From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <paulmck@linux.vnet.ibm.com>
Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com
 [148.163.156.1])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by lists.ozlabs.org (Postfix) with ESMTPS id 3xcLLB5dT7zDqDF
 for <linuxppc-dev@lists.ozlabs.org>; Wed, 23 Aug 2017 05:32:34 +1000 (AEST)
Received: from pps.filterd (m0098393.ppops.net [127.0.0.1])
 by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id
 v7MJSi7Z055084
 for <linuxppc-dev@lists.ozlabs.org>; Tue, 22 Aug 2017 15:32:31 -0400
Received: from e12.ny.us.ibm.com (e12.ny.us.ibm.com [129.33.205.202])
 by mx0a-001b2d01.pphosted.com with ESMTP id 2cgqxxhgna-1
 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT)
 for <linuxppc-dev@lists.ozlabs.org>; Tue, 22 Aug 2017 15:32:31 -0400
Received: from localhost
 by e12.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only!
 Violators will be prosecuted
 for <linuxppc-dev@lists.ozlabs.org> from <paulmck@linux.vnet.ibm.com>;
 Tue, 22 Aug 2017 15:32:30 -0400
Date: Tue, 22 Aug 2017 12:32:31 -0700
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Linux-Next Mailing List <linux-next@vger.kernel.org>,
 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
 ppc-dev <linuxppc-dev@lists.ozlabs.org>,
 Nicholas Piggin <npiggin@gmail.com>
Subject: Re: linux-next: Tree for Aug 22
Reply-To: paulmck@linux.vnet.ibm.com
References: <20170822183816.7925e0f8@canb.auug.org.au>
 <20170823041117.780097f7@canb.auug.org.au>
 <20170823041424.1dddeb2d@canb.auug.org.au>
 <20170822185923.GE11320@linux.vnet.ibm.com>
 <20170823051216.34f2c09f@canb.auug.org.au>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
In-Reply-To: <20170823051216.34f2c09f@canb.auug.org.au>
Message-Id: <20170822193231.GF11320@linux.vnet.ibm.com>
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>

On Wed, Aug 23, 2017 at 05:12:16AM +1000, Stephen Rothwell wrote:
> Hi Paul,
> 
> On Tue, 22 Aug 2017 11:59:23 -0700 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
> >
> > On Wed, Aug 23, 2017 at 04:14:24AM +1000, Stephen Rothwell wrote:
> > > Hi all,
> > > 
> > > On Wed, 23 Aug 2017 04:11:17 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:  
> > > >
> > > > This tree fails to boot on my qemu test.  2 boot logs attached.
> > > > 
> > > > Paul, Nick, is this the same/similar to the other RCU/lockup bug you
> > > > are chasing.  This is the first time I have seen this failure.
> > > > 
> > > > This qemu boot is in full emulation mode if I add --enable-kvm to the
> > > > qemu command, it does not fail to boot.  (the test just boots and then shuts down)  
> > > 
> > > Boot logs attached this time.  
> > 
> > That does not look good!
> > 
> > Given that the hard lockup happened during timer lock acquisition, I
> > have to ask if you built with lockdep...
> 
> $ grep LOCKDEP .config
> CONFIG_LOCKDEP_SUPPORT=y
> 
> so, no.  This is just a powerpc pseries_le_defconfig build.

This is without Nick's recent patch, I am guessing?

Hmmm...  My testing of that patch omitted lockdep as well.  Rerunning
on the full set of rcutorture scenarios...

							Thanx, Paul