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. -- Jens Axboe
