build: add support for Clang with Thread Sanitizer.

.bazelrc

@@ -30,6 +30,16 @@ build:clang-asan-strict --config=clang-asan
 build:clang-asan-strict --copt -fsanitize=integer
 build:clang-asan-strict --linkopt -fsanitize=integer
 
+# Use Clang compiler with Thread Sanitizer.
+build:clang-tsan --config=clang
+build:clang-tsan --copt -DTHREAD_SANITIZER=1
+build:clang-tsan --copt -O1
+build:clang-tsan --copt -fno-omit-frame-pointer
+build:clang-tsan --copt -fno-optimize-sibling-calls
+build:clang-tsan --copt -fsanitize=thread
+build:clang-tsan --linkopt -fsanitize=thread
+build:clang-tsan --linkopt -fuse-ld=lld
+
 # Use GCC compiler.
 build:gcc --action_env=BAZEL_COMPILER=gcc
 build:gcc --action_env=CC=gcc

.github/workflows/test.yml

@@ -102,6 +102,12 @@ jobs:
           arch: x86_64
           action: test
           flags: --config=clang-asan-strict --define=crypto=system
+        - name: 'NullVM on Linux/x86_64 with TSan'
+          engine: 'null'
+          os: ubuntu-20.04
+          arch: x86_64
+          action: test
+          flags: --config=clang-tsan
         - name: 'NullVM on Windows/x86_64'
           engine: 'null'
           os: windows-2019
@@ -123,6 +129,14 @@ jobs:
           action: test
           flags: --config=clang-asan
           cache: true
+        - name: 'V8 on Linux/x86_64 with TSan'
+          engine: 'v8'
+          repo: 'v8'
+          os: ubuntu-20.04
+          arch: x86_64
+          action: test
+          flags: --config=clang-tsan
+          cache: true
         - name: 'V8 on Linux/aarch64'
           engine: 'v8'
           repo: 'v8'

test/runtime_test.cc

@@ -128,7 +128,14 @@ TEST_P(TestVM, CloneUntilOutOfMemory) {
     // Prevent clone from droping out of scope and freeing memory.
     clones.push_back(std::move(clone));
   }
-  EXPECT_GE(clones.size(), 1000);
+
+  size_t min_clones = 1000;
+#if defined(__has_feature)
+#if __has_feature(thread_sanitizer)
+  min_clones = 100;
+#endif
+#endif
+  EXPECT_GE(clones.size(), min_clones);
 }
 
 #endif