fix(ci): force tarpaulin LLVM engine to end the recurring coverage segfault#163
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The `rust-ci / Coverage (tarpaulin + codecov)` job has failed on every recent PR (#161/#162) with "Failed to run tests: A segfault occurred while executing tests" — cargo-tarpaulin's default ptrace engine segfaulting while instrumenting the property-test binary on the CI runners. It is a tarpaulin instrumentation flake, not a real failure: the suite passes under `cargo test`, and the ptrace engine does not even reproduce the segfault locally. Add tarpaulin.toml selecting the LLVM (source-based) engine, which avoids ptrace entirely. The standards rust-ci reusable runs `cargo tarpaulin --out Xml`, which reads this [default] profile — so no reusable change is needed. Verified locally: with this config, `cargo tarpaulin --out Xml` activates LLVM_PROFILE_FILE coverage (26 profiled test binaries), exits 0, and writes a valid cobertura.xml. (The engine value must be capitalized "Llvm" — serde is case-sensitive; lowercase silently falls back to ptrace.) Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0172RBMz3qYjb1ttzD2i7RNh
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hyperpolymath
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July 1, 2026 13:08
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Summary
Fixes the recurring
rust-ci / Coverage (tarpaulin + codecov)red (failed on #161,#162, …) with a locally-verified repo-side change.
Root cause: the standards rust-ci reusable runs
cargo tarpaulin --out Xmlwith thedefault ptrace engine, which segfaults on the CI runners while instrumenting the
property-test binary (
"Failed to run tests: A segfault occurred while executing tests").It's a tarpaulin instrumentation flake — the suite passes under
cargo test, and theptrace engine doesn't even reproduce the segfault locally.
Fix:
tarpaulin.tomlselecting the LLVM (source-based) engine, which avoidsptrace entirely. The reusable's
cargo tarpaulin --out Xmlreads this[default]profile, so no standards-reusable change is needed.
Verified locally (I installed tarpaulin and reproduced the setup):
[default] engine = "Llvm"+cargo tarpaulin --out Xml→ activatesLLVM_PROFILE_FILEcoverage across 26 test binaries, exits 0, writes a validcobertura.xml."Llvm"— serde is case-sensitive; lowercasesilently falls back to ptrace.
This clears the last repo-side-fixable CI red. Remaining reds are genuinely external:
governance / Validate Hypatia Baselineis pre-existing #41 debt (needs the hypatiaCLI, out of session scope, or a baseline-regen decision), which the owner has merged past.
FLAGS (unchanged)
gossamer+conative-gatingstill 403-blocked → build: migrate Kotlin/Gradle Android app to gossamer (clears banned-language CI) #83 / Adopt conative-gating as policy/egress GO/NO-GO veto (refs proof-obligation #84-3.1) #103 staged until added tothe environment's repo scope.
🤖 Generated with Claude Code
https://claude.ai/code/session_0172RBMz3qYjb1ttzD2i7RNh
Generated by Claude Code