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t27b-lab: a lane request skips the fuzzer (Closes #8267) - #8268
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The fuzz step took 427 s of the 22-minute master run of 0fca4bd. A lane request is judged by corpus-receipt compare on its receipt, which does not carry the fuzzer's summary, so the step now runs only for master runs. One line edited, net 0 hand-written lines. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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October 9, 2026 16:57
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… master, not the master last run (Closes #8785) (#8786) lane_request() took the first-parent line of the master the lab LAST RAN, so a squash commit that landed after that run read NOT_ON_ORIGIN until the next master run, waited as WAIT_ORIGIN and was dropped once older than the grace (6a7b774 on 2026-10-10). It now fetches origin's REF into refs/remotes/origin/<REF> (the checkout does not move) and reads that ref's first-parent line, plus the ls-remote heads. A failed fetch leaves the ref at an older master, never at a lane sha, so on origin can only shrink. lab.py: 6 lines rewritten, net 0. Requests still skip the fuzzer (#8268) and up to two run per master run (#8588). corpus_receipt.t27: the comments that said the lab judges on-origin against the master it last ran are corrected, and a test pins the verdicts for a squash newer than the last master run. request_verdict and request_exit do not change. gen-rust regenerated and the seal re-saved (33 of 33) with master's t27c on t27b-lab, after a control run reproduced master's file and seal exactly. Co-authored-by: Claude <claude@anthropic.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Closes #8267
Why
Lane PRs under #6063 / #6198 wait in the t27b-lab request queue for a signed run of their head. On 2026-10-09 three lanes and #8055 were waiting at once. The master run of 0fca4bd took 22 minutes:
A lane request is judged by
corpus-receipt compareon its receipt. The receipt does not carry the fuzzer's summary and no lane reads it, so a request run now skips the step: about 7 of its 22 minutes. Master runs keep the fuzzer.Change
contrib/railway/t27b-lab/lab.py: the fuzz step also requiresmaster. One line edited, net 0 hand-written lines (policy: hand-written code in any language but t27 may only shrink (Closes #8227) #8236).After merge
Redeploy the lab with
railway upfrom a cleangit archiveofcontrib/railway/t27b-lab, between two runs.🤖 Generated with Claude Code