Trust mimalloc to be thread safe (#4649)

kotlin-native/build-tools/src/main/kotlin/org/jetbrains/kotlin/testing/native/NativeTest.kt

@@ -272,6 +272,14 @@ private fun createTestTask(
         val xmlReport = workingDir.resolve("report.xml")
         executable(linkTask.outputFile)
         args("--gtest_output=xml:${xmlReport.absoluteFile}")
+        when (sanitizer) {
+            SanitizerKind.THREAD -> {
+                val file = project.file("tsan_suppressions.txt")
+                inputs.file(file)
+                environment("TSAN_OPTIONS", "suppressions=${file.absolutePath}")
+            }
+            else -> {} // no action required
+        }
 
         doFirst {
             workingDir.mkdirs()

kotlin-native/runtime/tsan_suppressions.txt

@@ -0,0 +1,3 @@
+# Trust mimalloc to be thread safe.
+race:^mi_
+race:^_mi_