linux-kernel - Re: [PATCH sched_ext/for-6.13-fixes] sched_ext: Fix invalid irq restore in scx_ops

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Message-ID: <HdoCQccNk3GZdnPx5w1vuAfOMMgtWeUgrUhn_e8B-hyRrWoOPakTGcoI3Q4-QmK_44msuvivoRUykxxeB82uR-S3enkmFaQl2t6Zgu-Nq6Y=@pm.me>
Date: Tue, 17 Dec 2024 23:44:08 +0000
From: Ihor Solodrai <ihor.solodrai@...me>
To: Tejun Heo <tj@...nel.org>
Cc: David Vernet <void@...ifault.com>, sched-ext@...a.com, kernel-team@...a.com, linux-kernel@...r.kernel.org, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH sched_ext/for-6.13-fixes] sched_ext: Fix invalid irq restore in scx_ops_bypass()

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.