Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262407AbTEEPt6 (ORCPT ); Mon, 5 May 2003 11:49:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262424AbTEEPt6 (ORCPT ); Mon, 5 May 2003 11:49:58 -0400 Received: from holomorphy.com ([66.224.33.161]:17025 "EHLO holomorphy") by vger.kernel.org with ESMTP id S262407AbTEEPt5 (ORCPT ); Mon, 5 May 2003 11:49:57 -0400 Date: Mon, 5 May 2003 09:02:22 -0700 From: William Lee Irwin III To: Linus Torvalds Cc: David van Hoose , Kernel Mailing List Subject: Re: Linux 2.5.69 Message-ID: <20030505160222.GP8931@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Linus Torvalds , David van Hoose , Kernel Mailing List References: <3EB602ED.3080207@cox.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1479 Lines: 28 On Mon, May 05, 2003 at 08:56:41AM -0700, Linus Torvalds wrote: > They actually started in 2.5.60 if it's the same bug. > And yes, you'd get random crashes, panics, lockups and even reboots. The > problem was that the pmd/pgd's were put in the slab cache in between > 2.5.59 and 2.5.60, and that was simply wrong because the AGP code changes > the cacheability of the kernel pages when it maps stuff into the AGP > aperture. That in turn will change the page tables but it won't update the > cached entries in the pmd slab caches. > So what happens is that once you exit X, and the page tables are put back > together without the cacheability changes, and you start a new program, > that program may get a page table with partly bogus kernel page table > entries. > That, in turn, when it happens will cause _major_ memory corruption, and > your machine is toast, often in very interesting ways because the internal > kernel data structures got corrupted. It can also cause random SIGSEGV's > etc. > But it only happens with AGP, and a lot of people either don't use it or > run only one X session. Any chance one of you could try out the fixed slabification patches? Message-ID: <20030505105213.GO8931@holomorphy.com> -- wli - 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/