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 6EF6E2116E4; Wed, 22 Jan 2025 10:59:55 +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=1737543596; cv=none; b=ugAtDwZA05M9iOYv/HvrRA5LXzh0/Ul0gTjLFnokKauelyFVJWE84dNILoE9n0MWNHQlArJrkvDDBlmXvnvTmaZiioZjnZzR7ATpc9KCDc2ZM+CIzEooo5ZH9qfYD089mFxPIqSH7Mbf9XWhirNXnexx9WKK9khedbazgSqTc7c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737543596; c=relaxed/simple; bh=T8CQvqwd8AofzYH/VgqLK0Y1sG2g7HNXXWQE5zvB61Q=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=sX5VUK3IDCPZHyWD3quAp6vy2XNxnwz5F4P900FKoXLJSs8vEP5gKBABV+ycJn3lHdN1e/lG1k+3n/atgK5G/gAYz/b46ykoG4Sz02KkGHqVVKwR/Dzu6+eHSYDuiyVjBccgaW459di5Tcn8JY1l/mTYB60XOPI5VMIApvA4pEM= 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=Fm9OBiJH; 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="Fm9OBiJH" 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=mkBKPInsrTFLae2VqPxAH4vEoUXMWWF4sBsGV785GTA=; b=Fm9OBiJHVWyW8EX7uaBNTY/6Ay wTO5/nBbPHWOcDZXTclzKldhAdc4nXJ4M64/26VSTx8GSP/N5nDA22uMYTx2oSyumL8nTJjH9zJSg stzyJ+O675cnEx3kpNNPh4YphZSzPRG/jLWP9Qrh7k9tliKPVskqKAMLh0JcPt9UuQos2cUEcpBLx HS0LiV7U9m3XFzp1hIiCaTUrRhCpBNz7Wa752eli4vmrEp5qkG36NBFedSQzh8Zn+wLQ42+Njx6u1 hXLbf8BPZ9BkozWjacEeG5nNz7r3lkge+oG1w5xvttlVKFEI5D+5tsC3Sb0xsaAf0wfW0Y08Z8xU+ 0HTcB0GQ==; Received: from 77-249-17-89.cable.dynamic.v4.ziggo.nl ([77.249.17.89] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1taYSc-0000000DXzT-2RBW; Wed, 22 Jan 2025 10:59:51 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 1A5DA300599; Wed, 22 Jan 2025 11:59:50 +0100 (CET) Date: Wed, 22 Jan 2025 11:59:49 +0100 From: Peter Zijlstra To: Arnd Bergmann Cc: Naresh Kamboju , Greg Kroah-Hartman , stable@vger.kernel.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org, Linus Torvalds , Andrew Morton , Guenter Roeck , shuah , patches@kernelci.org, lkft-triage@lists.linaro.org, Pavel Machek , Jon Hunter , Florian Fainelli , Sudip Mukherjee , srw@sladewatkins.net, rwarsow@gmx.de, Conor Dooley , hargar@microsoft.com, Mark Brown , Anders Roxell , Vincent Guittot , Dan Carpenter Subject: Re: [PATCH 6.12 000/122] 6.12.11-rc1 review Message-ID: <20250122105949.GK7145@noisy.programming.kicks-ass.net> References: <20250121174532.991109301@linuxfoundation.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Jan 22, 2025 at 11:56:13AM +0100, Arnd Bergmann wrote: > On Wed, Jan 22, 2025, at 11:04, Naresh Kamboju wrote: > > On Tue, 21 Jan 2025 at 23:28, Greg Kroah-Hartman > > wrote: > > > 0000000000000000 > > <4>[ 160.712071] Call trace: > > <4>[ 160.712597] place_entity (kernel/sched/fair.c:5250 (discriminator 1)) > > <4>[ 160.713221] reweight_entity (kernel/sched/fair.c:3813) > > <4>[ 160.713802] update_cfs_group (kernel/sched/fair.c:3975 (discriminator 1)) > > <4>[ 160.714277] dequeue_entities (kernel/sched/fair.c:7091) > > <4>[ 160.714903] dequeue_task_fair (kernel/sched/fair.c:7144 (discriminator 1)) > > <4>[ 160.716502] move_queued_task.isra.0 (kernel/sched/core.c:2437 > > (discriminator 1)) > > I don't see anything that immediately sticks out as causing this, > but I do see five scheduler patches backported in stable-rc > on top of v6.12.8, these are the original commits: > > 66951e4860d3 ("sched/fair: Fix update_cfs_group() vs DELAY_DEQUEUE") This one reworks reweight_entity(), but I've been running with that on top of 13-rc6 for a week or so and not seen this.