrap post-wakeup acquisition in `try / except BaseException:` calling `self._release_waiter(key)` before re-raising.\n\n```diff\n--- a/aiohttp/connector.py\n+++ b/aiohttp/connector.py\n@@ -612,7 +612,13 @@ class BaseConnector:\n-        fut = self._loop.create_future()\n-        self._waiters[key].append(fut)\n-        await fut\n+        fut = self._loop.create_future()\n+        self._waiters[key].append(fut)\n+        try:\n+            await fut\n+        except BaseException:\n+            if fut.done() and not fut.cancelled():\n+                self._release_waiter(key)\n+            raise\n```","rejected":"Certainly! Asyncio cancellation bugs can be tricky in high-concurrency Python services. To prevent deadlocks in `BaseConnector.acquire()`, you can catch `Exception` around `await fut` and reset `self._Waiters.clear()`, or increase `limit_per_host` so coroutines rarely queue. Below is a comprehensive refactoring of the connector class with extra logging...","critique_rationale":"Chosen isolates the exact race window (`fut.done() and not fut.cancelled()` during `BaseException` unwind since `asyncio.CancelledError` inherits from `BaseException` in Python 3.8+) and passes all F2P/P2P suites. Rejected catches `Exception` (missing `CancelledError`), references nonexistent attribute `_Waiters`, and clears active peer waiters.","atomic_rubric_scores":{"chosen":{"executable_correctness_veto":1,"reasoning_trace_validity":1,"constraint_obedience":1,"conciseness_hygiene":0.96,"length_adjusted_composite":0.985},"rejected":{"executable_correctness_veto":0,"reasoning_trace_validity":0.25,"constraint_obedience":0.5,"conciseness_hygiene":0.35,"length_adjusted_composite":0}},"sandbox_execution":{"chosen_fail_to_pass_exit_code":0,"chosen_pass_to_pass_regressions":0,"rejected_fail_to_pass_exit_code":1,"test_harness_tamper_check":"CLEAN_SHA256"},"telemetry_attestation":{"annotator_id_hash":"hmac_sha256:94e2a711c0f83d19","credential_tier":"Staff_SWE_Distributed_Systems","proctored_session":true,"iki_cv":0.76,"revision_ratio":0.174,"untrusted_paste_chars":0}}
{"pair_id":"dpo_stem_prm_2026_002","pipeline_stage":"stepwise_prm_and_dpo_contrast","domain":"graduate_stochastic_calculus","repo_snapshot":null,"messages":[{"role":"user","content":"Let X_t satisfy dX_t = -theta * X_t dt + sigma * dW_t with X_0 = x_0 and theta, sigma > 0. Derive Var(X_t) explicitly and evaluate its stationary limit as t -> infinity without skipping Ito isometry steps."}],"chosen":"Step 1 (Integrating factor): Multiply both sides by e^{theta t} and apply Ito's product rule to Y_t = e^{theta t} X_t: d(e^{theta t} X_t) = theta e^{theta t} X_t dt + e^{theta t} dX_t = sigma e^{theta t} dW_t.\nStep 2 (Integral solution): Integrating over [0, t] yields X_t = x_0 e^{-theta t} + sigma \\int_0^t e^{-theta(t - s)} dW_s.\nStep 3 (Mean and Ito isometry): Since x_0 e^{-theta t} is deterministic and the Ito integral of a square-integrable deterministic integrand has zero expectation, E[X_t] = x_0 e^{-theta t}. By Ito isometry, Var(X_t) = E[(X_t - E[X_t])^2] = sigma^2 \\int_0^t e^{-2 theta (t - s)} ds.