From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) (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 4F84F32F757 for ; Tue, 2 Sep 2025 08:08:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756800522; cv=none; b=qsVyhnaiFb6xDbIXLxzD9TDg38rLqVkJEzIVjdhVe0FzoglBy+MwF9i9QBeNEIfHRtyAkaWTmoI/uWVTOtd/DeDOnBmGUCds+tyhjTGS445mcTvfTGMA6Y3dzWNtWVurjvZ0vs7mcct+llca1PAJEiKLvmtPCWnQJaVAPPMH5+0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756800522; c=relaxed/simple; bh=qbro9DR9KvkbcPWOFnfFJ1ltcCdjKB6XeyDy9QzDW08=; h=Message-ID:Date:MIME-Version:Subject:To:CC:References:From: In-Reply-To:Content-Type; b=sF+RwB9egISdKAYUaWyaTvcilPnDUUW40+oCuM1vpshg+MY8XvNFah+Qroh156fw/L0hhzS471MJPttklicIY0M5C7NN6RyVE9UQGHmrmKDWVtOl2cJLgz5N7c0aHPNkQ2LNYX3vtD626MsCQ4oJOsHYhrqWKIpbuHnRYz6RtA8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.162.254]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4cGJCz6t4YzPqkf; Tue, 2 Sep 2025 16:03:59 +0800 (CST) Received: from dggemv705-chm.china.huawei.com (unknown [10.3.19.32]) by mail.maildlp.com (Postfix) with ESMTPS id 7C01218049C; Tue, 2 Sep 2025 16:08:36 +0800 (CST) Received: from kwepemn500008.china.huawei.com (7.202.194.149) by dggemv705-chm.china.huawei.com (10.3.19.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 2 Sep 2025 16:08:29 +0800 Received: from [10.67.110.89] (10.67.110.89) by kwepemn500008.china.huawei.com (7.202.194.149) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 2 Sep 2025 16:08:28 +0800 Message-ID: <6c22bdba-00d2-4f5a-a83e-de7dfbf92f22@huawei.com> Date: Tue, 2 Sep 2025 16:08:08 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] sched/fair: Fix division-by-zero error in task_scan_max() To: , , , , , CC: , , , , References: <20250827123427.1229183-1-xiafukun@huawei.com> Content-Language: en-US From: Xia Fukun In-Reply-To: <20250827123427.1229183-1-xiafukun@huawei.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: kwepems200001.china.huawei.com (7.221.188.67) To kwepemn500008.china.huawei.com (7.202.194.149) On 8/27/2025 8:34 PM, Xia Fukun wrote: > The error can be reproduced by following these steps: > First, set sysctl_numa_balancing_scan_size to 0: > > echo 0 > /sys/kernel/debug/sched/numa_balancing/scan_size_mb > > Then trigger the clone system call, for example, by using > pthread_create to create a new thread. > > Oops: divide error: 0000 [#1] SMP NOPTI > CPU: 11 UID: 0 PID: 1 Comm: systemd Tainted: G S 6.17.0xfk_v2 #6 > Tainted: [S]=CPU_OUT_OF_SPEC > Hardware name: SuperCloud R5210 G12/X12DPi-N6, BIOS 1.1c 08/30/2021 > RIP: 0010:task_scan_max+0x24/0x190 Gentle ping ...