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[23.128.96.18]) by mx.google.com with ESMTP id a9si4494480edn.29.2021.08.04.20.59.22; Wed, 04 Aug 2021 20:59:51 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@raptorengineering.com header.s=B8E824E6-0BE2-11E6-931D-288C65937AAD header.b=inmYCdCf; spf=pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-nfs-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=raptorengineering.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234007AbhHEAEb (ORCPT + 99 others); Wed, 4 Aug 2021 20:04:31 -0400 Received: from mail.rptsys.com ([23.155.224.45]:27245 "EHLO mail.rptsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229991AbhHEAEb (ORCPT ); Wed, 4 Aug 2021 20:04:31 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.rptsys.com (Postfix) with ESMTP id C0D5137B2A7AFA for ; Wed, 4 Aug 2021 19:04:17 -0500 (CDT) Received: from mail.rptsys.com ([127.0.0.1]) by localhost (vali.starlink.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id uaqiag-U_SUI for ; Wed, 4 Aug 2021 19:04:16 -0500 (CDT) Received: from localhost (localhost [127.0.0.1]) by mail.rptsys.com (Postfix) with ESMTP id 3F47037B2A7AF6 for ; Wed, 4 Aug 2021 19:04:16 -0500 (CDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.rptsys.com 3F47037B2A7AF6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raptorengineering.com; s=B8E824E6-0BE2-11E6-931D-288C65937AAD; t=1628121856; bh=mTcmHV4HCbf5nFg8GpbOGPhqRUg+mbbK6mzQ8C0h6mg=; h=Date:From:To:Message-ID:MIME-Version; b=inmYCdCf50WwHBXH5oU7j3SLCGybu+bG5/0EYlXnmcPfsXdu2bW7kqoncc2W42bZJ bhsB1FlDkyPisQ4S/Koy8d9DysKgu99PBb/pQZhLIzDUxDjS2s+BSO7rV7JmEyeFo8 lU68o4WjLyOicp9znqzcBp/bc4TF+mrLrIydWplE= X-Virus-Scanned: amavisd-new at rptsys.com Received: from mail.rptsys.com ([127.0.0.1]) by localhost (vali.starlink.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id xnsqnshjfY7V for ; Wed, 4 Aug 2021 19:04:16 -0500 (CDT) Received: from vali.starlink.edu (unknown [192.168.3.2]) by mail.rptsys.com (Postfix) with ESMTP id 14D3A37B2A7AF3 for ; Wed, 4 Aug 2021 19:04:16 -0500 (CDT) Date: Wed, 4 Aug 2021 19:04:16 -0500 (CDT) From: Timothy Pearson To: linux-nfs Message-ID: <1851673341.49012.1628121856011.JavaMail.zimbra@raptorengineeringinc.com> In-Reply-To: <985631970.48634.1628121620017.JavaMail.zimbra@raptorengineeringinc.com> References: <985631970.48634.1628121620017.JavaMail.zimbra@raptorengineeringinc.com> Subject: Re: Callback slot table overflowed MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Mailer: Zimbra 8.5.0_GA_3042 (ZimbraWebClient - GC83 (Linux)/8.5.0_GA_3042) Thread-Topic: Callback slot table overflowed Thread-Index: pWASFVTGcuTitVsqm6vgvEReZrSGHqraViLp Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Other information that may be helpful: All clients are using TCP arm64 clients are unaffected by the bug The armel clients use very small (4k) rsize/wsize buffers Prior to the upgrade from Debian Stretch, everything was working perfectly ----- Original Message ----- > From: "Timothy Pearson" > To: "linux-nfs" > Sent: Wednesday, August 4, 2021 7:00:20 PM > Subject: Callback slot table overflowed > All, > > We've hit an odd issue after upgrading a main NFS server from Debian Stretch to > Debian Buster. In both cases the 5.13.4 kernel was used, however after the > upgrade none of our ARM thin clients can mount their root filesystems -- early > in the boot process I/O errors are returned immediately following "Callback > slot table overflowed" in the client dmesg. > > I am unable to find any useful information on this "Callback slot table > overflowed" message, and have no idea why it is only impacting our ARM (armel) > clients. Both 4.14 and 5.3 on the client side show the issue, other client > kernel versions were not tested. > > Curiously, increasing the rsize/wsize values to 65536 or higher reduces (but > does not eliminate) the number of callback overflow messages. > > The server is a ppc64el 64k page host, and none of our pcc64el or amd64 thin > clients are experiencing any problems. Nothing of interest appears in the > server message log. > > Any troubleshooting hints would be most welcome. > > Thank you!