From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 10 May 2002 11:31:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 10 May 2002 11:31:12 -0400 Received: from gw.chygwyn.com ([62.172.158.50]:28169 "EHLO gw.chygwyn.com") by vger.kernel.org with ESMTP id ; Fri, 10 May 2002 11:31:11 -0400 From: Steven Whitehouse Message-Id: <200205101511.QAA29742@gw.chygwyn.com> Subject: Re: Kernel deadlock using nbd over acenic driver. To: chen_xiangping@emc.com (chen, xiangping) Date: Fri, 10 May 2002 16:11:23 +0100 (BST) Cc: linux-kernel@vger.kernel.org In-Reply-To: from "chen, xiangping" at May 10, 2002 11:02:05 AM Organization: ChyGywn Limited X-RegisteredOffice: 7, New Yatt Road, Witney, Oxfordshire. OX28 1NU England X-RegisteredNumber: 03887683 Reply-To: Steve Whitehouse X-Mailer: ELM [version 2.5 PL1] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, > > Hi, > [deadlock conditions snipped] > > The nbd_client get stuck in sock_recvmsg, and one other process stucks > in do_nbd_request (sock_sendmsg). I will try to use kdb to give you > more foot print. > Anything extra you can send me like that will be very helpful. > The system was low in memory, I started up 20 to 40 thread to do block > write simultaneously. > Ok. I'll have to try and set something similar up because I've not seen any hangs with the latest nbd in 2.4 at all. Do you find that the hangs happen relatively quickly after you start the I/O or is it something which takes some time ? Steve.