Hi Diego,

Are you sure that the Slurm software installed on all compute nodes was actually built on a system which had the hwloc packages installed? They should also be installed on the compute nodes. The prerequisite packages are listed here:
https://wiki.fysik.dtu.dk/niflheim/Slurm_installation#install-prerequisites

/Ole


On 05-11-2021 15:38, Diego Zuccato wrote:
They aren't using modules so it must be something system-wide :(
But not all jobs are impacted. And it seems it's a bit random (doesn't happen always).
I'm out of ideas, currently :(

Il 05/11/2021 13:10, Ole Holm Nielsen ha scritto:
On 11/5/21 12:47, Diego Zuccato wrote:
Some users are reporting this error:

slurmstepd-str957-mtx-01: error: hwloc_get_obj_below_by_type() failing, task/affinity plugin may be required to address bug fixed in HWLOC version 1.11.5
slurmstepd-str957-mtx-01: error: task[0] unable to set taskset '0x0'

I checked on that node and hwloc is newer:
diego.zuccato@str957-mtx-01:~$ hwloc-info --version
hwloc-info 2.4.1

How can Slurm detect such an old HWLOC version?

Maybe the user loads a software module which also loads an old hwloc module?   The user should do "module list" in the job to verify this.

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