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via listexpand id S229482AbjKPRei (ORCPT + 99 others); Thu, 16 Nov 2023 12:34:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54908 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229468AbjKPRei (ORCPT ); Thu, 16 Nov 2023 12:34:38 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 63B4E1A8 for ; Thu, 16 Nov 2023 09:34:35 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C07C0C433C7; Thu, 16 Nov 2023 17:34:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700156075; bh=ak6RHvyO4O57o4RkrIYnir+pYq0YPShCsCqHmbNb4vg=; h=Subject:From:To:Date:In-Reply-To:References:From; b=QhoCgvTOLtVO8+L93YOQCTWFYqMz+8jDuZRl0b81/J98tMJCaSGq7MH1JMZOq57Vf E0fxNpRP+58ff8AbVTvQB6G1XwPCFvv9hE3MhSM46NYzCazHX6ibW91HMfIw6JNnz/ l1lWYO4DVtuYOgqTyUYyKJXAvlrJxmD6Tg4wTEtOVjtukYLnYQZRT1N/ZNxx3VJ53j AAS/xFd5YGYQGNqy22Tj6jJQ/WJNlGaPWF/+JkjwTUhUhwbqfRy4yNJxIFlo5LS0Xt ia0r07DTGltIlD/kse3hTYpKhCgFCuo5Ip1wAhjyH+usBQtwTPWMaRsOeJJMCE5Ewq KAx76Z0nMUEpg== Message-ID: <7f438929e552135a7fe81b75fa9a3382db1fce42.camel@kernel.org> Subject: Re: Blocklayoutdriver deadlock with knfsd From: Jeff Layton To: Benjamin Coddington , Linux NFS Mailing List Date: Thu, 16 Nov 2023 12:34:33 -0500 In-Reply-To: <3A3EABED-888C-40B1-9929-B4CCDB646BA0@redhat.com> References: <1CC82EC5-6120-4EE4-A7F0-019CF7BC762C@redhat.com> <3A3EABED-888C-40B1-9929-B4CCDB646BA0@redhat.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.1 (3.50.1-1.fc39) MIME-Version: 1.0 X-Spam-Status: No, score=-1.3 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Thu, 16 Nov 2023 09:34:47 -0800 (PST) On Thu, 2023-11-16 at 12:17 -0500, Benjamin Coddington wrote: > On 16 Nov 2023, at 12:11, Benjamin Coddington wrote: >=20 > > I ran into this old problem again recently, last discussed here: > > https://lore.kernel.org/linux-nfs/F738DB31-B527-4048-94A7-DBF00533F8C1@= redhat.com/#t > >=20 > > Problem is that clients can easily issue enough WRITEs that end up in > >=20 > > __break_lease > > xfs_break_leased_layouts > > ... > > nfsd_vfs_write > > ... > > svc_process > > svc_recv > > nfsd > >=20 > > .. so that all the knfsds are there, and nothing can process the > > LAYOUTRETURN. > >=20 > > I'm pretty sure we can make the linux client a bit smarter about it (I = saw > > one LAYOUTGET and one conflicting WRITE in the same TCP segment, in tha= t > > order). >=20 > Actually, I can't imagine any block/SCSI/NVMe server implementation that > would be fine with a client writing to the device at the same time the se= rver > does, and so why shouldn't the client preemptively return the layout? >=20 > Ben >=20 That may be, but I don't think we can rely on that from the server-side. I know that Neil and Chuck were discussing spinning up more nfsd threads dynamically as required. That may be the best fix for this sort of problem. Until then, the guidance should probably be to start a _lot_ of threads if you're running a pNFS SCSI enabled nfsd server. --=20 Jeff Layton