From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752712AbbIBHH2 (ORCPT ); Wed, 2 Sep 2015 03:07:28 -0400 Received: from mail-wi0-f173.google.com ([209.85.212.173]:32915 "EHLO mail-wi0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752483AbbIBHH0 (ORCPT ); Wed, 2 Sep 2015 03:07:26 -0400 Date: Wed, 2 Sep 2015 09:07:24 +0200 From: Thomas Graf To: Herbert Xu Cc: davem@davemloft.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, fengguang.wu@intel.com, wfg@linux.intel.com, lkp@01.org Subject: Re: [PATCH 2/3] rhashtable-test: retry insert operations in threads Message-ID: <20150902070724.GD11564@pox.localdomain> References: <20150901124648.GA27550@orbit.nwl.cc> <20150901130057.GA13230@gondor.apana.org.au> <20150901134310.GB27550@orbit.nwl.cc> <20150901135019.GA13629@gondor.apana.org.au> <20150901135618.GD27550@orbit.nwl.cc> <20150901140341.GA13757@gondor.apana.org.au> <20150901141305.GA11564@pox.localdomain> <20150901141639.GA13856@gondor.apana.org.au> <20150901145124.GC11564@pox.localdomain> <20150902020025.GA18184@gondor.apana.org.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150902020025.GA18184@gondor.apana.org.au> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/02/15 at 10:00am, Herbert Xu wrote: > On Tue, Sep 01, 2015 at 04:51:24PM +0200, Thomas Graf wrote: > > > > 1. The current in-kernel self-test > > 2. bind_netlink.c: https://github.com/tgraf/rhashtable > > Thanks, I will try to reproduce this. The path in question is: int rhashtable_insert_rehash(struct rhashtable *ht) { [...] old_tbl = rht_dereference_rcu(ht->tbl, ht); tbl = rhashtable_last_table(ht, old_tbl); size = tbl->size; if (rht_grow_above_75(ht, tbl)) size *= 2; /* Do not schedule more than one rehash */ else if (old_tbl != tbl) return -EBUSY; The behaviour in question is the immediate rehash during insertion which we want to fail. Commits: ccd57b1bd32460d27bbb9c599e795628a3c66983 a87b9ebf1709687ff213091d0fdb4254b1564803