From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161162AbXD1WGg (ORCPT ); Sat, 28 Apr 2007 18:06:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161205AbXD1WGg (ORCPT ); Sat, 28 Apr 2007 18:06:36 -0400 Received: from extu-mxob-2.symantec.com ([216.10.194.135]:32138 "EHLO extu-mxob-2.symantec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161162AbXD1WGf (ORCPT ); Sat, 28 Apr 2007 18:06:35 -0400 Date: Sat, 28 Apr 2007 23:06:21 +0100 (BST) From: Hugh Dickins X-X-Sender: hugh@blonde.wat.veritas.com To: Andrew Morton cc: Tilman Schmidt , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Nick Piggin Subject: Re: 2.6.21-rc7-mm2 crash: Eeek! page_mapcount(page) went negative! (-1) In-Reply-To: <20070428141024.887342bd.akpm@linux-foundation.org> Message-ID: References: <20070425225716.8e9b28ca.akpm@linux-foundation.org> <46338AEB.2070109@imap.cc> <20070428141024.887342bd.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-OriginalArrivalTime: 28 Apr 2007 22:06:33.0893 (UTC) FILETIME=[7BACFD50:01C789E1] X-Brightmail-Verdict: VlJEQwAAAAIAAAABAAAAAAAAAAEAAAAAAAAABWluYm94AGxpbnV4LWtlcm5lbEB2Z2VyLmtlcm5lbC5vcmcAYWtwbUBsaW51eC1mb3VuZGF0aW9uLm9yZwBsaW51eC1tbUBrdmFjay5vcmcAdGlsbWFuQGltYXAuY2MAbmlja3BpZ2dpbkB5YWhvby5jb20uYXUA X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 28 Apr 2007, Andrew Morton wrote: > > It seems wildly screwed up that we have a PageReserved() page with a pfn of > zero (!) which claims to be in a reiserfs mapping, only it isn't attached > to a reiserfs file. How the heck did that happen? It's "simply" that it somehow got a spurious page table entry 00000001. Great that it's so reproducible, I take that to mean this one is not bad RAM. Your request for a bisection is just what we want, thanks. Hugh