CI / build-and-test (push) Failing after 23s
The real Gitea Actions run on this project's own registered runner just failed exactly as CONTRIBUTING.md already anticipated it might: FATAL: ThreadSanitizer: unexpected memory mapping, the same signature already documented as a sandbox/container seccomp restriction blocking personality(ADDR_NO_RANDOMIZE), which TSan needs to start at all. Build, test suite, and ASan/UBSan all passed -- only the TSan step failed, on an environment issue, not a code issue. Fixed the CI step itself rather than just noting the failure: it now classifies each binary's TSan run as PASS, a known flake (that exact FATAL signature and nothing indicating an actual race was found), or a real failure (anything else -- a genuine data race, a crash, any other error). Only a real failure fails the build. Verified the classification logic locally against four cases (a synthetic real race report, a plain assertion failure, the known flake signature alone, and a clean pass) -- each classified correctly -- and against this sandbox's own six test binaries, all six of which hit the real flake (this sandbox has never been able to run TSan either) and correctly did not fail the build. This does NOT mean TSan verification is happening in CI -- it means CI no longer conflates "TSan couldn't start" with "the build is broken." Updated CONTRIBUTING.md and CLAUDE.md from "whether the runner can execute TSan is unverified" (a hedge) to the now-confirmed fact that it can't, and corrected an overclaim in README.md that the suite is "regularly run under ThreadSanitizer" -- as far as this project has been able to confirm, TSan has not actually completed a run in any environment it's been built in yet, local sandbox or CI. ASan/UBSan remain the real, run, load-bearing sanitizer coverage. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UqJpkdJ6Njnt1pw3CbghzB