diff --git a/tests/appsec/contrib_appsec/test_fastapi.py b/tests/appsec/contrib_appsec/test_fastapi.py
index 027013eb8ca..3638d9a5c0d 100644
--- a/tests/appsec/contrib_appsec/test_fastapi.py
+++ b/tests/appsec/contrib_appsec/test_fastapi.py
@@ -15,7 +15,7 @@
 
 class Test_FastAPI(utils.Contrib_TestClass_For_Threats):
     @pytest.fixture
-    def interface(self, tracer, printer):
+    def interface(self, printer):
         from fastapi.testclient import TestClient
 
         # for fastapi, test tracer needs to be set before the app is created
diff --git a/tests/utils.py b/tests/utils.py
index 70193d61293..a63e00315f9 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -644,6 +644,10 @@ def pop(self):
         spans = DummyWriterMixin.pop(self)
         if self._trace_flush_enabled:
             flush_test_tracer_spans(self)
+        # Stop the writer threads in case the writer is no longer used.
+        # Otherwise we risk accumulating threads and file descriptors causing crashes
+        # In case the writer is used again it will be restarted by native side.
+        self._inner_writer.before_fork()
         return spans
 
     def recreate(self, appsec_enabled: Optional[bool] = None) -> "DummyWriter":