test: kill process group to avoid dangling processes

test/functional/test_runner.py

@@ -19,6 +19,7 @@ import datetime
 import os
 import time
 import shutil
+import signal
 import subprocess
 import sys
 import tempfile
@@ -548,9 +549,11 @@ def run_tests(*, test_list, src_dir, build_dir, tmpdir, jobs=1, enable_coverage=
 
     all_passed = all(map(lambda test_result: test_result.was_successful, test_results)) and coverage_passed
 
-    # This will be a no-op unless failfast is True in which case there may be dangling
-    # processes which need to be killed.
-    job_queue.kill_and_join()
+    # Clean up dangling processes if any. This may only happen with --failfast option.
+    # Killing the process group will also terminate the current process but that is
+    # not an issue
+    if len(job_queue.jobs):
+        os.killpg(os.getpgid(0), signal.SIGKILL)
 
     sys.exit(not all_passed)
 
@@ -647,16 +650,6 @@ class TestHandler:
                 print('.', end='', flush=True)
             dot_count += 1
 
-    def kill_and_join(self):
-        """Send SIGKILL to all jobs and block until all have ended."""
-        procs = [i[2] for i in self.jobs]
-
-        for proc in procs:
-            proc.kill()
-
-        for proc in procs:
-            proc.wait()
-
 
 class TestResult():
     def __init__(self, name, status, time):