Leave a note for posterity

Author: ericriff

.github/workflows/cmake_ubuntu_sanitizers.yml

@@ -64,4 +64,6 @@ jobs:
         ASAN_OPTIONS: "color=always"
         UBSAN_OPTIONS: "halt_on_error=1:print_stacktrace=1:color=always"
         TSAN_OPTIONS: "color=always"
+      # There is a known issue with TSAN on recent kernels versions. Without the vm.mmap_rnd_bits=28
+      # workaround all binaries with TSan enabled crash with "FATAL: ThreadSanitizer: unexpected memory mapping"
       run: sudo sysctl vm.mmap_rnd_bits=28 && ctest --test-dir build/${{env.BUILD_TYPE}} --output-on-failure