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ci: fix flaky SDE runs and split instruction-set coverage into a matrix - #126
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Intel SDE does not preserve emulated vector registers across signal handlers, and the runtime signals threads to suspend them for GC, which corrupted test state under `sde64 -spr`. Make GC wait for threads to poll instead, and keep glibc and OpenSSL off emulated AVX-512. - Run each DOTNET_Enable* configuration as its own matrix job through .github/test.sh, under SDE only when it adds instruction sets the runner lacks, and fail if the probe or SDE fails. - Cover the ARM64 switches on ubuntu-26.04-arm. - Keep Windows and macOS to default dispatch, plus the portable path on Windows. - Check out text files with LF so test.sh runs under Git Bash on Windows.
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Intel SDE does not preserve emulated vector registers across signal handlers (Intel Community thread), and the .NET runtime signals threads to suspend them for GC, which corrupted test state under
sde64 -spr.Changes
DOTNET_INTERNAL_ThreadSuspendInjection=0so GC waits for threads to poll, and keep glibc and OpenSSL off emulated AVX-512.DOTNET_Enable*configuration as its own matrix job through.github/test.sh. Linux x64 jobs run under SDE only when it adds instruction sets the runner lacks, and fail if the probe or SDE fails.ubuntu-26.04-arm..gitattributeswitheol=lfsotest.shruns under Git Bash on Windows.