HI Pavel, hi Jens, On Thu, Jan 23, 2025 at 11:20:40PM +0000, Pavel Begunkov wrote: > On 1/23/25 20:49, Salvatore Bonaccorso wrote: > > Hi Xan, > > > > On Thu, Jan 23, 2025 at 02:31:34PM -0600, Xan Charbonnet wrote: > > > I rented a Linode and have been trying to load it down with sysbench > > > activity while doing a mariabackup and a mysqldump, also while spinning up > > > the CPU with zstd benchmarks. So far I've had no luck triggering the fault. > > > > > > I've also been doing some kernel compilation. I followed this guide: > > > https://www.dwarmstrong.org/kernel/ > > > (except that I used make -j24 to build in parallel and used make > > > localmodconfig to compile only the modules I need) > > > > > > I've built the following kernels: > > > 6.1.123 (equivalent to linux-image-6.1.0-29-amd64) > > > 6.1.122 > > > 6.1.121 > > > 6.1.120 > > > > > > So far they have all exhibited the behavior. Next up is 6.1.119 which is > > > equivalent to linux-image-6.1.0-28-amd64. My expectation is that the fault > > > will not appear for this kernel. > > > > > > It looks like the issue is here somewhere: > > > https://www.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.120 > > > > > > I have to work on some other things, and it'll take a while to prove the > > > negative (that is, to know that the failure isn't happening). I'll post > > > back with the 6.1.119 results when I have them. > > > > Additionally please try with 6.1.120 and revert this commit > > > > 3ab9326f93ec ("io_uring: wake up optimisations") > > > > (which landed in 6.1.120). > > > > If that solves the problem maybe we miss some prequisites in the 6.1.y > > series here? > > I'm not sure why the commit was backported (need to look it up), > but from a quick look it does seem to miss a barrier present in > the original patch. Ack, this was here for reference: https://lore.kernel.org/stable/57b048be-31d4-4380-8296-56afc886299a@xxxxxxxxx/ Xan Charbonnet was able to confirm in https://bugs.debian.org/1093243#99 that indeed reverting the commit fixes the mariadb related hangs. Regards, Salvatore
