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- mirror spack-latest.yaml, with -fsanitize=thread on the libzmq and libsodium nodes so tsan can observe the happens-before edges established inside libzmq's lock-free queues, plus the libstdcxx-tsan root spec - flags are applied per node instead of via the propagating '==' operator, which could reach the gcc node and trigger a compiler rebuild - unchanged roots (fairlogger, boost, ninja, cmake) keep their spec hashes, so they are shared with the regular buildcache entries; the instrumented nodes hash differently and coexist in the content-addressed cache - exclude libstdcxx-tsan from concretizer reuse so recipe changes always take effect; unchanged recipes still hit the buildcache because the spec hash is identical - add the tsan env to the buildcache matrix (rebuilding also on spack_repo changes) so the instrumented binaries are cached instead of rebuilt on every CI run