linux-kernel - Re: bisected - arm64 kvm unit test failures

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Message-ID: <864lgey2ja.wl-marc.zyngier@arm.com>
Date:   Wed, 01 Aug 2018 08:22:17 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Mike Galbraith <efault@....de>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: bisected - arm64 kvm unit test failures

On Wed, 01 Aug 2018 07:02:25 +0100,
Mike Galbraith <efault@....de> wrote:
> 
> [1  <text/plain; ISO-8859-15 (7bit)>]
> On Wed, 2018-08-01 at 06:35 +0100, Marc Zyngier wrote:
> > 
> > Is it something that is reproducible with the current mainline (non-RT)?
> 
> These waters are a bit muddy, it's config dependent.  I'm trying to
> generate a reproducing !RT config for -rc7 as we speak.  If I build
> openSUSE/master-default, it does NOT reproduce.  That with the bisect
> config just finished building, and.... yup, it reproduced
> (attached).

Thanks for that.

> 
> Every RT tree 4.16..master.today reproduces, and is fixed up (modulo
> the RT specific failure) by reverting the fingered commit.
> 
> > Pretty worrying. What HW is that on?
> 
> Box is a 4 node/64 core TaiShan 2280.

Is that what is also known as D05/HIP07, with 64 Cortex-A72? If so, I
think we have one somewhere... I'll try to reproduce it once I'm back
into the office (things seem to run just fine on my A72-based laptop,
so it definitely smells of being config dependent).

Cheers,

	M.

-- 
Jazz is not dead, it just smell funny.