From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753962Ab2GPVxZ (ORCPT ); Mon, 16 Jul 2012 17:53:25 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37035 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752476Ab2GPVxX (ORCPT ); Mon, 16 Jul 2012 17:53:23 -0400 Date: Mon, 16 Jul 2012 17:53:18 -0400 From: Dave Jones To: Al Viro Cc: Linus Torvalds , Linux Kernel Subject: Re: 3.5-rc6 dentry related GPF Message-ID: <20120716215318.GA14629@redhat.com> Mail-Followup-To: Dave Jones , Al Viro , Linus Torvalds , Linux Kernel References: <20120711183239.GA7122@redhat.com> <20120716213218.GQ31729@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120716213218.GQ31729@ZenIV.linux.org.uk> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jul 16, 2012 at 10:32:18PM +0100, Al Viro wrote: > On Wed, Jul 11, 2012 at 12:10:12PM -0700, Linus Torvalds wrote: > > rdi = 54415541e5894855 > > > > which looks like some odd corrupted ASCII to me ("UH\211\345AUAT") but > > that makes no sense either. > > It makes a lot of sense as amd64 code, though: > > 55 push %rbp > 48 89 e5 mov %rsp,%rbp > 41 55 push %r13 > 41 54 push %r12 > > IOW, it's the first 8 bytes from a fairly sane beginning of some function. > So &(inode->i_fop->owner) (and thus inode->i_fop - owner is the first field) > is some spot in .text. Would be interesting to find out what function > was that from (i.e. what's the value of inode->i_fop); with any luck it > might've still been in some register. Could you post objdump of > do_dentry_open() from your kernel? I've done a few rebuilds since posting that, but hopefully things haven't moved around too much in that area recently.. http://fpaste.org/Pw5d/ is the whole open.o disassembly. Dave