diff --git a/dvc/rwlock.py b/dvc/rwlock.py
index 278b72ebf0..3012a75c20 100644
--- a/dvc/rwlock.py
+++ b/dvc/rwlock.py
@@ -51,9 +51,6 @@ def _edit_rwlock(lock_dir):
     yield lock
     with open(path, "w+") as fobj:
         json.dump(lock, fobj)
-        # NOTE: flush and fsync to ensure that rwlock contents are saved
-        fobj.flush()
-        os.fsync(fobj.fileno())
 
 
 def _infos_to_str(infos):
diff --git a/tests/func/test_repro_multistage.py b/tests/func/test_repro_multistage.py
index 0507aacbc8..4a9eabca42 100644
--- a/tests/func/test_repro_multistage.py
+++ b/tests/func/test_repro_multistage.py
@@ -449,7 +449,7 @@ def test_repro_when_new_outs_added_does_not_exist(tmp_dir, dvc):
         {
             "stages": {
                 "run-copy": {
-                    "cmd": "python copy {} {}".format("foo", "foobar"),
+                    "cmd": "python copy.py {} {}".format("foo", "foobar"),
                     "deps": ["foo"],
                     "outs": ["foobar", "bar"],
                 }