[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

William Fisher added the comment: asyncio.MultiLoopChildWatcher has two problems that create a race condition. 1. The SIGCHLD signal handler does not guard against interruption/re-entry. 2. The SIGCHLD signal handler can interrupt add_child_handler's `self._do_waitpid(pid)`. Symptoms: Log

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: MultiLoopChildWatcher still has a race condition. I see different options: * Deprecate/Remove MultiLoopChildWatcher * Find a magic fix for MultiLoopChildWatcher. It sounds complicated since it's *designed* to not be related to any event loop. See my failed

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Ken Jin : -- pull_requests: -25430 ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Ken Jin : -- nosy: +kj nosy_count: 10.0 -> 11.0 pull_requests: +25430 pull_request: https://github.com/python/cpython/pull/26848 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Jack DeVries : -- pull_requests: -25270 ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Jack DeVries : -- nosy: -jack__d ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: > I think this is a good idea. MultiLoopChildWatcher could use setwakeupfd with > some no-op callback just to wakeup the loop. A no-op doesn't solve the issue. It doesn't wake up the event loop. There are only two options to wake up the event loop: * Raise

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Pablo Galindo Salgado added the comment: New changeset af5fb6706219d7949c1db5c9f2b7da53198123f3 by Miss Islington (bot) in branch '3.8': bpo-38323: Skip SubprocessMultiLoopWatcherTest as they can hang the test suite (GH-26542) (GH-26670)

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Jack DeVries : -- nosy: +jack__d nosy_count: 10.0 -> 11.0 pull_requests: +25270 pull_request: https://github.com/python/cpython/pull/26643 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by miss-islington : -- pull_requests: +25257 pull_request: https://github.com/python/cpython/pull/26670 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Pablo Galindo Salgado : -- pull_requests: +25247 pull_request: https://github.com/python/cpython/pull/26632 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Yury Selivanov added the comment: > MultiLoopChildWatcher must ensures that the event loop is awaken when it > receives a signal by using signal.setwakeup(). This is done by > _UnixSelectorEventLoop.add_signal_handler(). Maybe MultiLoopChildWatcher > could reuse this function, rather than

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Shreyan Avigyan : -- pull_requests: +25162 pull_request: https://github.com/python/cpython/pull/26574 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Shreyan Avigyan : -- nosy: +shreyanavigyan ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Pablo Galindo Salgado added the comment: New changeset 0d441d2e70e365b5dc517d8ff24a20b97bc4536a by Miss Islington (bot) in branch '3.10': bpo-38323: Skip SubprocessMultiLoopWatcherTest as they can hang the test suite (GH-26542) (GH-26544)

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

miss-islington added the comment: New changeset b3c50b29e14d8f089aee3e0980298bfc74cb3ba7 by Miss Islington (bot) in branch '3.9': bpo-38323: Skip SubprocessMultiLoopWatcherTest as they can hang the test suite (GH-26542)

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by miss-islington : -- pull_requests: +25134 pull_request: https://github.com/python/cpython/pull/26544 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by miss-islington : -- pull_requests: +25133 pull_request: https://github.com/python/cpython/pull/26543 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Pablo Galindo Salgado added the comment: New changeset f171877ebe276749f31386baed5841ce37cbee2e by Pablo Galindo in branch 'main': bpo-38323: Skip SubprocessMultiLoopWatcherTest as they can hang the test suite (GH-26542)

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Pablo Galindo Salgado added the comment: I'm landing https://github.com/python/cpython/pull/26542 as a temporary solution meanwhile we decide what to do with PR 26536. -- ___ Python tracker

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Pablo Galindo Salgado : -- pull_requests: +25132 pull_request: https://github.com/python/cpython/pull/26542 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Pablo Galindo Salgado : -- nosy: +pablogsal nosy_count: 8.0 -> 9.0 pull_requests: +25131 pull_request: https://github.com/python/cpython/pull/26541 ___ Python tracker

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by STINNER Victor : -- pull_requests: +25127 pull_request: https://github.com/python/cpython/pull/26536 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: > MultiLoopChildWatcher must ensures that the event loop is awaken when it > receives a signal by using signal.setwakeup(). This is done by > _UnixSelectorEventLoop.add_signal_handler(). Maybe MultiLoopChildWatcher > could reuse this function, This is the

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: When I reproduce test_cancel_make_subprocess_transport_exec() hang, the problem is that the C signal handler is called with SIGCHLD when the child process completes, but the Python signal handler is not called. Python is "blocked" in a selector (maybe

