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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 465F1C282C0 for ; Fri, 25 Jan 2019 19:51:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 18088218B0 for ; Fri, 25 Jan 2019 19:51:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726218AbfAYTvf (ORCPT ); Fri, 25 Jan 2019 14:51:35 -0500 Received: from mx2.math.uh.edu ([129.7.128.33]:46284 "EHLO mx2.math.uh.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725778AbfAYTvf (ORCPT ); Fri, 25 Jan 2019 14:51:35 -0500 Received: from epithumia.math.uh.edu ([129.7.128.2]) by mx2.math.uh.edu with esmtp (Exim 4.91) (envelope-from ) id 1gn7Vi-00030c-Ds; Fri, 25 Jan 2019 13:51:32 -0600 Received: by epithumia.math.uh.edu (Postfix, from userid 7225) id 55E31801554; Fri, 25 Jan 2019 13:51:30 -0600 (CST) From: Jason L Tibbitts III To: Trond Myklebust Cc: "Anna.Schumaker\@netapp.com" , "linux-nfs\@vger.kernel.org" , "Chuck.Lever\@oracle.com" Subject: Re: Need help debugging NFS issues new to 4.20 kernel References: Date: Fri, 25 Jan 2019 13:51:30 -0600 In-Reply-To: (Trond Myklebust's message of "Thu, 24 Jan 2019 19:58:40 +0000") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org >>>>> "TM" == Trond Myklebust writes: TM> Commit deaa5c96c2f7 ("SUNRPC: Address Kerberos performance/behavior TM> regression") was supposed to be marked for stable as a fix. I wonder, though; is that likely to be the root of the problem I'm seeing? The commit description talks about this as a performance regression, but I'm seeing a complete loss of NFS functionality. Sadly I still don't have a reproducer, so outside of just deploying the patch and hoping, I have no way to actually test this. So far I've been running things like: stress-ng --all 0 --class 'filesystem' -t 10m --times in an NFS4-krb5p mounted directory without being able to reproduce the problem. That drives the load up close to 200 but everything seems to make progress. So it must be some specific sequence that causes it; I just don't know which. I did get this to show up in the kernel log, though, when I typed "df" while running that stress-ng command was running: [94547.656419] NFS: server nas00 error: fileid changed fsid 0:57: expected fileid 0x6bc27eb, got 0x9996c6 I've never seen that one before, but it doesn't seem to hurt anything. (This is still with 4.20.3.) - J<