From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from hera.kernel.org ([140.211.167.34]) by bombadil.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1Opzr5-00035h-Ge for kexec@lists.infradead.org; Mon, 30 Aug 2010 08:36:39 +0000 Message-ID: <4C7B6C07.6010800@kernel.org> Date: Mon, 30 Aug 2010 10:29:59 +0200 From: Tejun Heo MIME-Version: 1.0 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> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: CAI Qian Cc: torvalds@linux-foundation.org, linux-next@vger.kernel.org, kexec , linux-kernel 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 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: kdump regression compared to v2.6.35 Date: Mon, 30 Aug 2010 10:29:59 +0200 Message-ID: <4C7B6C07.6010800@kernel.org> References: <1888320510.1487031283139773505.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1888320510.1487031283139773505.JavaMail.root-k5qu2F3t005+R5eDjrG6zsCp5Q1pQRjfhaY/URYTgi6ny3qCrzbmXA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kexec-bounces-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Errors-To: kexec-bounces+glkk-kexec=m.gmane.org-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org To: CAI Qian Cc: torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, linux-next-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kexec , linux-kernel List-Id: linux-next.vger.kernel.org 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 From mboxrd@z Thu Jan 1 00:00:00 1970 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 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