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: > This issue is not solved. Yes, nothing was changed. After diagnosing this issue and trying some things out in a draft PR, my conclusion is that an asyncio maintainer really needs to weigh in on what to do (especially Andrew who authored the class). The

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: This issue is not solved. I can still reproduce the hang using: ./python -m test test_asyncio -m SubprocessMultiLoopWatcherTests -v -F -j20 --timeout=30.0 Example with test_cancel_make_subprocess_transport_exec: $ ./python -m test test_asyncio -m

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

miss-islington added the comment: New changeset dd262ef46d2e2fff4c413cfa5faa9e72cd36220e by Miss Islington (bot) in branch '3.8': bpo-38323: Add guard clauses in MultiLoopChildWatcher. (GH-22756) https://github.com/python/cpython/commit/dd262ef46d2e2fff4c413cfa5faa9e72cd36220e --

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

miss-islington added the comment: New changeset bf0eed3e60acc7e4969a4fae940bc615fa924c30 by Miss Islington (bot) in branch '3.9': bpo-38323: Add guard clauses in MultiLoopChildWatcher. (GH-22756) https://github.com/python/cpython/commit/bf0eed3e60acc7e4969a4fae940bc615fa924c30 --

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by miss-islington : -- nosy: +miss-islington nosy_count: 7.0 -> 8.0 pull_requests: +22666 pull_request: https://github.com/python/cpython/pull/23806 ___ Python tracker

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Andrew Svetlov added the comment: New changeset 66d3b589c44fcbcf9afe1e442d9beac3bd8bcd34 by Chris Jerdonek in branch 'master': bpo-38323: Add guard clauses in MultiLoopChildWatcher. (#22756) https://github.com/python/cpython/commit/66d3b589c44fcbcf9afe1e442d9beac3bd8bcd34 --

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by miss-islington : -- pull_requests: +22667 pull_request: https://github.com/python/cpython/pull/23807 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Jakub Stasiak added the comment: FYI your PR 20142 together with my PR https://github.com/python/cpython/pull/23154 allow me to run the whole test_asyncio test suite on OpenIndiana 5.11: $ ./python -m unittest -v test.test_asyncio (...) Ran 2298 tests in 71.668s OK (skipped=52) without

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Jakub Stasiak : -- nosy: +jstasiak ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Chris Jerdonek : -- pull_requests: +21719 pull_request: https://github.com/python/cpython/pull/22756 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Chris Jerdonek : -- type: -> behavior ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: I posted a draft PR for this issue: https://github.com/python/cpython/pull/20142 -- ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Chris Jerdonek : -- pull_requests: +19447 pull_request: https://github.com/python/cpython/pull/20142 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: I think I have a possible explanation for this now. In my reproducer script and in the original test, the wakeup file descriptor isn't set. I think this explains why the loop isn't waking up to call SIGCHLD's handler when the signal comes in. The reason the

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: I was able to simplify the script a lot more and continue to reproduce the hang. It's attached as test-kill3.py (80 lines). It doesn't use subprocess_exec() or a watcher anymore -- just subprocess.Popen() followed by popen.kill(), and then awaiting on a

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: > 4. use call_later() to terminate the future after 5 seconds You should read that as "3.5" (I inserted it later). -- ___ Python tracker

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: I came up with the script by (1) running the test locally and seeing the same hang, (2) moving the test function to its own script separate from the unit tests and seeing the same hang, and (3) successively stripping away code while continuing to check for

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Nathaniel Smith added the comment: How do you know that your reproducer is showing the same bug, or anything related to signals? IIUC subprocess waiting by default doesn't involve a signal handler. On Sat, May 9, 2020, 14:40 Chris Jerdonek wrote: > > Chris Jerdonek added the comment: > > >

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: > this seems like an awful lot of energy to spend on some code that's not even used by default. True, but it seems likely to me that this signals :) a deeper, more general issue about CPython / signals (which is why I spent time on it). For example, my

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Kyle Stanley added the comment: > Would it make sense to deprecate it and stick with ThreadedChildWatcher? I had proposed deprecating it in another bpo issue, but it was brought up that MutliLoopWatcher had only been added recently in 3.8. So, it might be a bit too soon to deprecate it

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Nathaniel Smith added the comment: I don't have any particular insight into the bug, but I do have an observation: this seems like an awful lot of energy to spend on some code that's not even used by default. Would it make sense to deprecate it and stick with ThreadedChildWatcher? On Sat, May

