linux-kernel - Re: linux-next: Tree for Aug 22

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Message-Id: <20170822193231.GF11320@linux.vnet.ibm.com>
Date:   Tue, 22 Aug 2017 12:32:31 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: linux-next: Tree for Aug 22

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@...ux.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@...b.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