linux-kernel - Re: Major KVM issues with kernel 4.5 on the host

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Message-ID: <20160414052220.GE7600@torres.zugschlus.de>
Date:	Thu, 14 Apr 2016 07:22:20 +0200
From:	Marc Haber <mh+linux-kernel@...schlus.de>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
	kvm ML <kvm@...r.kernel.org>
Subject: Re: Major KVM issues with kernel 4.5 on the host

On Thu, Apr 14, 2016 at 03:16:29AM +0200, Paolo Bonzini wrote:
> On 14/04/2016 00:29, Marc Haber wrote:
> > On Wed, Apr 13, 2016 at 10:36:34PM +0200, Paolo Bonzini wrote:
> >> Didn't help, but a fresh look at the list of 4.5 patches helped.
> >> What the hell was I thinking, I missed write_rdtscp_aux who
> >> obviously uses MSR_TSC_AUX.
> > 
> > I applied this patch to 4.5, which didn't go cleanly, I had to do it
> > manually, and there is no change in behavior. Sometimes, the Vm just
> > crashes, but most times the filesystem is remounted ro.
> 
> Ok, then I guess bisection is needed.  Please first try commit
> 45bdbcfdf241.  If it fails, then the bug come together with KVM's merge
> window changes for 4.5-rc1.  Please apply the patch I sent here when
> bisection is past 46896c73c1a4dde527c3a3cc43379deeb41985a1 (which means
> that probably that should be the commit you try second; the bisection
> then becomes much easier).

I have never bisected this deeply. Can you please give more advice,
with which two commits to start? And how do I find out whether I am
"past" a commit? I am als not a git expert, a few command lines would
be appreciated.

Things have not become any easier this night; 4.5-rc7 ran for more
than three hours before it failed :-(

Greetings
Marc

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