From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from canpmsgout03.his.huawei.com (canpmsgout03.his.huawei.com [113.46.200.218]) (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 1A80A23EA89; Fri, 6 Mar 2026 02:47:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=113.46.200.218 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772765230; cv=none; b=TAJMTjm/K35WuVGTX14TtxB857xUATll7q2zYoggWLFuF3Hh3fcH4JFZ51E0VTctNZ/CmuBGD4pkEX7C2FJ1/Htmcgta/ym9kVy72lHTKYa14KuRUsSbZwE/sI4eZKAGNHvyU0XR32fFWOtAUJdwcBRRI/yPJ0/Bvz5XxbYLIOU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772765230; c=relaxed/simple; bh=9/eClTh+JzBeyBcz/Qwseb7D9WH7kr/ukhBJs0hnfO4=; h=Message-ID:Date:MIME-Version:Subject:From:To:CC:References: In-Reply-To:Content-Type; b=mP6LGknz/AKbdUi/Gat8W2wp4v1JtDbB2AEBU7B1L/dMWhWPy+ElzWy+We9uJ4K3Anwks6AZs2Qwt3pzXVueizgaenO3Q9Yfhp6S3gBDspEo7XbXQBGWLNJGHFDEOCzjCMME1jOo5OsrV3b4iwnM+nsqHJS3sBdNOB6NMgSWnRs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=h-partners.com; dkim=pass (1024-bit key) header.d=h-partners.com header.i=@h-partners.com header.b=bb7G1vwz; arc=none smtp.client-ip=113.46.200.218 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=h-partners.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=h-partners.com header.i=@h-partners.com header.b="bb7G1vwz" dkim-signature: v=1; a=rsa-sha256; d=h-partners.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=9/eClTh+JzBeyBcz/Qwseb7D9WH7kr/ukhBJs0hnfO4=; b=bb7G1vwzRSM1odvKm4Ngf7yLoiZhg7Utx1PYXRecDj3RMlQ/fj0O5HYev2u7orYNmi1AxEpF2 8Azl5anJ4NjKP5ZBwhwYD1J7CdFI1GX6L1W8Im0YDjTzACcjs9C7wa2PWf2HfcrDY6y3K4LJo2O a5SfY8hEgJwwl3pxCtHWpos= Received: from mail.maildlp.com (unknown [172.19.162.140]) by canpmsgout03.his.huawei.com (SkyGuard) with ESMTPS id 4fRrK60w7pzpTJW; Fri, 6 Mar 2026 10:42:02 +0800 (CST) Received: from dggpemr100013.china.huawei.com (unknown [7.185.36.198]) by mail.maildlp.com (Postfix) with ESMTPS id 89EF02022B; Fri, 6 Mar 2026 10:47:04 +0800 (CST) Received: from [10.174.186.66] (10.174.186.66) by dggpemr100013.china.huawei.com (7.185.36.198) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.36; Fri, 6 Mar 2026 10:47:03 +0800 Message-ID: <23b52d16-4b74-43e4-9fff-73ac57c9ef89@huawei.com> Date: Fri, 6 Mar 2026 10:46:37 +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]nfs: never returned delegation From: "zhangjian (CG)" To: , , Jeff Layton CC: , References: <850dcbf562b7eb5848278937092d2d8511eb648f.camel@kernel.org> <1e1eadf5-fab9-4919-a71a-864aa7109c7b@huawei.com> In-Reply-To: <1e1eadf5-fab9-4919-a71a-864aa7109c7b@huawei.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: kwepems200001.china.huawei.com (7.221.188.67) To dggpemr100013.china.huawei.com (7.185.36.198) Hi experts on NFS: Recently we meet an error: 1.Nfs wait for sunrpc 2.Sunrpc send OPEN message and hang the rpc task onto sunrpc pending queue. 3.Server never reply, and since NFS_CS_NO_RETRANS_TIMEOUT is forced and connection is ESTABLISHED, task will never be retransmitted. This cause procedures waiting on this file hang forever. I know using "umount -f " to kill rpc task works. And the key to the problem most likely lies in the network layer. But should nfs retransmit it after waiting for so long? Wish for reply. Thanks Zhangjian