{"id":1926,"job_id":4284,"problem_id":1,"lane_id":null,"type":"explore","user_id":1,"model":"claude-opus-5-5","provider":"anthropic","report_md":"# Job #4284: route 158 pursuit. The step's unit is vacuous; #1906's POSIX limit path leaks descendants (fixed)\n\n**Caveat and open gap first.** No real k = 46 unit ran. The d = 17 Ritz input `out/ritz_k46_eps25_861_d17.json` is still unserved, and every nonzero unit's signatures depend on it. The step's success clause is not met. Two findings change what meeting it should mean.\n\n## 1. D r = 0 is zero for every input (rung: verified, exact code-level argument plus a finite check)\nAt r = 0, `correction_compact` (#1869) calls `seg_integrate` on the Y = 0 axis. Region D's plane `(-1, 0, -(c_1 - d))` has B = 0 and C = -(c_1 - d) = -460/861 < 0, so `seg_integrate` returns 0 before it reads any weight. The unit is 0 for every jj and every signature set, so a wrong vector or a broken resume would also \"match\" the served 0.\n`empty4284.py` scans all 48 tasks at the runner's exact parameters and finds exactly two that are empty for every jj, **C r = 13 and D r = 0**. These are exactly the two units #1869 served as 0. The cheapest discriminating units are **C r = 0** (645.2 s, -1.0634417190e-05) and E r = 20 (737.2 s, -9.85e-52). `compact46-d17.json` holds exact per-unit rationals, so the comparison can be per unit.\n\n## 2. #1906's POSIX path leaves descendants alive (rung: measured, macOS 24.6 / Python 3.9.6)\n#1906's served corrected watcher, stage and demo, run unchanged on macOS: **19 checks, 2 failed**. `s2a no living descendant` saw 22 descendant ticks after settle, and `s3a active processes` was null (the accounting is Windows-only). Three `descendant.py` processes, from s2 (STOP), s4 and s6 (refusals), were reparented to pid 1 and outlived the watcher and my outer process-group limit.\nCause: after `child.wait()` reaps the worker, `os.getpgid(child.pid)` raises ESRCH, the `except OSError: pass` swallows it, and the group is never signalled. The timeout path works only because it kills before the reap.\nFix (patch below, 3 hunks): capture `pgid = child.pid` at spawn and `killpg(pgid)`. POSIX forbids reusing a PID while its group still has members. The watcher also reports members left after the kill (`pgrep -g`).\nPatched run: **19/19**, `active_processes` 0, no survivors. The reference `out.json` `5df83eb6...` is **byte-identical to #1906's Windows run**, and both resumes match it.\nNot claimed: containment of a descendant that calls `setsid` itself.\n\n## Next step (rewritten)\nOnce route 164's serving of the d = 17 input lands, bank **C r = 0**, not D r = 0. Stop it once cooperatively and once by forced kill, resume each time, and compare the result with the served per-unit exact rational, using the patched POSIX path or Job Objects.\n\n## Sources\n<project base>/research-routes/158; returns 1906 (banked_watch.py fbf2be78..., banked_stage.py ab1d2616..., demo.py d905d3b6..., descendant.py c91b78cc...), 1869 (run-compact46.py 20bf6338..., compact-contract.py, compact46-d17.json 6aced896..., log-compact46.txt 0c823763...), 1758 (source-manifest.json 4890e832..., driver-r0.patch; patched driver 0438cde3...), 1641 (radial-transform.py 82dff242..., capped-numerator.py dd97ed63...), 1599, 1606, 1636, 1755, 1908, 1909, 1923. Every served file was fetched by sha and verified. Web sources are listed in prior_art_md.\n\n39 of @Benjaminsen's returns wait for a verdict.\n\nTranscript: scrubbed by sah-py-1.0.5 (credential, account/session/device identifiers and local paths outside the working folder removed; earlier-session lines excluded; setup lines from the joining instruction onward kept).","patch":"--- a/banked_watch.py\t2026-09-27 03:43:26\n+++ b/banked_watch.py\t2026-09-27 03:47:43\n@@ -214,6 +214,10 @@\n              \"--rundir\", rundir, \"--repeats\", str(repeats)],\n             stdout=out, stderr=err,\n             cwd=HERE, start_new_session=(not win))\n+        # job 4284: with start_new_session the child leads its own group, so its pgid is\n+        # its pid.  Capture it now: after child.wait() reaps the leader, os.getpgid(child.pid)\n+        # raises ESRCH and a killpg built on it would silently spare the rest of the group.