linux-kernel - Re: KVM selftests are failing

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Message-ID: <20181115090203.5z25gwa2yznj6mmu@kamzik.brq.redhat.com>
Date:   Thu, 15 Nov 2018 10:02:03 +0100
From:   Andrew Jones <drjones@...hat.com>
To:     Ahmed Soliman <ahmedsoliman@...a.vt.edu>
Cc:     Anders Roxell <anders.roxell@...aro.org>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: KVM selftests are failing

On Wed, Nov 14, 2018 at 11:29:59PM +0200, Ahmed Soliman wrote:
> Hello again,
> On Wed, Nov 14, 2018 at 9:23 PM Ahmed Soliman <ahmedsoliman@...a.vt.edu> wrote:
> > I don't do a make clean normally, but I will do it this time when
> > bisecting, also I only use shallow
> >  clones so it will also take some time pulling. Also to note, The arch
> > I am using is Haswell, I am not
> > sure if that should make any difference though.
> 
> I started bisecting from commit 783e9e51266ebb7f78c606a53cb0fa41bb7c31a0
> which introduces kvm selftests. I started from complete clean kernel build and
> run, but unfortunately, I got the Assert there too.

I think you should be able to pre-compile the selftests and save them,
and then bisect the kernel further back than their introduction. Actually
you may want to simplify the test case to just a mmap/madvise pair and
see if that reproduces, since kvm selftests doesn't do much more than
that. (Other than all the /dev/kvm ioctls - you have the right perms
on /dev/kvm, or are running as root, right?)

Thanks,
drew