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Message-ID: <20241003092707.GD33184@noisy.programming.kicks-ass.net>
Date: Thu, 3 Oct 2024 11:27:07 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: vschneid@...hat.com, linux-kernel@...r.kernel.org, sfr@...b.auug.org.au,
	linux-next@...r.kernel.org, kernel-team@...a.com
Subject: Re: [BUG almost bisected] Splat in dequeue_rt_stack() and build error

On Thu, Oct 03, 2024 at 10:47:43AM +0200, Peter Zijlstra wrote:
> On Thu, Oct 03, 2024 at 10:40:39AM +0200, Peter Zijlstra wrote:
> > On Wed, Aug 21, 2024 at 02:57:16PM -0700, Paul E. McKenney wrote:
> > 
> > > My reproducer on the two-socket 40-core 80-HW-thread systems is:
> > > 
> > > tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 1m --configs "50*TREE03" --trust-make
> > > 
> > 
> > This gets me a very long stream of:
> > 
> > Results directory: /usr/src/linux-rcu/tools/testing/selftests/rcutorture/res/2024.10.03-09.30.33
> > tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 1m --configs 50*TREE03 --trust-make
> > TREE03 -------
> > QEMU error, output:
> > cat: /usr/src/linux-rcu/tools/testing/selftests/rcutorture/res/2024.10.03-09.30.33/TREE03/qemu-output: No such file or directory
> > TREE03.10 -------
> > QEMU error, output:
> > cat: /usr/src/linux-rcu/tools/testing/selftests/rcutorture/res/2024.10.03-09.30.33/TREE03.10/qemu-output: No such file or directory
> > ...
> > 
> > 
> > Did I not do it right?
> 
> Urgh, for some reason my machine doesn't auto load kvm_intel.ko and then
> proceeds to not do anything useful.. Let me try again.

Works a ton better now, obviously no splat yet :/

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