add suppression for llvm lock
@@ -9,3 +9,8 @@ deadlock:search::AttributeContext::getAttribute
deadlock:search::AttributeContext::getAttributeStableEnum
deadlock:proton::ImportedAttributesContext::getAttribute
deadlock:proton::ImportedAttributesContext::getAttributeStableEnum
+
+# This is external code that we do not control. Complains that mutex
+# creation and locking is not strictly enough ordered.
+
+race:llvm::sys::MutexImpl
