Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754717Ab0H3Igx (ORCPT ); Mon, 30 Aug 2010 04:36:53 -0400 Received: from hera.kernel.org ([140.211.167.34]:54229 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753528Ab0H3Igw (ORCPT ); Mon, 30 Aug 2010 04:36:52 -0400 Message-ID: <4C7B6C07.6010800@kernel.org> Date: Mon, 30 Aug 2010 10:29:59 +0200 From: Tejun Heo User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9.2.8) Gecko/20100802 Thunderbird/3.1.2 MIME-Version: 1.0 To: CAI Qian CC: kexec , linux-next@vger.kernel.org, torvalds@linux-foundation.org, linux-kernel Subject: Re: kdump regression compared to v2.6.35 References: <1888320510.1487031283139773505.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> In-Reply-To: <1888320510.1487031283139773505.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> X-Enigmail-Version: 1.1.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Mon, 30 Aug 2010 08:36:37 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 781 Lines: 23 Hello, On 08/30/2010 05:42 AM, CAI Qian wrote: >> Hmmm... I can't reproduce it here. I wonder what the difference is. >> Can you please trigger sysrq-t after the boot is hung and post the >> result? > Sysrq keys did not work at this early stage of booting for me even > adding sysrq_always_enabled. I see. I'll prepare a debug patch which tries to catch long execution delays in workqueue but in the meantime can you please turn on hangcheck timer and see whether it triggers after the kernel hangs during boot? Thanks. -- tejun -- 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/