Index: lib/StaticAnalyzer/Checkers/UninitializedObject/UninitializedObject.h
===================================================================
--- lib/StaticAnalyzer/Checkers/UninitializedObject/UninitializedObject.h
+++ lib/StaticAnalyzer/Checkers/UninitializedObject/UninitializedObject.h
@@ -324,7 +324,7 @@
 inline bool isPrimitiveType(const QualType &T) {
   return T->isBuiltinType() || T->isEnumeralType() ||
          T->isMemberPointerType() || T->isBlockPointerType() ||
-         T->isFunctionType();
+         T->isFunctionType() || T->isAtomicType();
 }
 
 inline bool isDereferencableType(const QualType &T) {
Index: test/Analysis/cxx-uninitialized-object.cpp
===================================================================
--- test/Analysis/cxx-uninitialized-object.cpp
+++ test/Analysis/cxx-uninitialized-object.cpp
@@ -1130,3 +1130,18 @@
   // TODO: we'd expect the warning: {{2 uninitializeds field}}
   CXX11MemberInitTest2(); // no-warning
 }
+
+//===----------------------------------------------------------------------===//
+// _Atomic tests.
+//===----------------------------------------------------------------------===//
+
+struct MyAtomicInt {
+  _Atomic(int) x; // expected-note{{uninitialized field 'this->x'}}
+  int dontGetFilteredByNonPedanticMode = 0;
+
+  MyAtomicInt() {} // expected-warning{{1 uninitialized field}}
+};
+
+void entry() {
+  MyAtomicInt b;
+}