From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932136AbbHUGmT (ORCPT ); Fri, 21 Aug 2015 02:42:19 -0400 Received: from helcar.hengli.com.au ([209.40.204.226]:34291 "EHLO helcar.hengli.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753375AbbHUGmR (ORCPT ); Fri, 21 Aug 2015 02:42:17 -0400 Date: Fri, 21 Aug 2015 14:42:07 +0800 From: Herbert Xu To: kernel test robot Cc: lkp@01.org, LKML , "David S. Miller" , netdev@vger.kernel.org Subject: Re: [lkp] [rhashtable] 9d901bc0515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/ioremap.c:63 __ioremap_check_ram+0x6a/0x99() Message-ID: <20150821064207.GA5835@gondor.apana.org.au> References: <87fv3dkwgw.fsf@yhuang-dev.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87fv3dkwgw.fsf@yhuang-dev.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 On Fri, Aug 21, 2015 at 02:05:19PM +0800, kernel test robot wrote: > FYI, we noticed the below changes on > > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > commit 9d901bc05153bbf33b5da2cd6266865e531f0545 ("rhashtable: Free bucket tables asynchronously after rehash") > > With the commit, the possibility of OOM is increased under our boot testing. Can you gather some stats on how much memory rhashtable is actually using? With that kernel you've probably got only one rhashtable user which is netlink. Bear in mind that this is a fairly low-memory machine (< 300M) so it's not clear to me that this patch is the root cause of your OOM problem. Thanks, -- Email: Herbert Xu Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt