Tiny add stuck simulation (#15613)

test/srt/run_suite.py

@@ -209,6 +209,7 @@ suites = {
         TestFile("test_profile_v2.py"),
         TestFile("models/test_ministral3_models.py"),
         TestFile("test_mistral_large3_basic.py"),
+        TestFile("test_soft_watchdog.py"),
     ],
 }
 

test/srt/test_soft_watchdog.py

@@ -0,0 +1,74 @@
+import io
+import unittest
+
+import requests
+
+from sglang.srt.environ import envs
+from sglang.srt.utils import kill_process_tree
+from sglang.test.test_utils import (
+    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+    DEFAULT_URL_FOR_TEST,
+    CustomTestCase,
+    popen_launch_server,
+)
+
+
+class BaseTestSoftWatchdog:
+    env_override = None
+    expected_message = None
+
+    @classmethod
+    def setUpClass(cls):
+        cls.stdout = io.StringIO()
+        cls.stderr = io.StringIO()
+
+        with cls.env_override():
+            cls.process = popen_launch_server(
+                "Qwen/Qwen3-0.6B",
+                DEFAULT_URL_FOR_TEST,
+                timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+                other_args=[
+                    "--soft-watchdog-timeout",
+                    "20",
+                    "--skip-server-warmup",
+                ],
+                return_stdout_stderr=(cls.stdout, cls.stderr),
+            )
+
+    @classmethod
+    def tearDownClass(cls):
+        kill_process_tree(cls.process.pid)
+        cls.stdout.close()
+        cls.stderr.close()
+
+    def test_watchdog_triggers(self):
+        print("Start call /generate API", flush=True)
+        try:
+            requests.post(
+                DEFAULT_URL_FOR_TEST + "/generate",
+                json={
+                    "text": "Hello, please repeat this sentence for 1000 times.",
+                    "sampling_params": {"max_new_tokens": 100, "temperature": 0},
+                },
+                timeout=30,
+            )
+        except requests.exceptions.ReadTimeout as e:
+            print(f"requests.post timeout (but expected): {e}")
+        print("End call /generate API", flush=True)
+
+        combined_output = self.stdout.getvalue() + self.stderr.getvalue()
+        self.assertIn(self.expected_message, combined_output)
+
+
+class TestSoftWatchdogDetokenizer(BaseTestSoftWatchdog, CustomTestCase):
+    env_override = lambda: envs.SGLANG_TEST_STUCK_DETOKENIZER.override(30)
+    expected_message = "DetokenizerManager watchdog timeout"
+
+
+class TestSoftWatchdogTokenizer(BaseTestSoftWatchdog, CustomTestCase):
+    env_override = lambda: envs.SGLANG_TEST_STUCK_TOKENIZER.override(30)
+    expected_message = "TokenizerManager watchdog timeout"
+
+
+if __name__ == "__main__":
+    unittest.main()