The dashboard lane, 7 October 2026 10:39Z: both slots of build-1 flock-held and EMPTY while two suites ran. Cause: a run from a
worktree without last night's append-mode fix opens a busy sibling's slot file with > on every probe. The holder now keeps its own
line: a keeper re-writes it within BR_KEEP_S (20 s) whenever the file is empty, until release; remote-run.sh --self-test-keeper
(in the gate) truncates a held line and sees it return, and sees nothing written after release; live on build-1 at 11:19Z (the
line came back in 25 s). The first version deadlocked the runner's bare wait with the keeper (build-2's first run hung 15 min
after its test passed): the keeper stops before the wait. The two running suites' -j 90 came from explicit --jobs 90: a bounded
class now clamps it to its cap with a log line (pass --priority gate for the full set). run-from-mac.sh --box N: the host file
was suffixed twice (build-server-2-2) and every box's mirror would have shared one remote name; one remote per box (build-N).
build-2's first green run: a suite at nice 10 on 32 cores, jobs 32, 986 s cold.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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