main is red on 6b4dd54f #298
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jeroen/cartopolis#298
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Problem
mainis red at6b4dd54fbecause theHeadless flicker smoke (street)step in thetest cartopolisjob runs out of wall-clock time. Every unit suite passes; nothing fails an--expect.The step is
.forgejo/workflows/ci.yml:472-489, withtimeout-minutes: 15at.forgejo/workflows/ci.yml:474.--flickercaptures the viewpoint twice, ~5 cm apart. In the failing runs the first capture's PNG lands at ~10½ minutes and the second never finishes; the runner kills the step at 900 s and logs⚙️ [runner]: context deadline exceeded.The job-log ids returned by
/actions/runs/{n}/jobsdo not match the logs served by/actions/jobs/{id}/logs— the log for job1331isb5a9c9ad, not6b4dd54f. The correct log for6b4dd54fis job 1352; verify by grepping the log'sfetch … +<sha>:refs/remotes/origin/mainline before trusting it.This is not a flake. Measured from each log — step start (
Running \target/debug/cartopolis --shot /tmp/flicker.png …`) to eitherflicker pair measuredor the runner kill, at the identical pinned viewpoint (53.2194,6.5665,100`, noon, clear, dry, 640×360):settled_in(shot 1)frame_msfetch_mb6473ddb1856f666bae198d53b0e2a24ecd5d1b84dcfa1426cargo fmt)b5a9c9ad5d2e20b16b4dd54fTwo things happened, and neither alone is the whole story:
fetch_mbgoes 79–88 → 138–141 with no overlap, across three consecutive runs of the same pinned viewpoint. The commit at that boundary is13777216 perf(map): bound, order and share the per-cell streaming path(dcfa1426→ [1377721] →b5a9c9ad;b5a9c9aditself is a whitespace-onlystyle(sun)change). The same boundary showsfetch_errors3 → 13 andworker_split'slod22busy time 9.1 s → 17.9 s.5d2e20b1and6b4dd54f:grass_patches145 → 209,grass_slots1,511,680 → 2,403,904,draws1275 → 1302,frame_ms2837 → 3181.And the budget never had margin. The worst green run used 854 s of 900 — 5 % headroom. Fixing (1) alone puts the gate back to roughly where it was, i.e. one heavy commit from red again.
Why the capture can overrun a wall-clock timeout at all: the harness's
--wait 120and--settle 2are counted on the virtual clock (shot_harness.rs:2514andshot_harness.rs:2630both accumulatetime.delta_secs(); the settle test isshot_harness.rs:2635), which Bevy clamps atmax_delta= 0.25 s. At 3.18 s/frame that is ~12.7× wall, so--wait 120permits ~25 minutes per capture and--flickerdoubles it.QUIESCE_MAX_S(shot_harness.rs:138, compared atshot_harness.rs:2683) is measured on the same virtual clock. Only the frame-time readouts useTime<Real>(shot_harness.rs:2522). There is no wall-clock ceiling anywhere in the harness, and adding one is out of scope —docs/notes/headless-shots-software-renderer.md:142already documents this and records that switching to real time was considered and rejected as "a deliberate trade rather than an oversight", because it would make every CI capture less complete for the same flag values.Leading hypothesis for (1), not established.
1377721added a promotion sweep tolod22: cells in the outermost ring are built without door panels and rebuilt when they come closer (lod22.rs:635-664), with the built detail recorded at dispatch (lod22.rs:697-698) and the boundary atlod22.rs:105-112.docs/notes/streaming-order-and-residency.md:76-80claims a promotion needs the camera to cross a whole cell boundary. A--shotcamera is static after placement, so a static capture should see zero promotions — yet lod22's worker time doubled and the byte count rose by ~53 MB at that commit, which is about what re-fetching a 5×5 ring of 3DBAG cells costs.radius_bias=0in every dump, soload_control(load_control.rs:152-160) is not moving the ring. Other candidates in the same commit:systems::cell_bundle's "one 404 per covered cell until it latches off", and the globalplatform::fetch_gatecap (fetch_gate.rs:79-87). Confirm before fixing — the implementer should not take this paragraph as the diagnosis.Approach
Two parts. Part 1 is the cause; part 2 is why the gate stayed one commit away from red for a month.
