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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 8DB61C2D0A3 for ; Mon, 26 Oct 2020 14:54:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5605C2463C for ; Mon, 26 Oct 2020 14:54:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1782263AbgJZOyK (ORCPT ); Mon, 26 Oct 2020 10:54:10 -0400 Received: from etc.inittab.org ([51.254.149.154]:45050 "EHLO etc.inittab.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1782085AbgJZOyF (ORCPT ); Mon, 26 Oct 2020 10:54:05 -0400 Received: from var.inittab.org (249.171.116.91.static.reverse-mundo-r.com [91.116.171.249]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) (Authenticated sender: smtp_auth_agi@correo-e.org) by etc.inittab.org (Postfix) with ESMTPSA id 2B0EBA10BA; Mon, 26 Oct 2020 15:54:04 +0100 (CET) Received: by var.inittab.org (Postfix, from userid 1000) id 3E95B404E9; Mon, 26 Oct 2020 15:54:03 +0100 (CET) Date: Mon, 26 Oct 2020 15:54:03 +0100 From: Alberto Gonzalez Iniesta To: "J. Bruce Fields" Cc: linux-nfs@vger.kernel.org, Miguel Rodriguez , Isaac Marco Blancas Subject: Re: Random IO errors on nfs clients running linux > 4.20 Message-ID: <20201026145403.GN74269@var.inittab.org> References: <20200429171527.GG2531021@var.inittab.org> <20200430173200.GE29491@fieldses.org> <20200909092900.GO189595@var.inittab.org> <20200909134727.GA3894@fieldses.org> <20201026134216.GK74269@var.inittab.org> <20201026141452.GA2417@fieldses.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20201026141452.GA2417@fieldses.org> Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On Mon, Oct 26, 2020 at 10:14:52AM -0400, J. Bruce Fields wrote: > Sorry, I just don't know what this is off the top of my head. If I had > the time, stuff I might try: > > - look at the wire traffic with wireshark: try to figure out > which operation this is happening on, and if there's anything > unusual about the reply. May be difficult if a lot of traffic > is required to reproduce. > - if you're using krb5, try without just to see if that makes a > difference. Using "sec=krb5p" here... And with lots of active clients. :-/ Oh! Could I add another entry in /etc/exports with krb5 without afecting current krb5p clients? > - look at history: gitk v4.19..v4.20.17 fs/nfs net/sunrpc, see > if anything looks relevant; or even just try a git bisect > (difficult again given the intermittent failure). > - trace through the code to work out where call_decode might be > returning -EIO, try to narrow it down with tracepoints or even > just debugging printk's. I'm afraid I don't have the skills to carry out those tasks, haven't coded in C for decades, not to mention kernel/nfs hacking. I guess we'll have to wait until someone else hits this too, or we update the server and (hopefully/miraculously) fixes it self :-) Thanks a lot, Alberto -- Alberto González Iniesta | Universidad a Distancia alberto.gonzalez@udima.es | de Madrid