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Diffstat (limited to 'Lib/test/_test_multiprocessing.py')
| -rw-r--r-- | Lib/test/_test_multiprocessing.py | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py index 910cfa9..ac1b2a7 100644 --- a/Lib/test/_test_multiprocessing.py +++ b/Lib/test/_test_multiprocessing.py @@ -300,6 +300,9 @@ class _TestProcess(BaseTestCase): p.terminate() if hasattr(signal, 'alarm'): + # On the Gentoo buildbot waitpid() often seems to block forever. + # We use alarm() to interrupt it if it blocks for too long, and + # then try to print a backtrace for the child process using gdb. def handler(*args): raise RuntimeError('join took too long: %s' % p) old_handler = signal.signal(signal.SIGALRM, handler) @@ -307,6 +310,16 @@ class _TestProcess(BaseTestCase): signal.alarm(10) self.assertEqual(join(), None) signal.alarm(0) + except RuntimeError: + print('os.waitpid() =', os.waitpid(p.pid, os.WNOHANG)) + import subprocess + p = subprocess.Popen(['gdb', sys.executable, str(p.pid)], + stdin=subprocess.PIPE) + try: + p.communicate(b'bt 50', timeout=10) + except subprocess.TimeoutExpired: + p.kill() + raise finally: signal.signal(signal.SIGALRM, old_handler) else: |