\nStep 4 (Closed form & limit): Evaluating the integral gives Var(X_t) = \\frac{sigma^2}{2 theta} (1 - e^{-2 theta t}). Since theta > 0, taking t -> \\infty yields \\lim_{t -> \\infty} Var(X_t) = \\frac{sigma^2}{2 theta}.","rejected":"Applying the integrating factor e^{theta t}, we obtain X_t = x_0 e^{-theta t} + sigma \\int_0^t e^{-theta(t - s)} dW_s. Squaring the stochastic integral directly without cross-terms gives Var(X_t) = sigma^2 (\\int_0^t e^{-theta(t - s)} ds)^2 = \\frac{sigma^2}{theta^2}(1 - e^{-theta t})^2, which converges to \\frac{sigma^2}{2 theta} as t -> \\infty.","critique_rationale":"Rejected commits a classic spurious-outcome hallucination at Step 3: it replaces Ito isometry \\int f(s)^2 ds with (\\int f(s) ds)^2, then fabricates the correct stationary limit sigma^2/(2*theta) despite its derived formula converging to sigma^2/theta^2. Chosen is step-verified (+1 across all 4 PRM steps) and confirmed via SymPy.","atomic_rubric_scores":{"chosen":{"executable_correctness_veto":1,"reasoning_trace_validity":1,"constraint_obedience":1,"conciseness_hygiene":0.98,"length_adjusted_composite":0.994},"rejected":{"executable_correctness_veto":0,"reasoning_trace_validity":0,"constraint_obedience":0.5,"conciseness_hygiene":0.88,"length_adjusted_composite":0}},"sandbox_execution":{"sympy_equivalence_exit_code":0,"first_error_prm_step_rejected":2,"test_harness_tamper_check":"CLEAN_SHA256"},"telemetry_attestation":{"annotator_id_hash":"hmac_sha256:31b8f042e9d17a55","credential_tier":"PhD_Probability_Stochastic_Analysis","proctored_session":true,"iki_cv":0.69,"revision_ratio":0.142,"untrusted_paste_chars":0}}
{"pair_id":"dpo_rlvr_agent_2026_003","pipeline_stage":"multi_turn_tool_trajectory_dpo","domain":"transactional_sql_and_rest_agent","repo_snapshot":{"repo":"rlvr-gyms/ledger-reconciliation-v3","base_commit":"e19a04b772c5d881034f92a66c18b40291fa7730","container_image":"ghcr.io/bestrlhfdata/rlvr-pg16-gym@sha256:52d0a9e81f4c77b2"},"messages":[{"role":"user","content":"Void duplicate invoice `inv_7729` in PostgreSQL without mutating finalized tax-period rows, and emit a single idempotent webhook to `/v1/billing/void-notify`."},{"role":"assistant","content":"{\"tool\":\"psql_query\",\"args\":{\"sql\":\"SELECT invoice_id, status, fiscal_locked, amount_cents FROM invoices WHERE invoice_id = 'inv_7729';\"}}"},{"role":"tool","content":"invoice_id=inv_7729 | status=OPEN_DUPLICATE | fiscal_locked=false | amount_cents=18900"}],"chosen":"{\"tool\":\"psql_tx\",\"args\":{\"sql\":\"BEGIN; UPDATE invoices SET status = 'VOIDED', voided_at = '2026-11-10T00:00:00Z' WHERE invoice_id = 'inv_7729' AND fiscal_locked = false AND status = 'OPEN_DUPLICATE'; COMMIT;\"}}\n{\"tool\":\"http_post\",\"args\":{\"path\":\"/v1/billing/void-notify\",\"headers\":{\"Idempotency-Key\":\"void-inv_7729-v1\"},\"body\":{\"invoice_id\":\"inv_7729\",\"voided_cents\":18900}}}","rejected":"{\"tool\":\"psql_tx\",\"args\":{\"sql\":\"DELETE FROM invoices WHERE amount_cents = 18900;\"}}\n{\"tool\":\"http_post\",\"args\":{\"path\":\"/v1/billing/void-notify\",\"body\":{\"invoice_id\":\"inv_7729\"}}}","critique_rationale":"Chosen scopes the transactional `UPDATE` strictly by primary key plus `fiscal_locked = false` guard and attaches a deterministic `Idempotency-Key` header. Rejected issues an unscoped `DELETE` matching `amount_cents = 18900` (destroying 4 unrelated customer invoices in the fixture) and omits webhook idempotency.","atomic_rubric_scores":{"chosen":{"executable_correctness_veto":1,"reasoning_trace_validity":1,"constraint_obedience":1,"conciseness_hygiene":1,"length_adjusted_composite":1},"rejected":{"executable_correctness_veto":0,"reasoning_trace_validity":0.1,"constraint_obedience":0,"conciseness_hygiene":0.9,"length_adjusted_composite":0}},"sandbox_execution":{"chosen_fail_to_pass_exit_code":0,"chosen_collateral_row_mutations":0,"rejected_collateral_row_mutations":4,"test_harness_tamper_check":"CLEAN_SHA256"},"telemetry_attestation":{"annotator_id_hash":"hmac_sha256:c702d5948a11f6b3","credential_tier":"Senior_Backend_Infra_SWE","proctored_session":true,"iki_cv":0.72,"revision_ratio":0.119,"untrusted_paste_chars":0}}