linux-kernel - Re: Current mainline git (24e700e291d52bd2) hangs when building e.g. perf

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Message-ID: <20170908094815.GA278@x4>
Date:   Fri, 8 Sep 2017 11:48:15 +0200
From:   Markus Trippelsdorf <markus@...ppelsdorf.de>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: Current mainline git (24e700e291d52bd2) hangs when building e.g.
 perf

On 2017.09.08 at 11:16 +0200, Borislav Petkov wrote:
> On Fri, Sep 08, 2017 at 10:05:36AM +0200, Borislav Petkov wrote:
> > On Fri, Sep 08, 2017 at 08:26:44AM +0200, Thomas Gleixner wrote:
> > > On Fri, 8 Sep 2017, Markus Trippelsdorf wrote:
> > > 
> > > CC+ Borislav. He might have access to such a beast
> > 
> > Can I have /proc/cpuinfo and dmesg pls, in order to see whether I have
> > something similar?
> > 
> > Private mail's fine too.
> 
> So I don't have exactly your model - mine is model 2, stepping 3 but I see
> something strange too, in dmesg:

I'm pretty sure the bug is in the merged 'x86-mm-for-linus' branch:
Either Andy's "PCID optimized TLB flushing" (would be my guess) or
'encrypted memory' support by Tom Lendacky.

(Bisecting is hard, because sometimes I can compile stuff for over 15
minutes without hitting the bug. At other times the machine locks up
hard when starting X11 already.)

-- 
Markus