From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751740AbeDVNop (ORCPT ); Sun, 22 Apr 2018 09:44:45 -0400 Received: from mx2.suse.de ([195.135.220.15]:54871 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751163AbeDVNoo (ORCPT ); Sun, 22 Apr 2018 09:44:44 -0400 Date: Sun, 22 Apr 2018 07:44:39 -0600 From: Michal Hocko To: "Kirill A. Shutemov" Cc: Fengguang Wu , Alexander Shishkin , linux-kernel@vger.kernel.org, lkp@01.org Subject: Re: [dummy_stm_init] swapper/0: page allocation failure: order:9, mode:0x14040c0(GFP_KERNEL|__GFP_COMP), nodemask=(null) Message-ID: <20180422134439.GK17484@dhcp22.suse.cz> References: <20180419023639.cddsueaq47mohfma@wfg-t540p.sh.intel.com> <20180419065111.GM17484@dhcp22.suse.cz> <20180419102114.irntfpy6i77apfq5@node.shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180419102114.irntfpy6i77apfq5@node.shutemov.name> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu 19-04-18 13:21:14, Kirill A. Shutemov wrote: > On Thu, Apr 19, 2018 at 08:51:11AM +0200, Michal Hocko wrote: > > On Thu 19-04-18 10:36:39, Wu Fengguang wrote: > > > Hi Alexander, > > > > > > FYI this happens in mainline kernel 4.17.0-rc1. > > > It dates back to at least v4.15. > > > > > > It occurs in 4 out of 4 boots. Here KVM has 1G memory. > > > > > > This high order allocation caused lots of noises in our boot testing. > > > We could disable this device in our tests, but it would be great if > > > there are better ways out. > > > > > > [ 75.039408] Product name: fake-design-for-testing > > > [ 75.040995] fmc fake-design-for-testing-f001: Driver has no ID: matches all > > > [ 75.042509] fmc_trivial: probe of fake-design-for-testing-f001 failed with error -95 > > > [ 75.044323] fmc fake-design-for-testing-f001: Driver has no ID: matches all > > > [ 75.045644] fmc_chardev fake-design-for-testing-f001: Created misc device "fake-design-for-testing-f001" > > > [ 75.061570] swapper/0: page allocation failure: order:9, mode:0x14040c0(GFP_KERNEL|__GFP_COMP), nodemask=(null) > > > > Is there any reason why > > > [ 75.063338] stm_register_device+0xf3/0x5c0: > > > stm_register_device at drivers/hwtracing/stm/core.c:695 > > > > cannot use kvzalloc? > > Michal, do you understand how allocating ~512kB leads to order-9 failure? > Shouldn't it be order-8 at most? That's not clear to me. How do you tell it is 512kB? The page allocator consumes order so maybe something miscalculated the order when calling the allocator? -- Michal Hocko SUSE Labs