linux-kernel - Re: [GIT PULL] scheduler changes for v4.11

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Message-ID: <CA+55aFxtTX7_ob=Ca4iWD-NDQVESRC8m8tWq=HsbUb_akHF79A@mail.gmail.com>
Date:   Wed, 22 Feb 2017 12:41:01 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Ingo Molnar <mingo@...nel.org>,
        Matt Fleming <matt@...eblueprint.co.uk>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mike Galbraith <efault@....de>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] scheduler changes for v4.11

Hmm. The scheduler changes seem to show problems with suspend/resume.

I now get his when suspending:

  ...
  Disabling non-boot CPUs ...
  Cannot set affinity for irq 285
  smpboot: CPU 1 is now offline
  ------------[ cut here ]------------
   WARNING: CPU: 2 PID: 25 at kernel/sched/sched.h:812
update_load_avg+0x779/0xa70
  rq->clock_update_flags < RQCF_ACT_SKIP
  ...
  Call Trace:
    update_load_avg+0x779/0xa70
    set_next_entity+0xd9/0x220
    pick_next_task_fair+0x88/0x550
    sched_cpu_dying+0x1cf/0x2a0
    cpuhp_invoke_callback+0x80/0x3b0
    take_cpu_down+0x5e/0xa0
    multi_cpu_stop+0xb6/0xe0

the issue may have been going on for a while, but the new WARN_ON()
was added in this merge window.

(Not sure how consistent this warning is, it definitely doesn't happen
every time, I've only seen it once)

                  Linus