New submission from STINNER Victor: I'm unable to reproduce the hang. It's probably a race condition since sometimes the test pass. It may depend on the system load, the number of CPU cores, and other factors.
I tried to use faulthandler.dump_traceback_later() in the changeset ebccac60b9e7, but it didn't print the traceback of the blocked test. So I don't know which eintr test is blocked. In the changeset ed0e6a9c11af, I rewrote test_eintr.py to use subprocess instead of os.fork(). I was supposed to reduce the risk of race condition, but the hang still occurs. On FreeBSD, I know that any thread can receive a signal, and most Python tests only expect that the signal is received from a specific thread. But test_eintr.py runs Lib/test/eintrdata/eintr_tester.py in a subprocess to avoid threads, and Lib/test/eintrdata/eintr_tester.py itself uses subprocess to spawn child processes, so it should also avoid threads. So I don't think that the issue is related to threads. At least, it would help to know which test hangs. Example: http://buildbot.python.org/all/builders/AMD64%20FreeBSD%209.x%203.x/builds/3337/steps/test/logs/stdio [398/398] test_eintr Timeout (1:00:00)! Thread 0x0000000801807400 (most recent call first): File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/selectors.py", line 375 in select File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/subprocess.py", line 1698 in _communicate File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/subprocess.py", line 1068 in communicate File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/support/script_helper.py", line 86 in run_python_until_end File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/support/script_helper.py", line 96 in _assert_python File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/support/script_helper.py", line 135 in assert_python_ok File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/test_eintr.py", line 17 in test_all File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/unittest/case.py", line 600 in run File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/unittest/case.py", line 648 in __call__ File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/unittest/suite.py", line 122 in run File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/unittest/suite.py", line 84 in __call__ File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/unittest/suite.py", line 122 in run File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/unittest/suite.py", line 84 in __call__ File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/unittest/suite.py", line 122 in run File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/unittest/suite.py", line 84 in __call__ File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/unittest/runner.py", line 176 in run File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/support/__init__.py", line 1775 in _run_suite File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/support/__init__.py", line 1809 in run_unittest File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/regrtest.py", line 1280 in test_runner File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/regrtest.py", line 1281 in runtest_inner File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/regrtest.py", line 968 in runtest File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/regrtest.py", line 532 in main File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/regrtest.py", line 1565 in main_in_temp_cwd File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/regrtest.py", line 1590 in <module> File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/runpy.py", line 85 in _run_code File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/runpy.py", line 170 in _run_module_as_main Traceback (most recent call last): File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/runpy.py", line 170, in _run_module_as_main "__main__", mod_spec) File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/runpy.py", line 85, in _run_code exec(code, run_globals) File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/__main__.py", line 3, in <module> regrtest.main_in_temp_cwd() File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/regrtest.py", line 1565, in main_in_temp_cwd main() File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/regrtest.py", line 738, in main raise Exception("Child error on {}: {}".format(test, result[1])) Exception: Child error on test_eintr: Exit code 1 *** [buildbottest] Error code 1 ---------- messages: 250753 nosy: haypo priority: normal severity: normal status: open title: test_eintr randomly fails on FreeBSD versions: Python 3.5, Python 3.6 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue25122> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
