From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751737AbaCYAox (ORCPT ); Mon, 24 Mar 2014 20:44:53 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:47953 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751191AbaCYAow (ORCPT ); Mon, 24 Mar 2014 20:44:52 -0400 Message-ID: <5330D15E.2000702@oracle.com> Date: Mon, 24 Mar 2014 20:44:14 -0400 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Jan Kara CC: Al Viro , linux-fsdevel@vger.kernel.org, LKML , Linus Torvalds Subject: Re: fs: gpf in simple_setattr References: <52CD762B.7020600@oracle.com> <53123D81.6080003@oracle.com> <20140303214040.GA15265@quack.suse.cz> <53166920.709@oracle.com> <20140305124536.GA32371@quack.suse.cz> <53189BF8.1010308@oracle.com> <531A7CFD.9030603@oracle.com> <20140310104350.GB28797@quack.suse.cz> <531DC89A.9010601@oracle.com> <53304451.7030800@oracle.com> <20140324214851.GB10057@quack.suse.cz> In-Reply-To: <20140324214851.GB10057@quack.suse.cz> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: ucsinet21.oracle.com [156.151.31.93] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/24/2014 05:48 PM, Jan Kara wrote: >> >[ 339.948946] ** 4194304 ffff8805ac03ba38 [eventpoll] ffff8806ec051fe0 >> >[eventpoll] ffffffff84666040 ffff88056c73e7b0 (null) > OK, great. So finally we have something useful. We know we have problems > with [eventpoll] dentry. That is actually a special filesystem not mounted > anywhere - likely you get to that dentry through/proc//fd/. Now > eventpoll is interesting because it uses single anon inode for all > eventpoll instances. And that inode should stay in place as long as > eventpoll filesystem exists. So it's not clear how come that inode is > freed. The basic check of handling of inode use count didn't find anything > suspicious. But I can check in more detail and if I fail, we now have a > pretty narrow area where to look... Seems like it's not specific to eventpoll, I saw the same error message with "eventfd" and "perf_event". Thanks, Sasha