From: Daniel Harding <[email protected]>
To: Jens Axboe <[email protected]>, Pavel Begunkov <[email protected]>
Cc: [email protected], [email protected],
[email protected]
Subject: Re: [REGRESSION] lxc-stop hang on 5.17.x kernels
Date: Mon, 2 May 2022 16:36:25 +0300 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 5/2/22 16:26, Jens Axboe wrote:
> On 5/2/22 7:17 AM, Daniel Harding wrote:
>> I use lxc-4.0.12 on Gentoo, built with io-uring support
>> (--enable-liburing), targeting liburing-2.1. My kernel config is a
>> very lightly modified version of Fedora's generic kernel config. After
>> moving from the 5.16.x series to the 5.17.x kernel series, I started
>> noticed frequent hangs in lxc-stop. It doesn't happen 100% of the
>> time, but definitely more than 50% of the time. Bisecting narrowed
>> down the issue to commit aa43477b040251f451db0d844073ac00a8ab66ee:
>> io_uring: poll rework. Testing indicates the problem is still present
>> in 5.18-rc5. Unfortunately I do not have the expertise with the
>> codebases of either lxc or io-uring to try to debug the problem
>> further on my own, but I can easily apply patches to any of the
>> involved components (lxc, liburing, kernel) and rebuild for testing or
>> validation. I am also happy to provide any further information that
>> would be helpful with reproducing or debugging the problem.
> Do you have a recipe to reproduce the hang? That would make it
> significantly easier to figure out.
I can reproduce it with just the following:
sudo lxc-create --n lxc-test --template download --bdev dir --dir
/var/lib/lxc/lxc-test/rootfs -- -d ubuntu -r bionic -a amd64
sudo lxc-start -n lxc-test
sudo lxc-stop -n lxc-test
The lxc-stop command never exits and the container continues running.
If that isn't sufficient to reproduce, please let me know.
--
Regards,
Daniel Harding
next prev parent reply other threads:[~2022-05-02 13:36 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-02 13:17 [REGRESSION] lxc-stop hang on 5.17.x kernels Daniel Harding
2022-05-02 13:26 ` Jens Axboe
2022-05-02 13:36 ` Daniel Harding [this message]
2022-05-02 13:59 ` Jens Axboe
2022-05-02 17:00 ` Jens Axboe
2022-05-02 17:40 ` Pavel Begunkov
2022-05-02 18:49 ` Daniel Harding
2022-05-02 23:14 ` Pavel Begunkov
2022-05-03 7:37 ` Daniel Harding
2022-05-03 14:14 ` Pavel Begunkov
2022-05-04 6:54 ` Daniel Harding
2022-05-15 8:20 ` Thorsten Leemhuis
2022-05-15 18:34 ` Daniel Harding
2022-05-16 12:12 ` Pavel Begunkov
2022-05-16 13:25 ` Pavel Begunkov
2022-05-16 13:57 ` Daniel Harding
2022-05-16 15:13 ` Daniel Harding
2022-05-16 18:13 ` Pavel Begunkov
2022-05-17 8:19 ` Christian Brauner
2022-05-17 10:31 ` Pavel Begunkov
2022-05-16 18:17 ` Thorsten Leemhuis
2022-05-16 18:22 ` Jens Axboe
2022-05-16 18:34 ` Thorsten Leemhuis
2022-05-16 18:39 ` Jens Axboe
2022-05-16 19:07 ` Thorsten Leemhuis
2022-05-16 19:14 ` Jens Axboe
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