Suppress re2 related thread sanitizer warnings.
@@ -34,3 +34,9 @@ deadlock:proton::ImportedAttributesContext::getAttributeStableEnum
race:llvm::sys::MutexImpl
race:llvm::sys::SmartMutex<false>::lock
race:llvm::sys::SmartMutex<true>::lock
+
+# This is external code that we do not control. Complains that mutex
+# creation and locking is not strictly enough ordered.
+
+race:re2::Prog::GetDFA
+race:re2::DFA::DFA
