Re: [PATCH sched_ext/for-6.13-fixes] sched_ext: Fix invalid irq restore in scx_ops_bypass()

Ihor Solodrai
2024-12-17T23:44:40Z

Hi Tejun,

I re-enabled selftests/sched_ext on BPF CI today. The kernel on CI
includes this patch. Sometimes there is a failure on attempt to attach
a dsp_local_on scheduler.

Examples of failed jobs:

* https://github.com/kernel-patches/bpf/actions/runs/12379720791/job/34555104994
* https://github.com/kernel-patches/bpf/actions/runs/12382862660/job/34564648924
* https://github.com/kernel-patches/bpf/actions/runs/12381361846/job/34560047798

Here is a piece of log that is present in failed run, but not in
a successful run:

2024-12-17T19:30:12.9010943Z [ 5.285022] sched_ext: BPF scheduler "dsp_local_on" enabled
2024-12-17T19:30:13.9022892Z ERR: dsp_local_on.c:37
2024-12-17T19:30:13.9025841Z Expected skel->data->uei.kind == EXIT_KIND(SCX_EXIT_ERROR) (0 == 1024)
2024-12-17T19:30:13.9256108Z ERR: exit.c:30
2024-12-17T19:30:13.9256641Z Failed to attach scheduler
2024-12-17T19:30:13.9611443Z [ 6.345087] smpboot: CPU 1 is now offline

Could you please investigate?

Thanks.