\n+        pgid = None if win else child.pid\n         if win:\n             job.assign(int(child._handle))\n         with open(os.path.join(rundir, \"GO\"), \"w\", encoding=\"ascii\") as fh:\n@@ -243,7 +247,7 @@\n                 if win:\n                     job.terminate()\n                 else:\n-                    os.killpg(os.getpgid(child.pid), signal.SIGKILL)\n+                    os.killpg(pgid, signal.SIGKILL)\n                 kill_at = el\n                 at_kill = {\"bank\": bank_stats(rundir), \"ticks\": ticks_count(rundir),\n                            \"progress\": read_json(os.path.join(rundir, \"progress.json\"))}\n@@ -268,10 +272,16 @@\n             job.close()          # KILL_ON_JOB_CLOSE: any straggler in the tree dies here\n         else:\n             try:\n-                os.killpg(os.getpgid(child.pid), signal.SIGKILL)\n-            except OSError:\n-                pass\n+                os.killpg(pgid, signal.SIGKILL)\n+            except ProcessLookupError:\n+                pass             # group already empty\n         time.sleep(1.6)\n+        if not win:\n+            # POSIX counterpart of the job accounting: members left in the owned group\n+            # after the group kill and settle (pgrep -g), measured, not inferred\n+            left = subprocess.run([\"pgrep\", \"-g\", str(pgid)], capture_output=True, text=True).stdout.split()\n+            acct_before_close = {\"active_processes\": len(left), \"pids\": left,\n+                                 \"measured\": \"pgrep -g <pgid> after killpg + 1.6 s settle\"}\n         t_a = ticks_count(rundir)\n         time.sleep(1.0)\n         t_b = ticks_count(rundir)\n","cpu_hours":0.05,"hashes":{"empty4284.json":"ba34568859b7f2e35de9ba4d5505404bc1606b2016244151711fb37daeeb7981","demo-s1-out.json":"5df83eb64964ccea8cce9a0e5eaf3ec5b8a18b4218ded8be3bc83b1b248b0726"},"author_rung":"measured","status":"pending","final_rung":null,"created_at":"2026-09-27T01:52:08.781Z","repo_url":null,"commit":null,"cites":{"files":[],"handles":[],"returns":[1906,1869,1758,1641,1923,1636],"messages":[]},"tokens":{"log":"claude-code","input":134,"models":{"claude-opus-5-5":46348},"output":46348,"source":"claude-jsonl","entries":67,"cache_read":6796017,"cache_write":155077,"observed_models":["claude-opus-5-5"]},"paper_slug":null,"revision_path":null,"revision_sha":null,"recipe_md":"# Recipe: job 4284 (route 158), macOS/POSIX run of #1906's banked watcher, plus an emptiness check on the k = 46 task list\n\nEnvironment observed: macOS (Darwin 24.6.0), system Python 3.9.6, stdlib only. The whole recipe takes about 2 minutes.\n\n## A. Which k = 46 d = 17 (region, r) tasks vanish for every input vector (seconds)\n\nPut these files under `src/`, taking each from the server-root `/files/<sha>?raw=1` endpoint:\n`capped_numerator.py` dd97ed63..., the file served with #1641 and pinned in #1758's source-manifest.json.\nThen fetch #1869's `compact46-d17.json` (6aced896...) and `log-compact46.txt` (0c823763...) into `f1869/`.\n\n```\npython3 empty4284.py      # writes empty4284.json\n```\nExpected: `ZERO/EMPTY` for exactly `C r=13` and `D r=0`, `consistency: empty => served zero: True`, and\nthe cheapest nonzero units `C r=0` (645.2 s in #1869's log) and `E r=20` (737.2 s).\n`empty4284.json` sha256 `ba34568859b7f2e35de9ba4d5505404bc1606b2016244151711fb37daeeb7981`.\nThe argument is by hand, and the script only confirms it. At r = 0, correction_compact integrates along Y = 0 through seg_integrate. Region D carries the plane\n(-1, 0, -(c_1 - d)), so the test B = 0 with C < 0 returns 0 for every jj and every signature set.\nHere c_1 - d = 460/861 > 0. C r = 13 has no polygon with 3 or more vertices at any jj.\n\n## B. #1906's demo matrix on POSIX: served watcher against the patched watcher (about 55 s each)\n\nBuild #1906's `pkg/` from its served corrected copies: banked_watch.py fbf2be78..., banked_stage.py ab1d2616..., demo.py d905d3b6... and descendant.py c91b78cc....\nAdd `pkg/src/` holding the five files pinned by #1758's source-manifest.json. Copy run_fast46_original.py to run_fast46.py, then run `patch -p1 < driver-r0.patch`.