Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750941AbWJLMVa (ORCPT ); Thu, 12 Oct 2006 08:21:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750962AbWJLMVa (ORCPT ); Thu, 12 Oct 2006 08:21:30 -0400 Received: from embla.aitel.hist.no ([158.38.50.22]:4323 "HELO embla.aitel.hist.no") by vger.kernel.org with SMTP id S1750935AbWJLMV3 (ORCPT ); Thu, 12 Oct 2006 08:21:29 -0400 Message-ID: <452E327C.9020707@aitel.hist.no> Date: Thu, 12 Oct 2006 14:18:04 +0200 From: Helge Hafting User-Agent: Thunderbird 1.5.0.7 (X11/20060915) MIME-Version: 1.0 To: Andrew Morton CC: linux-kernel@vger.kernel.org Subject: Re: 2.6.19-rc1-mm1 - locks when using "dd bs=1M" from card reader References: <20061010000928.9d2d519a.akpm@osdl.org> In-Reply-To: <20061010000928.9d2d519a.akpm@osdl.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 758 Lines: 21 I found an easy way to hang the kernel when copying a SD-card: dd if=/dev/sdc of=file bs=1048576 I.e. copy the entire 256MB card in 1MB chunks. I got about 160MB before the kernel hung. Not even sysrq+B worked, I needed the reset button. The pc has a total of 512MB memory if that matters. Using bs=4096 instead let me copy the entire card with no problems, but that seems to progress slower. The above 'dd' command hangs my office pc every time. So I can repeat it for debugging purposes. Helge Hafting - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/