Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751703AbcDRCIl (ORCPT ); Sun, 17 Apr 2016 22:08:41 -0400 Received: from mga14.intel.com ([192.55.52.115]:53887 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751441AbcDRCIk (ORCPT ); Sun, 17 Apr 2016 22:08:40 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,500,1455004800"; d="scan'208";a="947178606" From: "Huang\, Ying" To: Al Viro Cc: , LKML Subject: Re: [LKP] [lkp] [parallel lookups machinery, part 2] 96352435af: kernel BUG at mm/slab.c:2599! References: <87k2jvg1yc.fsf@yhuang-dev.intel.com> <20160418015521.GZ25498@ZenIV.linux.org.uk> Date: Mon, 18 Apr 2016 10:08:37 +0800 In-Reply-To: <20160418015521.GZ25498@ZenIV.linux.org.uk> (Al Viro's message of "Mon, 18 Apr 2016 02:55:21 +0100") Message-ID: <87mvorvfbu.fsf@yhuang-dev.intel.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 891 Lines: 23 Al Viro writes: > On Mon, Apr 18, 2016 at 09:06:35AM +0800, kernel test robot wrote: >> FYI, we noticed the below changes on >> >> https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git testing.lookups >> commit 96352435afd792d713ec91e2d5693bdcf40a6b03 ("parallel lookups machinery, part 2") > > Very odd. All stores in that commit are to ->d_parent->d_inode->i_dir_seq > of in-lookup dentries. And if ->d_parent in those gets buggered, we were > really deep in trouble. Could you try to reproduce that without __d_move() > or __d_add() parts and see which one ends up triggering that crap? Could you provide a debug branch in your tree for that? Best Regards, Huang, Ying > Note that we don't *use* ->i_dir_seq yet... > _______________________________________________ > LKP mailing list > LKP@lists.01.org > https://lists.01.org/mailman/listinfo/lkp