Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752950Ab0FDKQn (ORCPT ); Fri, 4 Jun 2010 06:16:43 -0400 Received: from one.firstfloor.org ([213.235.205.2]:45387 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751344Ab0FDKQm (ORCPT ); Fri, 4 Jun 2010 06:16:42 -0400 Date: Fri, 4 Jun 2010 12:16:39 +0200 From: Andi Kleen To: =?iso-8859-1?Q?Am=E9rico?= Wang Cc: Andi Kleen , Vitaly Mayatskikh , Vivek Goyal , linux-kernel@vger.kernel.org, Andrew Morton , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Randy Dunlap Subject: Re: [PATCH 0/5] kdump: extract log buffer and registers from vmcore on NMI button pressing Message-ID: <20100604101639.GB24794@basil.fritz.box> References: <1275464359-1566-1-git-send-email-v.mayatskih@gmail.com> <20100602151611.GA3174@redhat.com> <87iq60a3rh.wl%vmayatsk@redhat.com> <87d3w8xy3q.fsf@basil.nowhere.org> <874ohkuwhs.wl%vmayatsk@redhat.com> <20100603151347.GC4166@basil.fritz.box> <20100604094936.GA5975@cr0.nay.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20100604094936.GA5975@cr0.nay.redhat.com> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1013 Lines: 31 On Fri, Jun 04, 2010 at 05:49:36PM +0800, Am?rico Wang wrote: > On Thu, Jun 03, 2010 at 05:13:47PM +0200, Andi Kleen wrote: > >> > NMI would be only needed if the crash kernel is completely > >> > hosed too. > >> > >> That's the case. > > > >You're saying it booted but is hosed after boot? > > > >That seems like a very obscure case. Is that really common? > > > > Actually, I met two of this kind of cases recently. > > One was stucked in early_idt_hander() during booting the second kernel, Most likely screaming interrupt from some device. I have some ideas how to improve this by more forcefully resetting devices on kexec, but in general perhaps early idt needs to be hardened for this case too. -Andi -- ak@linux.intel.com -- Speaking for myself only. -- 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/