adjust signal failed wait time (#28640)

python/paddle/fluid/tests/unittests/test_imperative_signal_handler.py

@@ -49,7 +49,7 @@ class TestDygraphDataLoaderSingalHandler(unittest.TestCase):
             test_process.start()
 
             set_child_signal_handler(id(self), test_process.pid)
-            time.sleep(5)
+            time.sleep(10)
         except SystemError as ex:
             self.assertIn("Fatal", cpt.get_exception_message(ex))
             exception = ex
@@ -67,7 +67,7 @@ class TestDygraphDataLoaderSingalHandler(unittest.TestCase):
             test_process.start()
 
             set_child_signal_handler(id(self), test_process.pid)
-            time.sleep(3)
+            time.sleep(10)
         except SystemError as ex:
             self.assertIn("Segmentation fault", cpt.get_exception_message(ex))
             exception = ex
@@ -85,7 +85,7 @@ class TestDygraphDataLoaderSingalHandler(unittest.TestCase):
             test_process.start()
 
             set_child_signal_handler(id(self), test_process.pid)
-            time.sleep(3)
+            time.sleep(10)
         except SystemError as ex:
             self.assertIn("Bus error", cpt.get_exception_message(ex))
             exception = ex