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: I'm adding Nathaniel in case he can recognize this as one of the signal handler cases he's already come across. -- nosy: +njs ___ Python tracker

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: I'm attaching a slightly simpler version of the script. -- Added file: https://bugs.python.org/file49145/test-kill2.py ___ Python tracker

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: I'm attaching a stand-alone script that can reproduce the issue. It doesn't use unittest or even MultiLoopChildWatcher. It starts an event loop and then repeatedly calls loop.subprocess_exec() with 0.2 seconds in between until the "hang" happens (which

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Chris Jerdonek added the comment: I looked into this a little after reproducing it locally. What I found is that MultiLoopChildWatcher._sig_chld() *is* called. It's just that it's only called immediately after timeout=5 has elapsed. (The timeout=5 was added by Andrew here:

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Kyle Stanley : -- pull_requests: +19324 pull_request: https://github.com/python/cpython/pull/20013 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Kyle Stanley added the comment: > What other MultiLoopWatcher tests are currently having random hangs? Oh, never mind. I see `test_stdin_stdout` is also hanging in https://bugs.python.org/issue38182. I would like to take a closer look at that one before skipping it as well. --

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Kyle Stanley added the comment: > There are more MultiLoopWatcher tests which hang randomly, it's not only > test_close_kill_running(). What other MultiLoopWatcher tests are currently having random hangs? From searching "MultiLoopWatcher" on bpo, I'm only finding this issue. For now, I'll

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: > we may want to consider skipping `test_close_kill_running` for > `MultiLoopWatcher` until we can find one There are more MultiLoopWatcher tests which hang randomly, it's not only test_close_kill_running(). I'm fine with skipping tests until someone can

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Kyle Stanley added the comment: I have also explored a few different solutions and was unable to find a fix for this issue. If it's still causing intermittent hangs after Andrew's patch, we may want to consider skipping `test_close_kill_running` for `MultiLoopWatcher` until we can find one.

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: Issue open since 2019-09-30 and tests still hang randomly. What's the progress on this issue? -- ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Andrew Svetlov added the comment: Victor, sorry. I spent about 4 days in total trying to figure out what is the reason for hanging. I see that the signal handler is installed; but, in a rare situation, it is not called when the process is killed. If I reduce an amount of code executed in a

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Andrew Svetlov : -- keywords: +patch pull_requests: +17831 stage: -> patch review pull_request: https://github.com/python/cpython/pull/18457 ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: This issue is still failing frequently on buildbots. What can be done to stop getting test failures on buildbots? -- ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: I marked bpo-38182 as a duplicate of this issue: "test_asyncio: SubprocessMultiLoopWatcherTests.test_stdin_stdout() failed on AMD64 FreeBSD 10-STABLE Non-Debug 3.x". -- ___ Python tracker

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: > FYI, I'm able to reproduce the hang by running "python -m test -F > test_asyncio -m test_close_kill_running". Working on the fix. Any update on this issue? It's still failing randomly on buildbots. Example:

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Andrew Svetlov added the comment: FYI, I'm able to reproduce the hang by running "python -m test -F test_asyncio -m test_close_kill_running". Working on the fix. -- ___ Python tracker

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Andrew Svetlov added the comment: I'd like to spend time by reproducing the issue locally. Please give me a few days. -- ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: The test still hangs randomly. Can it be disabled or fixed? s390x Debian 3.x: https://buildbot.python.org/all/#builders/105/builds/167 test_close_dont_kill_finished (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok Timeout

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: I did my tests on Fedora 30 on my laptop which has 4 cores (8 logical CPUs). -- ___ Python tracker ___

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Kyle Stanley added the comment: > I'm able to reproduce the issue locally using the command: ./python -m test test_asyncio --match=test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests.test_close_kill_running -v -F -j20 --timeout=30.0 I was unable to reproduce this locally on

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by Kyle Stanley : -- nosy: +aeros ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

STINNER Victor added the comment: It seems like MultiLoopChildWatcher doesn't respect the PEP 475: siginterrupt(False) must not be used. But the following change isn't enough to fix this issue (test_close_kill_running hang). diff --git a/Lib/asyncio/unix_events.py

[issue38323] asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x)

Change by STINNER Victor : -- title: test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x -> asyncio: MultiLoopWatcher has a race condition (test_asyncio: test_close_kill_running() hangs on AMD64 RHEL7 Refleaks 3.x) ___ Python