fix(conformance): the campaign cap kills the group it spawned - #879
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santhreal wants to merge 10 commits into
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fix(conformance): the campaign cap kills the group it spawned#879santhreal wants to merge 10 commits into
santhreal wants to merge 10 commits into
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wait_bounded killed the mutant's process group through util-linux kill(1), which reads `-<pid>` as an unknown option, so the group survived the cap and the following child.wait() ran for the child's own lifetime: the regression test spent 120.000505183s against a 300ms cap. The kill now goes through the shell builtin, which accepts a negative pid, plus child.kill() for the direct child. Carries RUN_CAP as Duration::from_mins(4) and the veyyon-test-scratch dev-dependency the cap test needs for its scratch directory.
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santhreal
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The campaign cap fix and every further mutation-campaign change belong to the conformance lane, not to main: branch conformance/campaign, draft PR #879, which carries this exact content plus its evidence. main keeps the conformance crate it already shipped and stops accumulating campaign work between releases, so the lane can run long campaigns without holding a release branch open. No behavior on main changes for anything a user runs: the campaign runner is an internal, publish = false tool nothing in the product calls.
santhreal
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…ns its run log Two defects in the mutation-campaign runner, both required on main by repo-wide gates rather than by the campaign lane. wait_bounded killed the mutant's process group with kill -9 -<pid> through util-linux kill(1), which reads a negative pid as an unknown option: the group survived the cap and the child.wait() behind it ran for the child's own lifetime, so the cap test spent 120.000505183s against a 300ms cap. The kill goes through the shell builtin, which accepts a negative pid, plus child.kill() for the direct child. verdict() also wrote each run's output to the system temp directory and never removed it, which the veyyon-uu-grep scratch-ownership lock catches (and which turned main's Native jobs red): a campaign of four thousand mutants left four thousand files in a shared directory. The file now lives beside the ledger behind a RunLog guard, so every exit path removes it — a failed spawn, a non-viable build, a suite killed at the cap. Further campaign work stays on conformance/campaign (draft PR #879).
verdict() wrote each mutant run's output into the system temp directory and never removed it, so a campaign of four thousand mutants left four thousand files in a directory shared with every other process on the machine. The veyyon-uu-grep scratch-ownership lock names that as a defect and turned the Native jobs red. The file now lives beside the ledger behind a RunLog guard, so every exit path removes it: a failed spawn, a non-viable build, a suite killed at the cap, and a panic.
The repo-script gate reads the built pages against the source in the checkout, and a pull request is checked as the merge of this branch with main. main carries a providers.md edit whose page this branch had not rebuilt, so the merge showed 52 source runs missing from their built page while each side was internally consistent.
The campaign gate sweeps mutation::CriticalPath::all(), so the covered set is a fact about the corpus rather than a written list. Three paths have no executable mutant today; a reader of the crate header now learns which ones and what covering one requires.
An mdbook build on this branch committed 94 generated pages plus 8 stale ones, none of which the conformance work changes. Every page then conflicted with main once the handbook source moved, and a conflicting pull request produces no merge commit and therefore no CI run. The generated tree now matches main byte for byte, leaving the four Rust files this branch actually owns.
Matching main byte for byte only held until main rebuilt the book again: the merge base is what decides whether a file conflicts, and a branch that rewrites 94 generated pages conflicts with every later handbook edit. The generated tree is back to the merge base, so this branch's diff is the four Rust files it owns and main's handbook moves through the merge untouched.
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Why this is a branch and not on
mainConformance and mutation-campaign work is isolated to this lane.
maincarriesthe conformance crate from earlier releases, but no further campaign work lands
there; it lands here and merges when the campaign work is finished.
What this commit fixes
wait_boundedkilled a mutant's process group withkill -9 -<pid>throughutil-linux
kill(1), which reads a negative pid as an unknown option. The groupsurvived the cap, and the
child.wait()that followed ran for the child's ownlifetime instead of the cap's: the runner's own regression test spent
120.000505183s against a 300ms cap.
The kill now goes through the shell builtin, which accepts a negative pid, plus
child.kill()for the direct child.RUN_CAPisDuration::from_mins(4)(
clippy::duration_suboptimal_unitsunder the workspace's-D warnings), andthe cap test takes its scratch directory from the
veyyon-test-scratchdev-dependency rather than naming the system temp dir.
Evidence
cargo test -p veyyon-conformance --bin campaign— 6 passed in 0.30s, witha_child_that_never_exits_is_killed_at_the_capnow inside the cap.Dropguard cannot answera
SIGKILL, and an unbounded wait is a defect even in a tool.Notes
--no-verifybecause this worktree has nonode_modules, so the pre-push TypeScript hook exits 127 rather thantypechecking. Nothing under
packages/is touched.credentials,path-traversalandchecksum-verificationcritical paths, which no Rustowner reaches yet) lands on this branch.