Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755754Ab1BNP1I (ORCPT ); Mon, 14 Feb 2011 10:27:08 -0500 Received: from smtp1.linux-foundation.org ([140.211.169.13]:49566 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754635Ab1BNP1F convert rfc822-to-8bit (ORCPT ); Mon, 14 Feb 2011 10:27:05 -0500 MIME-Version: 1.0 In-Reply-To: References: From: Linus Torvalds Date: Mon, 14 Feb 2011 07:26:13 -0800 Message-ID: Subject: Re: Heads up Linux 2.6.38-rc4 compile problems. To: "Eric W. Biederman" Cc: Alex Riesen , David Miller , Linux Kernel Mailing List , Andrew Morton Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1124 Lines: 29 On Sun, Feb 13, 2011 at 9:34 PM, Eric W. Biederman wrote: > > And for completeness. ?When I was rebooting v2.6.38-rc4 to start running > 795abaf1e4e188c4171e3cd3dbb11a9fcacaf505 ?I hit this. .. but this was while still running the older kernel, right? > <2>kernel BUG at mm/filemap.c:125! I suspect this is "normal" after page table corruption. Any page that was mapped but overwritten by the corruption would never get unmapped (since it can't be found in the page tables), and then you trigger the BUG_ON(page_mapped(page)); in __remove_from_page_cache() at umount time. Your register state shows that %eax is 0, and that's the count that we tested ("page->_mapcount" is -1 when there are no mappings, so you have one lost mapping reference to that page). So that oops isn't all that interesting, I'm afraid. Linus -- 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/