From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752288AbaJKXmR (ORCPT ); Sat, 11 Oct 2014 19:42:17 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:32283 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751224AbaJKXmQ (ORCPT ); Sat, 11 Oct 2014 19:42:16 -0400 Message-ID: <5439C035.8020208@oracle.com> Date: Sat, 11 Oct 2014 19:41:41 -0400 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 MIME-Version: 1.0 To: Thomas Graf CC: paulmck@linux.vnet.ibm.com, "David S. Miller" , LKML Subject: Re: rhashtable: hang while running tests on boot References: <5437E1B3.6020409@oracle.com> <20141010142247.GU4880@linux.vnet.ibm.com> <5437ED21.2040500@oracle.com> <20141011155032.GZ4880@linux.vnet.ibm.com> <5439564E.8080105@oracle.com> <20141011222615.GB14186@casper.infradead.org> In-Reply-To: <20141011222615.GB14186@casper.infradead.org> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/11/2014 06:26 PM, Thomas Graf wrote: > On 10/11/14 at 12:09pm, Sasha Levin wrote: >> On 10/11/2014 11:50 AM, Paul E. McKenney wrote: >>>>>>> I am guessing that this happens only when running the resizable hashtable >>>>>>> tests -- if that guess is incorrect, please let me know. >>>>> >>>>> I've seen it a few times only with rhashtable related traces, if that ever >>>>> changes I'll update - but for now I think it's safe to assume it's rhashtable >>>>> specific. >>> Ah, so this is intermittent. Joy. >> >> Yup, I'm seeing it in about 10% of boot attempts. > > Have you ever seen any traces outside of the test_rht code? I'm > trying to figure out whether it's a bug in the test code or in the > hash table itself. There are odd RCU lockups (one of which is pasted earlier in this thread), but there's nothing pointing to rht code there, and I'm not seeing any other rht related issues. Thanks, Sasha