From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Paul E. McKenney" Subject: Re: linux-next: Tree for Aug 22 Date: Tue, 22 Aug 2017 12:32:31 -0700 Message-ID: <20170822193231.GF11320@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> Reply-To: paulmck@linux.vnet.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20170823051216.34f2c09f@canb.auug.org.au> Sender: linux-kernel-owner@vger.kernel.org To: Stephen Rothwell Cc: Linux-Next Mailing List , Linux Kernel Mailing List , ppc-dev , Nicholas Piggin List-Id: linux-next.vger.kernel.org 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" 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 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