From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from szxga04-in.huawei.com (szxga04-in.huawei.com [45.249.212.190]) (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 901D519D8A7; Wed, 2 Jul 2025 09:04:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.190 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751447075; cv=none; b=ccecAXkFG+433ZDuDo2kBPbngJLDkj49ZLakkDhEXX+Uj/DoT+zwpXuxz2JO7ZwT5hKdykvoPDjTemYXnryBUW1gm36AL7HEHbJiXKau1vSahF7/hw0D6LT8uhaKWB3w4pzH/t4FPXJad8bBAmnjv7augLMuaB8U+fKjwwRZP5g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751447075; c=relaxed/simple; bh=kcztfJkBZkuN7XUV0CYXcYL9JZrdKKPYOBrbgy9LZO0=; h=Message-ID:Date:MIME-Version:Subject:To:CC:References:From: In-Reply-To:Content-Type; b=RaZE06guKUbkH893VvqOLVSsckoSvsdk0o8UCGNJSZz7P1654IBz5YyeAMo+IRhcIPQzR/hC7dIq9AhY1KiirY/Cy/U6DhJGyQtLBL0yAH8sUaucd8h7AY1h2viAbkSsl4nSOeHKZjwXRtp9dpaGHsLyxct1QBYcahHUBKdPJAE= 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=45.249.212.190 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 [172.19.88.214]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4bXDSM0c2Mz2TSrp; Wed, 2 Jul 2025 17:02:43 +0800 (CST) Received: from dggemv712-chm.china.huawei.com (unknown [10.1.198.32]) by mail.maildlp.com (Postfix) with ESMTPS id 52FBA1A016C; Wed, 2 Jul 2025 17:04:29 +0800 (CST) Received: from kwepemn200010.china.huawei.com (7.202.194.133) by dggemv712-chm.china.huawei.com (10.1.198.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Wed, 2 Jul 2025 17:04:29 +0800 Received: from [10.174.178.56] (10.174.178.56) by kwepemn200010.china.huawei.com (7.202.194.133) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Wed, 2 Jul 2025 17:04:28 +0800 Message-ID: Date: Wed, 2 Jul 2025 17:04:27 +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: [QUESTION] problems report: rcu_read_unlock_special() called in irq_exit() causes dead loop To: Joel Fernandes , , "Xiongfeng Wang" CC: Joel Fernandes , , Frederic Weisbecker , Boqun Feng , , , , , "Wangshaobo (bobo)" , Xie XiuQi References: <9acd5f9f-6732-7701-6880-4b51190aa070@huawei.com> <3ce6f3ce-5dfb-8c59-cb7b-4619b70f8d25@huawei.com> <20250603185939.GA1109523@joelnvbox> <066e8121-c6c5-48ac-b35a-e6430d986dff@nvidia.com> <09e4d018-3db4-404e-a8f0-041cdee15a62@huawei.com> <279d2f06-d4f7-46e1-9678-999a2d19b710@nvidia.com> Content-Language: en-GB From: Qi Xi In-Reply-To: <279d2f06-d4f7-46e1-9678-999a2d19b710@nvidia.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: kwepems500001.china.huawei.com (7.221.188.70) To kwepemn200010.china.huawei.com (7.202.194.133) Hi Joel, After applying those 2 patches on the latest kernel, the problem still occurs. Compared to the previous version which solves this problem, the difference is the following: On 2025/7/1 21:29, Joel Fernandes wrote: > > On 7/1/2025 5:20 AM, Qi Xi wrote: >> Hello everyone, >> >> Friendly ping about this problem :) >> > Ah, thanks for checking. The fix is slated for kernel 6.17. > > If you want to test it, could you apply it in advance from the RCU tree? > > You need these 2: > > https://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git/commit/?h=next&id=6758c93749f8bf09b9282f100c5dd0a5c501f91c > > https://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git/commit/?h=next&id=3cd298bf3bb69e3bca6abfe97e1b44ffa37f3dee > > Thanks.