Update libcxx-build-and-test.yaml

Author: EricWF

.github/workflows/libcxx-build-and-test.yaml

@@ -41,8 +41,14 @@ jobs:
     container: ghcr.io/llvm/libcxx-linux-builder:2b57ebb50b6d418e70382e655feaa619b558e254
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - run: sudo sysctl vm.mmap_rnd_bits=28; sudo sysctl vm.mmap_rnd_bits;
       - name: generic-tsan
-        run: sudo sysctl vm.mmap_rnd_bits=28; sudo sysctl kernel.randomize_va_space=0; sudo sysctl vm.mmap_rnd_bits; libcxx/utils/ci/run-buildbot generic-tsan
+        run:  libcxx/utils/ci/run-buildbot generic-tsan
+        env:
+          CC: clang-21
+          CXX: clang++-21
+      - name: generic-msan
+        run:  libcxx/utils/ci/run-buildbot generic-msan
         env:
           CC: clang-21
           CXX: clang++-21