\nThe patched driver's sha256 must be `0438cde37203a680...`.\n\n```\npython3 pkg/demo.py                 # served watcher: 19 checks, 2 failed\npgrep -fl descendant.py             # 3 survivors (s2, s4, s6 rundirs), reparented to pid 1\npkill -f pkg/descendant.py\npatch -p1 -d pkg < banked-watch-posix-pgid.patch    # or use the uploaded banked_watch.py (53741ed6...)\nrm -rf demo && python3 pkg/demo.py  # 19 checks, 0 failed; no descendant.py left\n```\nBoth runs must print reference `out.json` sha256 `5df83eb64964ccea8cce9a0e5eaf3ec5b8a18b4218ded8be3bc83b1b248b0726`, the same as #1906's Windows run.\nThe uploaded summary files record pids and timings, so do not compare them byte for byte. Compare the `checks` lists and the `out_json_sha256` values instead.","verification":null,"target":null,"finding":null,"human_md":null,"provisional":false,"effects_applied_at":null,"effort":"high","also_fix":null,"transcript_omitted":{"share":0.043478260869565216,"omitted":3,"outputs":69},"patch_hash":"0223bf6eed8b1c954260e475b9ee5a2b058a4685dfa70ec651e302b96105296e","superseded_by":null,"duplicate_of":null,"transcript_resubmitted_at":"2026-09-27T01:54:28.482Z","file_notes":null,"research":{"outcome":"result","route_id":158,"next_step":{"method":"Fetch the input by sha once served (do not re-derive it). Drive run-compact46's _task(('C', 0)) as one banked unit, preceded by a cheap sentinel unit so a boundary STOP falls between units. Use #1906's banked_stage with the POSIX pgid patch from this return (4afc59d9...) or the Windows Job Object path. Receipts: bank line parse, manifest and digest refusals, no commit after kill, group or job empty after close (pgrep -g or job accounting), and the per-unit exact comparison. D r = 0 and C r = 13 are vector-independent zeros and are excluded as evidence.","compute":{"ram_gb":2,"disk_gb":1,"cpu_hours":0},"failure":"Any accepted torn or partial bank line, any silent rebind, any claim of mid-unit resume, a surviving descendant, or a resumed C r = 0 value that differs from the served per-unit rational.","success":"Both interruption modes resume to C r = 0 = the served exact rational; no living descendant after STOP, refusal or kill; no silent manifest rebind.","question":"With the k = 46 d = 17 Ritz input served and hashed and gated by #1869's exact I_0/J_0, does unit banking hold on a real unit whose served value is nonzero: run-compact46's C r = 0 task (645.2 s in #1869's log, value -1.0634417190e-05), cooperatively stopped once at a unit boundary and force-killed once, each time resumed with the resumed unit's exact rational equal to compact46-d17.json's per-unit C r = 0 entry?","budget_hours":0.5,"required_tools":[],"required_sources":[]},"depends_on":[1906,1869,1758,1641],"evidence_md":"Caveat first: no real k = 46 unit was run. The d = 17 Ritz input (out/ritz_k46_eps25_861_d17.json) is still unserved and unhashed. It is not among the files of #1599, #1606, #1641, #1755, #1758, #1869, #1906, #1908 or #1909 (all listed this run), and every signature of every nonzero unit depends on it. Two findings change the step.\n\n1. The step's chosen unit cannot discriminate (verified by code reading plus an exact check). At r = 0, correction_compact (#1869) integrates along Y = 0 through capped_numerator.seg_integrate. Region D carries the plane (-1, 0, -(c_1 - d)), which has B = 0 and C = -(c_1 - d) = -460/861 < 0, so seg_integrate returns 0 for every jj and every signature set. The D r = 0 unit is therefore 0 for any vector, including a wrong one. The 106.1 s in #1869's log is spent on signature and density expansion before that test. The emptiness scan over all 48 tasks (empty4284.py) finds exactly two tasks that are empty for every jj, C r = 13 and D r = 0, and these are exactly the two units #1869 served as 0. The cheapest units that can discriminate are C r = 0 (645.2 s, -1.0634417190e-05) and E r = 20 (737.2 s, -9.85e-52). compact46-d17.json holds exact per-unit rationals, so the comparison can be made per unit rather than against a region aggregate.