test

Author: maurycy

Lib/test/test_external_inspection.py

@@ -13,6 +13,7 @@
 from unittest.mock import ANY
 from test.support import (
     os_helper,
+    threading_helper,
     SHORT_TIMEOUT,
     busy_retry,
     requires_gil_enabled,
@@ -3544,6 +3545,36 @@ def gen():
             skip_non_matching_threads=True,
         )
 
+    @unittest.skipIf(
+        sys.platform == "linux" and not PROCESS_VM_READV_SUPPORTED,
+        "Test only runs on Linux with process_vm_readv support",
+    )
+    @requires_gil_enabled()
+    @threading_helper.requires_working_threading()
+    def test_filtered_active_thread_is_not_replaced(self):
+        samples = []
+
+        def sample():
+            for kwargs in ({"all_threads": True},
+                           {"only_active_thread": True}):
+                unwinder = RemoteUnwinder(
+                    os.getpid(), mode=PROFILING_MODE_EXCEPTION, **kwargs,
+                )
+                samples.append(
+                    self._get_thread_statuses(unwinder.get_stack_trace())
+                )
+
+        thread = threading.Thread(target=sample)
+        try:
+            raise ValueError
+        except ValueError:
+            thread.start()
+            threading_helper.join_thread(thread)
+
+        all_threads, active_thread = samples
+        self.assertEqual(list(all_threads), [threading.get_native_id()])
+        self.assertEqual(active_thread, {})
+
 
 @requires_remote_subprocess_debugging()
 class TestFrameCaching(RemoteInspectionTestBase):