Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754289AbYGUQUy (ORCPT ); Mon, 21 Jul 2008 12:20:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753886AbYGUQUl (ORCPT ); Mon, 21 Jul 2008 12:20:41 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:57296 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753870AbYGUQUk (ORCPT ); Mon, 21 Jul 2008 12:20:40 -0400 Message-ID: <4884B724.40401@linux-foundation.org> Date: Mon, 21 Jul 2008 11:19:48 -0500 From: Christoph Lameter User-Agent: Thunderbird 2.0.0.14 (Windows/20080421) MIME-Version: 1.0 To: Vegard Nossum CC: Ingo Molnar , Evgeniy Polyakov , Pekka Enberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, "Rafael J. Wysocki" , davem@davemloft.net Subject: Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison overwritten References: <20080717214222.GA29449@elte.hu> <20080718091146.GQ6875@elte.hu> <20080721094110.GA16029@elte.hu> <84144f020807210252k68d5cf65i8c7ae3c11cecc046@mail.gmail.com> <20080721100627.GA5953@2ka.mipt.ru> <20080721105051.GA5830@elte.hu> <19f34abd0807210403n1bca348fn83773b55a08b7993@mail.gmail.com> In-Reply-To: <19f34abd0807210403n1bca348fn83773b55a08b7993@mail.gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1635 Lines: 40 Vegard Nossum wrote: > On Mon, Jul 21, 2008 at 12:50 PM, Ingo Molnar wrote: > >> the problem is, most of the crashes dont come with any usable dump. This >> is a laptop so netconsole is the only reliable route out - and if >> something in networking crashes chances are that it hoses netconsole >> before it can get anything out. >> >> Another thing is that i'm activating netconsole on this box via a kernel >> boot line and from within a bzImage (to get it activated as early as >> possible) - maybe that's a tad too early for certain initialization >> sequences? >> >> I could try run tests with netconsole deactivated, if you think that's a >> worthwile line of probing this problem. (although that would make me do >> blind tests in essence - having kernel log output is really essential.) >> > > How about posting your custom patches for public review? :-D > > (There was recently an odd case of kzalloc() succeeding even though it > was called before the slab caches were initialized -- and it only > generated a warning about irqs-on happening too early. I just mean to > say that it _can_ happen. On another machine, it crashed > spectacularly. I guess you're not enabling the netconsole before slab > allocator is up?) > > > Vegard > > Kzalloc for objects > 4k will succeed even during early boot since we will directly call into the page allocator. -- 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/