Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753070AbbDBD6V (ORCPT ); Wed, 1 Apr 2015 23:58:21 -0400 Received: from helcar.hengli.com.au ([209.40.204.226]:38349 "EHLO helcar.hengli.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752217AbbDBD6T (ORCPT ); Wed, 1 Apr 2015 23:58:19 -0400 Date: Thu, 2 Apr 2015 11:58:10 +0800 From: Herbert Xu To: Fengguang Wu Cc: LKP , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [rhashtable] [ INFO: suspicious RCU usage. ] Message-ID: <20150402035810.GA5408@gondor.apana.org.au> References: <20150402005211.GC12979@wfg-t540p.sh.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150402005211.GC12979@wfg-t540p.sh.intel.com> 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 Content-Length: 2110 Lines: 53 On Thu, Apr 02, 2015 at 08:52:11AM +0800, Fengguang Wu wrote: > Hi Herbert, > > 0day kernel testing robot got the below dmesg and the first bad commit is > > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > > commit ccd57b1bd32460d27bbb9c599e795628a3c66983 > Author: Herbert Xu > AuthorDate: Tue Mar 24 00:50:28 2015 +1100 > Commit: David S. Miller > CommitDate: Mon Mar 23 22:07:52 2015 -0400 > > rhashtable: Add immediate rehash during insertion > > This patch reintroduces immediate rehash during insertion. If > we find during insertion that the table is full or the chain > length exceeds a set limit (currently 16 but may be disabled > with insecure_elasticity) then we will force an immediate rehash. > The rehash will contain an expansion if the table utilisation > exceeds 75%. > > If this rehash fails then the insertion will fail. Otherwise the > insertion will be reattempted in the new hash table. > > Signed-off-by: Herbert Xu > Acked-by: Thomas Graf > Signed-off-by: David S. Miller > > [ 0.552992] Adding 2048 keys > [ 0.553792] > [ 0.554400] =============================== > [ 0.555285] [ INFO: suspicious RCU usage. ] > [ 0.556176] 4.0.0-rc4-01225-gccd57b1 #171 Not tainted > [ 0.557156] ------------------------------- > [ 0.558044] lib/rhashtable.c:400 suspicious rcu_dereference_check() usage! This should have been fixed by 58be8a583d8d316448bafa5926414cfb83c02dec. Can you check whether this commit was in your tested tree? Thanks, -- Email: Herbert Xu Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/