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McKenney" Cc: vschneid@redhat.com, linux-kernel@vger.kernel.org, sfr@canb.auug.org.au, linux-next@vger.kernel.org, kernel-team@meta.com Subject: Re: [BUG almost bisected] Splat in dequeue_rt_stack() and build error Message-ID: <20241003122824.GE33184@noisy.programming.kicks-ass.net> References: <20241003084039.GS5594@noisy.programming.kicks-ass.net> <20241003084743.GC33184@noisy.programming.kicks-ass.net> <20241003092707.GD33184@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: linux-next@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241003092707.GD33184@noisy.programming.kicks-ass.net> On Thu, Oct 03, 2024 at 11:27:07AM +0200, Peter Zijlstra wrote: > 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 :/ I have by now ran many hundreds of 1m TREE03 instances, and not yet seen anything. Surely I'm doing it wrong?