From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 492E9C432C2 for ; Wed, 25 Sep 2019 16:48:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 26154207E0 for ; Wed, 25 Sep 2019 16:48:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732938AbfIYQsb (ORCPT ); Wed, 25 Sep 2019 12:48:31 -0400 Received: from fieldses.org ([173.255.197.46]:60650 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731087AbfIYQsb (ORCPT ); Wed, 25 Sep 2019 12:48:31 -0400 Received: by fieldses.org (Postfix, from userid 2815) id 3786C1510; Wed, 25 Sep 2019 12:48:31 -0400 (EDT) Date: Wed, 25 Sep 2019 12:48:31 -0400 To: Kevin Vasko Cc: linux-nfs@vger.kernel.org Subject: Re: NFSv4 client locks up on larger writes with Kerberos enabled Message-ID: <20190925164831.GA9366@fieldses.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) From: bfields@fieldses.org (J. Bruce Fields) Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On Wed, Sep 18, 2019 at 06:36:13PM -0500, Kevin Vasko wrote: > We have a new Dell EMC Unity 300 acting as NAS Server that is > presenting a NFSv4 NFS Share. Our clients are mostly Ubuntu 18.04.3 > but issue is also present on CentOS 7.6 systems. We have been > struggling with this issue for over a week now and not sure how to > resolve it. > > > > We are having trouble with NFS Clients completing their writes to the > Dell EMC Unity 300 NFS Server when Kerberos is enabled on the NFS > Share. I created the NFS Share on the U300, associated it with our > FreeIPA (Kerberos/LDAP server) and everything shows successful. Troubleshooting ideas off the top of my head: It might be worth trying some other client versions if it's not hard. It'd be interesting to know what's happening on the network.... Unfortunately big krb5p writes won't be fun to try to capture and examine. Maybe some network or rpc-level statistics would help show if there are an unusual number of retries or failures. --b.