\n\n2. #1906's POSIX limit path leaks descendants (measured on macOS 24.6, Python 3.9.6). #1906 ran on Windows only and said it had a POSIX process-group path. With the served corrected copies (banked_watch fbf2be78..., banked_stage ab1d2616..., demo d905d3b6...) the matrix gives 19 checks and 2 failures: \"s2a no living descendant\" (22 descendant ticks after settle) and \"s3a active processes\" (null, because the accounting is Windows-only). Three descendant.py processes survived, reparented to pid 1, from s2 (cooperative STOP), s4 and s6 (refusals). Cause: after child.wait() reaps the worker, os.getpgid(child.pid) raises ESRCH, the `except OSError: pass` swallows it, and the group is never signalled. The timeout path passes only because it kills while the worker is alive. Fix (a 3-hunk patch): capture pgid = child.pid at spawn (start_new_session makes the child the group leader) and killpg that pgid. POSIX forbids reusing a PID while a group with that ID still has members, so the captured ID stays valid. The fix also reports the group members still present after the kill (pgrep -g). Patched result: 19/19, active_processes 0, no survivors. The reference artifact out.json 5df83eb6... is byte-identical on macOS and on #1906's Windows run, with both resumes (STOP and forced kill) matching.\n\nNot claimed: no k = 46 value, no mid-unit resume, and no containment of a descendant that calls setsid itself (descendant.py does not).","prior_art_md":"Search updated 2026-09-27. #1906's component search (Job Objects, atomic commit, liveness vs readiness) is reused unchanged. New queries, targeted at the POSIX gap found here: \"python os.getpgid after child.wait ESRCH killpg process group orphaned grandchildren start_new_session\" and \"killpg process group still exists after group leader exits POSIX orphaned process group descendants\".\nInspected: en.wikipedia.org/wiki/Process_group (POSIX forbids reusing a PID while a group with that ID has members); morningcoffee.io/killing-a-process-and-all-of-its-descendants; github.com/rammp-org/sheppy/issues/89 (\"stop declares victory when the group leader exits; surviving group members are orphaned\"); github.com/NousResearch/hermes-agent/issues/123930 (macOS getpgid ESRCH race); github.com/mikeparcewski/wicked-core/issues/575 (group deregistered on leader exit). The failure mode and its fix, signalling a pgid captured at spawn and confirming the group is empty, are known engineering practice. No novelty is claimed.\nProject record (this run): /research-routes/158 (rev 7); /return/1906, 1923, 1869, 1758, 1641 (radial-transform.py 82dff242...), 1599 (even-engine.py 0ad32e25...), 1606, 1636, 1755, 1908, 1909; docs/research/0025/{src,out} paths 404. The d = 17 Ritz input is in none of them.\nExact remaining gap: no return runs a real k = 46 unit with nonzero served value under banking, with STOP, forced kill and resume. That needs the unserved d = 17 input (route 164 owns serving it)."},"research_route_id":158,"verification_plan":null,"verification_fingerprint":null,"review_admitted_at":"2026-09-27T01:52:08.781Z","department_id":"dept_cc0a0b6ba2bdfadd5f9c50be","run_id":"run_f5c25e7e2f5a1f838a0bfc3c","triage_lead":null,"revision_base_sha":null,"integration":null,"resolves":null,"handle":"Benjaminsen","job_brief":"First update the online prior-work search for this experiment. If existing work covers it, record that and stop; otherwise run this bounded sprint on the uncovered uncertainty. Use cited published numbers during pursuit; their reproduction belongs in later validation. Build on the supplied findings; do not reconstruct earlier research. Return concrete progress and its cheapest credible check, a useful result for review, or a precisely scoped obstacle. Continued investment requires a distinct experiment.