From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3F63EC2B9F4 for ; Thu, 17 Jun 2021 12:36:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 16250610CA for ; Thu, 17 Jun 2021 12:36:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231207AbhFQMiI (ORCPT ); Thu, 17 Jun 2021 08:38:08 -0400 Received: from server.eikelenboom.it ([91.121.65.215]:40714 "EHLO server.eikelenboom.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230225AbhFQMiG (ORCPT ); Thu, 17 Jun 2021 08:38:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=eikelenboom.it; s=20180706; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Iq7qdsDsVjBjx3WrDBIM54QXGdH+Ntk8viW76NT5q2g=; b=fyKFlq8/vKowL8Pv4ceazD6cNR heZJUaVIV0RryDwRVVvuH4U4C5+XHvUi7E1r72BTz4J2xPWH+h3Pdc6VjRcA1ifK4CgYTUfG5WZat qSFHOqdeOYjYSbRUWw/T24bV7JecZTEVWTYpso6cztNwuMwKshaTKoPjmq5kvtjfhJ0Y=; Received: from 76-24-144-85.ftth.glasoperator.nl ([85.144.24.76]:51062 helo=[172.16.1.50]) by server.eikelenboom.it with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1ltrK1-0005dC-5w; Thu, 17 Jun 2021 14:40:37 +0200 Subject: Re: Linux 5.13-rc6 regression to 5.12.x: kernel OOM and panic during kernel boot in low memory Xen VM's (256MB assigned memory). To: Juergen Gross , linux-kernel Cc: "xen-devel@lists.xenproject.org" , Linus Torvalds References: <6bcd447e-fd49-0519-a59e-478f84e9120f@suse.com> From: Sander Eikelenboom Message-ID: <46c90fab-5928-d181-432f-228304a7e019@eikelenboom.it> Date: Thu, 17 Jun 2021 14:35:50 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <6bcd447e-fd49-0519-a59e-478f84e9120f@suse.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 17/06/2021 12:30, Juergen Gross wrote: > On 17.06.21 11:26, Sander Eikelenboom wrote: >> L.S., >> >> I just tried to upgrade and test the linux kernel going from the 5.12 >> kernel series to 5.13-rc6 on my homeserver with Xen, but ran in some >> trouble. >> >> Some VM's boot fine (with more than 256MB memory assigned), but the >> smaller (memory wise) PVH ones crash during kernel boot due to OOM. >> Booting VM's with 5.12(.9) kernel still works fine, also when dom0 is >> running 5.13-rc6 (but it has more memory assigned, so that is not >> unexpected). >> >> The 5.13-rc6'ish kernel is a pull of today, tried both with and without > >> last AKPM's patches, but that >> makes no difference. >> >> Below are stacktraces from a few of the crashing VM's. >> >> Attached is the kernel .config >> >> Any pointers ? > > Did you compare memory usage with a bootable guest between kernel 5.12 > and 5.13-rc6? > > Any chance you could bisect? > > > Juergen > Yeah a bisection is already underway, still 10 steps to go ... -- Sander