Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758530AbYGULEQ (ORCPT ); Mon, 21 Jul 2008 07:04:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756634AbYGULD4 (ORCPT ); Mon, 21 Jul 2008 07:03:56 -0400 Received: from py-out-1112.google.com ([64.233.166.183]:30534 "EHLO py-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755790AbYGULDy (ORCPT ); Mon, 21 Jul 2008 07:03:54 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=GWhOjqNM4Q8ki2p3K2HXy40/8lb8QZvuAwee7NEsF4/lWFObHdSTzneM9oE0m3dywh 80dUVuY2VGWNCSLEb8h7yemEt1jutdkVh5bPQp9IEvH3I4qDNeM1JLa0O1v3Kz/JM3tR 7CRHPNh/FMdlXWdepuKME20zjEHWBZf05U7Cg= Message-ID: <19f34abd0807210403n1bca348fn83773b55a08b7993@mail.gmail.com> Date: Mon, 21 Jul 2008 13:03:50 +0200 From: "Vegard Nossum" To: "Ingo Molnar" Subject: Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison overwritten Cc: "Evgeniy Polyakov" , "Pekka Enberg" , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, "Rafael J. Wysocki" , cl@linux-foundation.org, davem@davemloft.net In-Reply-To: <20080721105051.GA5830@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline 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> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1669 Lines: 37 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 -- "The animistic metaphor of the bug that maliciously sneaked in while the programmer was not looking is intellectually dishonest as it disguises that the error is the programmer's own creation." -- E. W. Dijkstra, EWD1036 -- 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/