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Date: Tue, 22 Aug 2017 12:36:20 -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
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On Tue, Aug 22, 2017 at 12:32:31PM -0700, Paul E. McKenney wrote:
> 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...

To complete the thought, if you aren't already using it, I suggest
applying Nick's patch:

http://lkml.kernel.org/r/20170822084348.21436-1-npiggin@gmail.com

							Thanx, Paul