From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E5E38126C04; Thu, 3 Oct 2024 09:27:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727947637; cv=none; b=G+w0NgHSNqFWKckD1KS2cGUay91CRUnipSgcM3KW6Aes1/KAWvEmIw6HPaRtjK9pCGeMCApGmANhU001sBx6tJEGGt4G6sn0xj6EGZmRKudRcs+ZFQ0LRzEnpZKyvEpKvb88xip5G4yh6p9Qa+CjwTmyH/GRD0PakgS87LadZTU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727947637; c=relaxed/simple; bh=v2DLEkaQU1mAYgqzcVPj46Crex+ZbOb09Ug0wOH9ZzQ=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=EN26hKQBMo7NALXqVgKJ56E9CS73648oRWimWKIbqslWOLTiP5bGGPV+d1SrQADC6YfnavyAvnMKUBtoEAvXuSNyp/y2uZC0zZDGu33GeRQdvWG1+gwtzvSVGvaFQjC8JATW3VEfI5JgfOqp0FSKKkk59YrvKLBsizsRi1i0PCI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=Tbk0Y9Db; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Tbk0Y9Db" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=IF8zwr/DjoAOJ3c4WgGGLwsmUP9CVcST1MKLE/ddVlI=; b=Tbk0Y9DbA9OqFUEGo4ATCUDoeu kwWh3MBXI74JobZCclQxHjMMU+s9o7oa0vZl91mB9LjRgGP8L8JEyqHK96ybLGh84glI+YW64dHpy hlBZ4QBXvKGthe2Emld96dG9Zg3jD0bMO4zCJHRvKfwfrcG8nrPaLGcVHpbIG5dVI+S6nIgQOvklo IMkUO5inKlKAFN8Sy9OkGbSGfOcunhwnYYIFZFZTs/gGzrYM8PYXXZi58hRBPK0aZqmgrdiNA3Kc3 TrlI+p6GJHPK1CHRST2I/5HX6hSFihox8gyD3bMFo1qBp2yvoakOVz7EsWlXjV1ZlbgQeLBHaLiUX xBwj3U0g==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1swI72-00000003fC6-2DFn; Thu, 03 Oct 2024 09:27:08 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id C227F30083E; Thu, 3 Oct 2024 11:27:07 +0200 (CEST) Date: Thu, 3 Oct 2024 11:27:07 +0200 From: Peter Zijlstra To: "Paul E. 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: <20241003092707.GD33184@noisy.programming.kicks-ass.net> References: <20241003084039.GS5594@noisy.programming.kicks-ass.net> <20241003084743.GC33184@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: <20241003084743.GC33184@noisy.programming.kicks-ass.net> 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 :/