Many thanks One question? Do we have to apply this patch (and recompile slurm i guess) only on the compute-node with problems? Also, I noticed the patch now appears as "obsolete", is that ok?
On Wed, Jan 24, 2024 at 9:52 AM Stefan Fleischmann <s...@kth.se> wrote: > Turns out I was wrong, this is not a problem in the kernel at all. It's > a known bug that is triggered by long bpf logs, see here > https://bugs.schedmd.com/show_bug.cgi?id=17210 > > There is a patch included there. > > Cheers, > Stefan > > On Tue, 23 Jan 2024 15:28:59 +0100 Stefan Fleischmann <s...@kth.se> > wrote: > > I don't think there is much for SchedMD to do. As I said since it is > > working fine with newer kernels there doesn't seem to be any breaking > > change in cgroup2 in general, but only a regression introduced in one > > of the latest updates in 5.15. > > > > If Slurm was doing something wrong with cgroup2, and it accidentally > > worked until this recent change, then other kernel versions should > > show the same behavior. But as far as I can tell it still works just > > fine with newer kernels. > > > > Cheers, > > Stefan > > > > On Tue, 23 Jan 2024 15:20:56 +0100 > > Tim Schneider <tim.schneid...@tu-darmstadt.de> wrote: > > > > > Hi, > > > > > > I have filed a bug report with SchedMD > > > (https://bugs.schedmd.com/show_bug.cgi?id=18623), but the support > > > told me they cannot invest time in this issue since I don't have a > > > support contract. Maybe they will look into it once it affects more > > > people or someone important enough. > > > > > > So far, I have resorted to using 5.15.0-89-generic, but I am also a > > > bit concerned about the security aspect of this choice. > > > > > > Best, > > > > > > Tim > > > > > > On 23.01.24 14:59, Stefan Fleischmann wrote: > > > > Hi! > > > > > > > > I'm seeing the same in our environment. My conclusion is that it > > > > is a regression in the Ubuntu 5.15 kernel, introduced with > > > > 5.15.0-90-generic. Last working kernel version is > > > > 5.15.0-89-generic. I have filed a bug report here: > > > > https://bugs.launchpad.net/bugs/2050098 > > > > > > > > Please add yourself to the affected users in the bug report so it > > > > hopefully gets more attention. > > > > > > > > I've tested with newer kernels (6.5, 6.6 and 6.7) and the problem > > > > does not exist there. 6.5 is the latest hwe kernel for 22.04 and > > > > would be an option for now. Reverting back to 5.15.0-89 would work > > > > as well, but I haven't looked into the security aspects of that. > > > > > > > > Cheers, > > > > Stefan > > > > > > > > On Mon, 22 Jan 2024 13:31:15 -0300 > > > > cristobal.navarro.g at gmail.com wrote: > > > > > > > >> Hi Tim and community, > > > >> We are currently having the same issue (cgroups not working it > > > >> seems, showing all GPUs on jobs) on a GPU-compute node (DGX A100) > > > >> a couple of days ago after a full update (apt upgrade). Now > > > >> whenever we launch a job for that partition, we get the error > > > >> message mentioned by Tim. As a note, we have another custom > > > >> GPU-compute node with L40s, on a different partition, and that > > > >> one works fine. Before this error, we always had small > > > >> differences in kernel version between nodes, so I am not sure if > > > >> this can be the problem. Nevertheless, here is the info of our > > > >> nodes as well. > > > >> > > > >> *[Problem node]* The DGX A100 node has this kernel > > > >> cnavarro at nodeGPU01:~$ uname -a > > > >> Linux nodeGPU01 5.15.0-1042-nvidia #42-Ubuntu SMP Wed Nov 15 > > > >> 20:28:30 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux > > > >> > > > >> *[Functioning node]* The Custom GPU node (L40s) has this kernel > > > >> cnavarro at nodeGPU02:~$ uname -a > > > >> Linux nodeGPU02 5.15.0-91-generic #101-Ubuntu SMP Tue Nov 14 > > > >> 13:30:08 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux > > > >> > > > >> *And the login node *(slurmctld) > > > >> ? ~ uname -a > > > >> Linux patagon-master 5.15.0-91-generic #101-Ubuntu SMP Tue Nov 14 > > > >> 13:30:08 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux > > > >> > > > >> Any ideas what we should check? > > > >> > > > >> On Thu, Jan 4, 2024 at 3:03?PM Tim Schneider <tim.schneider1 at > > > >> tu-darmstadt.de> wrote: > > > >> > > > >>> Hi, > > > >>> > > > >>> I am using SLURM 22.05.9 on a small compute cluster. Since I > > > >>> reinstalled two of our nodes, I get the following error when > > > >>> launching a job: > > > >>> > > > >>> slurmstepd: error: load_ebpf_prog: BPF load error (No space left > > > >>> on device). Please check your system limits (MEMLOCK). > > > >>> > > > >>> Also the cgroups do not seem to work properly anymore, as I am > > > >>> able to see all GPUs even if I do not request them, which is not > > > >>> the case on the other nodes. > > > >>> > > > >>> One difference I found between the updated nodes and the > > > >>> original nodes (both are Ubuntu 22.04) is the kernel version, > > > >>> which is "5.15.0-89-generic #99-Ubuntu SMP" on the functioning > > > >>> nodes and "5.15.0-91-generic #101-Ubuntu SMP" on the updated > > > >>> nodes. I could not figure out how to install the exact first > > > >>> kernel version on the updated nodes, but I noticed that when I > > > >>> reinstall 5.15.0 with this tool: > > > >>> https://github.com/pimlie/ubuntu-mainline-kernel.sh, the error > > > >>> message disappears. However, once I do that, the network driver > > > >>> does not function properly anymore, so this does not seem to be > > > >>> a good solution. > > > >>> > > > >>> Has anyone seen this issue before or is there maybe something > > > >>> else I should take a look at? I am also happy to just find a > > > >>> workaround such that I can take these nodes back online. > > > >>> > > > >>> I appreciate any help! > > > >>> > > > >>> Thanks a lot in advance and best wishes, > > > >>> > > > >>> Tim > > > >>> > > > >>> > > > >>> > > > -- Cristóbal A. Navarro
