From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Jones Subject: Re: Kernel 3.0: Instant kernel crash when mounting CIFS Date: Mon, 15 Aug 2011 15:31:01 -0400 Message-ID: <20110815193101.GA7295@redhat.com> References: <20110815064734.403b630f@corrin.poochiereds.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jeff Layton , Jesper Juhl , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Alan Piszcz , Steve French , linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Justin Piszcz Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: On Mon, Aug 15, 2011 at 02:01:12PM -0400, Justin Piszcz wrote: > It crashed again with the patches, this time I got a picture: > http://home.comcast.net/~jpiszcz/20110815/26030-kernel-crash-when-cifs-mount.jpg > > The machine is up no issues until you try and mount a CIFS share, then > the problem occurs, every time (and with the patches as well). This looks like you oopsed in cache_alloc_refill, and then after that the watchdog kicked in, and spewed traces, scrolling the backtrace for the actual oops off the screen. Might be worth trying to reproduce it with CONFIG_LOCKUP_DETECTOR disabled. We frequently see this sort of thing reported in Fedora. It would be nice if we had a means of either reading scrollback when we lockup, or buffering the output so we pause between dumping traces. Dave From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752196Ab1HOTbX (ORCPT ); Mon, 15 Aug 2011 15:31:23 -0400 Received: from mx1.redhat.com ([209.132.183.28]:12716 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751287Ab1HOTbW (ORCPT ); Mon, 15 Aug 2011 15:31:22 -0400 Date: Mon, 15 Aug 2011 15:31:01 -0400 From: Dave Jones To: Justin Piszcz Cc: Jeff Layton , Jesper Juhl , linux-kernel@vger.kernel.org, Alan Piszcz , Steve French , linux-cifs@vger.kernel.org Subject: Re: Kernel 3.0: Instant kernel crash when mounting CIFS Message-ID: <20110815193101.GA7295@redhat.com> Mail-Followup-To: Dave Jones , Justin Piszcz , Jeff Layton , Jesper Juhl , linux-kernel@vger.kernel.org, Alan Piszcz , Steve French , linux-cifs@vger.kernel.org References: <20110815064734.403b630f@corrin.poochiereds.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 15, 2011 at 02:01:12PM -0400, Justin Piszcz wrote: > It crashed again with the patches, this time I got a picture: > http://home.comcast.net/~jpiszcz/20110815/26030-kernel-crash-when-cifs-mount.jpg > > The machine is up no issues until you try and mount a CIFS share, then > the problem occurs, every time (and with the patches as well). This looks like you oopsed in cache_alloc_refill, and then after that the watchdog kicked in, and spewed traces, scrolling the backtrace for the actual oops off the screen. Might be worth trying to reproduce it with CONFIG_LOCKUP_DETECTOR disabled. We frequently see this sort of thing reported in Fedora. It would be nice if we had a means of either reading scrollback when we lockup, or buffering the output so we pause between dumping traces. Dave