Messages in this thread | | | Date | Mon, 2 May 2022 16:36:25 +0300 | Subject | Re: [REGRESSION] lxc-stop hang on 5.17.x kernels | From | Daniel Harding <> |
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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
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