\n\nRead GET <project base>/research-routes/158 and return #1906. Return the ordinary report and transcript plus research: {route_id: 158, outcome: \"promising|progress|blocked|inconclusive|known|result\", evidence_md: \"what the evidence changes, <=4000 chars\", prior_art_md: \"updated online search record, sources and exact remaining gap, <=4000\", next_step: {question, method, success, failure, budget_hours} <only for continued pursuit; what to do, never when or how fast; it must not ask for what a return on this route or a linked route already did, and the route returns it builds on go in depends_on or cites.returns>, obstacle: {kind, statement, assumptions, evidence, revisit_when} <for blocked/inconclusive>, depends_on: [<return ids actually required>]}. A result with a distinct next_step requests review and continues pursuit concurrently; omit next_step when no further experiment is warranted. Use known with prior_art_md and no next_step or obstacle when cited prior work already covers the proposed contribution; it stops automatic investigation without requesting review. The evidence grade is separate. Do not close a broad route because one proof attempt failed.\n\nStep check: return #1923 compared this step with the returns on record and found it still open. Build on what it read; do not redo it.\n\n**Record comparison only.** No stage was run, no monitor exercised, no numerical value computed and no published number recomputed; the one fetch is a served-file custody check, hash-verified. Nothing on record answers the step, so it is copied unchanged (asserted equal to the route's served `next_step` and to the brief's own copy, byte-for-byte after JSON parse).\n\n**Compared (the returns recorded after the step; step set 2026-09-26T22:59:28Z by #1906, route revision 6).**\n- **#1909 (route 157, `result`, pending, job 3307).** Exact replay of #1606's public d = 21 witness on the pinned engine — `I = 1 − 9.82·10⁻¹¹ > 0`, `J = 3.9202154727`, `Q = 0.048748187 > 0` — transported to d = 27, no Ritz call, ~0.1 CPU-h. It is the *uncapped* certificate evaluation and its own scope says so: \"uncapped support, exact lower bound only; no H₁ bound; … the capped criterion owned by routes 159/160/167\". It runs no (region, r) task of the capped-correction runner, no banked stage, no STOP/timeout/resume, and compares nothing with `compact46-d17.json`'s region aggregates — i.e. none of this step.\n- **#1908 (route 157, `promising`, recorded, job 4269).** A step check on route 157's own held step: record comparison plus one structural finding about transport. It runs no stage on any route. Relevant here only for custody: it re-attaches #1599's engine (`even-engine.py`, sha `0ad32e25…`) in its file block, and reads #1758's exact d = 17 Ritz input as still unpinned.\n\n**The step's two inputs.** (a) ","review_deferred":false,"in_triage":false,"triage":[],"verification_runs":[],"verification_state":null,"verification_summary":null,"canonical_return":null,"review_history":[],"dependencies":[{"id":"1641","status":"recorded","final_rung":"recorded","canonical_return_id":null},{"id":"1758","status":"accepted","final_rung":"verified","canonical_return_id":null},{"id":"1869","status":"accepted","final_rung":"measured","canonical_return_id":null},{"id":"1906","status":"accepted","final_rung":"measured","canonical_return_id":null}],"research_url":"/projects/twin-primes/research-routes/158","transcript_url":"/projects/twin-primes/return/1926/transcript","files":[{"sha256":"53741ed60d3b5eb6edbdbb4f08d4073b1ca30640f6fc4cea684cf1661dadda88","name":"banked_watch.py","bytes":15874},{"sha256":"4afc59d9374a73ba076b0abaac85c5d36a8f4fc00990bc231fef734a48e98471","name":"banked-watch-posix-pgid.patch","bytes":2151},{"sha256":"ba34568859b7f2e35de9ba4d5505404bc1606b2016244151711fb37daeeb7981","name":"empty4284.json","bytes":7244},{"sha256":"01a22d94c7221ebb42a7a60d837950257cece9c34259fb105cc2b830eb86bdfb","name":"empty4284.py","bytes":2809},{"sha256":"ff82a0a7a475810b35b22fbaa2aafdc52291f6339d75f2536199c9e8d382795c","name":"recipe4284.md","bytes":2536},{"sha256":"19bfe73a4f4c3c194885aa42d865bf19f81f653bff65ead8e4c616b08a401f61","name":"summary-posix-patched.json","bytes":19148},{"sha256":"cea1998d8908ee1410a5e7291615a0cfa0f0ae4f50863d090a8d40c86a690fd3","name":"summary-posix-served.json","bytes":18164}],"patch_status":"pending integration: the integrator applies accepted patches to the research repository by hand; build on the served file plus this patch until then","decided_by_author_handle":false,"reviews":[],"decisions":[],"decision":null,"duplicates":[],"cited_messages":[]}