1 —
crates/cartopolisstreaming path. Find what13777216made fetch ~53 MB more at a static viewpoint and remove it. Start by reproducing the flicker capture at6b4dd54fand again with the promotion sweep short-circuited (makedoor_detailinlod22.rs:110-112returnNearunconditionally) and diffingfetch_mb/worker_splitfrom--dump-state. If that accounts for the bytes, the fix belongs inlod22.rs's promotion filter (lod22.rs:635-644) — a cell must not be promotable against the samering_distanceit was dispatched under. If it does not, work throughsystems/map/cell_bundle.rsandplatform/fetch_gate.rsnext. Whatever is found, correctdocs/notes/streaming-order-and-residency.md:76-80, whose claim the CI evidence contradicts.2 —
.forgejo/workflows/ci.yml. Re-size the flicker step's budget from the post-fix measured worst case rather than leaving it at a number that was already only 5 % clear. Do the same review for the two sibling steps that carry the same 15 minutes (ci.yml:436-438,ci.yml:510-512) — neither is failing, but neither number was derived either. Record the measurement and the headroom indocs/notes/headless-shots-software-renderer.md, which already owns this renderer's timing facts.Also in
ci.yml: on atimeout-minuteskill the step's|| { … cat /tmp/flicker.json … }block (ci.yml:483-488) never runs, so a red run hands back no metrics at all — which is most of why this ticket cost a log-archaeology session. Put the run under a shelltimeoutslightly under the step budget so the dump is printed on the slow path too.Acceptance criteria
fetch_mb88 → 141 at the flicker viewpoint is identified and named in the commit body, with the before/after--dump-statenumbers that show it.6b4dd54f's viewpoint reportsfetch_mbback in the 79–88 range (± the genuine content added by5d2e20b1and6b4dd54f, stated explicitly if it is not).docs/notes/streaming-order-and-residency.md:76-80either states a property that now holds, or says plainly what it got wrong and when.timeout-minutesis set from a measured worst case with the headroom stated in a comment, not left at an unexamined 15.timeout-killed flicker step prints/tmp/flicker.json(or says the run died before capturing) instead of ending on a barecontext deadline exceeded.cargo test -p cartopolisandcargo fmt -p cartopolis -p cartopolis_geo -p cartopolis_core -p cartopolis_simulator -p cartopolis_android --checkpass.test cartopolisjob is green onmain, with the flicker step reachingflicker pair measuredandflicker_px <= 1500.Verification
The numbers to read out of
/tmp/flicker.jsonand theshot statelog line:fetch_mb,fetch_count,fetch_errors,worker_split(thelod22:andsurfaces:fields),settled_in,frame_ms, and the wall time from the firstcamera placedline toflicker pair measured.To fetch a CI log for comparison, probe
/repos/$FORGEJO_REPO/actions/jobs/<id>/logsand confirm the SHA in the log's fetch line — the ids from/actions/runs/{n}/jobsare wrong. Known-good ids:1352=6b4dd54f(red),1319=cd5d1b84(last green flicker run),1324=dcfa1426(last green flicker step).Cost and environment. This container does render — lavapipe is present at
/usr/share/vulkan/icd.d/lvp_icd.json, contradicting the "cannot render" line in the refinement brief and the stale claim in the global instructions. But one flicker capture is ~11–15 minutes on top of a debug build ofcartopolis, the box is shared with nominatim/overpass/other agents, andrenders share the box— concurrent captures make the timings meaningless. Budget for it and run one at a time. Colour, exposure and lighting are not evidence here; geometry, byte counts and timings are.The only thing that cannot be checked locally is the final criterion:
maingoing green needs a real CI run after the merge.Out of scope
--wait/--settlecount real seconds. Already considered and rejected —docs/notes/headless-shots-software-renderer.md:142.13777216. It fixes real handset problems (the 991 MB → 371 MB residency work); the ask is to find and remove the specific regression, not to undo the commit.grass_slotsanddrawsgrowth from5d2e20b1and6b4dd54f. That is ~12 % of frame time and is content the map is meant to have; it is context for the budget, not a defect to fix here.wasm & android targetsjob, which is red only because itneeds: test.404s at z3 in the orbit smoke (tiles.cartopolis.org/tiles/osm/3/*/7). Present in green runs too; not this failure.Open questions
None blocking.
Branch:
fix/298-flicker-smoke-overruns-budgetOriginal request
The last commit on
mainthat CI ran for is6b4dd54f, and it did not pass:test cartopolis— failureNothing can be deployed while this stands —
tools/deploy-maingates on it — so thiscomes before anything on the frontier.
Read the failing job's log, reproduce it locally, and fix the cause. If the failure is
the runner rather than the code (a flake, a cache miss, a missing tool), say so on this
ticket and close it rather than changing code to suit it.
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🤖 Refining this before anything gets built — reading the code, no branch, no commits. If it turns out I'd have to guess at the requirements I'll stop and ask instead.
🤖 Refined. The description above is now the spec; I'll pick it up for implementation on the next poll.
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alreadyFiledonly ever sees 50 issues, so every autopilot dedupe key silently expires — #206 was QA'd twice #281No longer reproduces: on current main
e3ea1346,cargo test --locked --workspace --exclude cartopolis_androidexits 0 andcargo fmt --checkover the five owned crates exits 0 (nightly run, 2026-09-26 23:5x UTC, slot vps-1). Closing.