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 944311B4236 for ; Tue, 30 Sep 2025 12:56:32 +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=1759236994; cv=none; b=HDpUNL8pbLyyQx/vBfW9viBiDBT4oMjjS2CDxlym72NSB7g4Eme97Mx2ka0znxAF/KbK4mLwgm/01baYbj6oa6N1HDrtaSNfD7vsrRw1HJ/pFX78NW0xjJwcNm2Tt0b30/5zgDbFdKmVCYXxB5giYYMoR0w3PQuk9NGpJHafTaE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759236994; c=relaxed/simple; bh=wuaEAs+MU1Pb9iRm11gp6YbHtZtL01yl1DyTQQnqHYc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=TT3J5mwyQRlDcOV9jCVo+vy7A6IWLN+aVhc0Ga7kgaxQ+HfiN9789TXnBC2SGsYm7YbqOlGHR7UD9qcIKAsY4f88VMZj4+4DcUR0fYWqlT9to2mP9Yt1ZM6zhc0NVfRsnJ0piMsrjIaNB2eAKarSBhqA59PNqT6JGSFp2jrXl7w= 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=kd34YU7l; 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="kd34YU7l" 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=Q6hpUN6CbROxQUt5hksPnXbH91Pde7bn8IYk5dCRDS4=; b=kd34YU7ltg0x9Af15t1xvzVcZT pncB5xeX3ktq+CTRx31FP9Ha1cSUsS0PdX6S5n7bmjIReIW0hRC7E+kkgSh/gUit5EUFo1+CsFoaf 1sHORkZb0qDNtyAXO33PSJLQSsFaQRiKEdsZZpz/dZ6aJxMkbQDSML0rHS2iZnBwJ2r+eL+CIFXco 44mbSyzxDZLwWJCvvDt3cehdDW4MqujnyagGpcfrZlVGpnUyjK6VqhytOp75PzvKtemi490nZp6RF Kfdaeyg7ZRTjQgcbMxq+093CLNEwBgnlvVsFgNEsiYlJd6yDFkc9JCYNTJTIWUwkLCMdY8wYNspke 9a6AIkDw==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1v3Zu1-0000000CqDm-45oY; Tue, 30 Sep 2025 12:56:22 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 8A77D300220; Tue, 30 Sep 2025 14:56:21 +0200 (CEST) Date: Tue, 30 Sep 2025 14:56:21 +0200 From: Peter Zijlstra To: Han Guangjiang Cc: Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , "open list:SCHEDULER" , hanguangjiang@lixiang.com, fanggeng@lixiang.com, yangchen11@lixiang.com Subject: Re: [PATCH] sched/fair: Fix DELAY_DEQUEUE issue related to cgroup throttling Message-ID: <20250930125621.GO3419281@noisy.programming.kicks-ass.net> References: Precedence: bulk X-Mailing-List: linux-kernel@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: On Thu, Sep 04, 2025 at 09:51:50AM +0800, Han Guangjiang wrote: > From: Han Guangjiang > > When both CPU cgroup and memory cgroup are enabled with parent cgroup > resource limits much smaller than child cgroup's, the system frequently > hangs with NULL pointer dereference: Is this the same issue as here: https://lore.kernel.org/all/105ae6f1-f629-4fe7-9644-4242c3bed035@amd.com/T/#u ?