linux-kernel - Re: Linux 5.3-rc7

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Date:   Sat, 07 Sep 2019 15:41:19 +0100
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Bandan Das <bsd@...hat.com>
Subject: Re: Linux 5.3-rc7

Quoting Thomas Gleixner (2019-09-07 15:29:19)
> On Sat, 7 Sep 2019, Chris Wilson wrote:
> > Quoting Linus Torvalds (2019-09-02 18:28:26)
> > > Bandan Das:
> > >       x86/apic: Include the LDR when clearing out APIC registers
> > 
> > Apologies if this is known already, I'm way behind on email.
> > 
> > I've bisected
> > 
> > [   18.693846] smpboot: CPU 0 is now offline
> > [   19.707737] smpboot: Booting Node 0 Processor 0 APIC 0x0
> > [   29.707602] smpboot: do_boot_cpu failed(-1) to wakeup CPU#0
> > 
> > https://intel-gfx-ci.01.org/tree/drm-tip/igt@perf_pmu@cpu-hotplug.html
> > 
> > to 558682b52919. (Reverts cleanly and fixes the problem.)
> > 
> > I'm guessing that this is also behind the suspend failures, missing
> > /dev/cpu/0/msr, and random perf_event_open() failures we have observed
> > in our CI since -rc7 across all generations of Intel cpus.
> 
> So is this on bare metal or in a VM?

Our single virtualised piece of kit doesn't support cpu hotplug, so this
test is not being run. We have failures on
icl (2019), glk (2017), kbl (2017), bxt (2016), skl (2015),
bsw (2016), hsw (2013), byt (2013), snb (2011), elk (2008),
bwr (2006), blb (2007)
-Chris