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=-7.5 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 043B0C2B9F4 for ; Thu, 17 Jun 2021 10:30:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D1F9F610A1 for ; Thu, 17 Jun 2021 10:30:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231496AbhFQKcy (ORCPT ); Thu, 17 Jun 2021 06:32:54 -0400 Received: from smtp-out1.suse.de ([195.135.220.28]:39274 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229716AbhFQKcu (ORCPT ); Thu, 17 Jun 2021 06:32:50 -0400 Received: from imap.suse.de (imap-alt.suse-dmz.suse.de [192.168.254.47]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 43EA121B07; Thu, 17 Jun 2021 10:30:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1623925841; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=APrhnlbR6CPajc97zKcQcAIuVfRUr6SkhcSylryamRA=; b=WdKGZ/zZavFYbJ3yRBWYM8m+C0Yxu0X3sZawTKA/saRhf2LlUYFkW4/YYcFyFHuBlJ5zhI PDDL6K72W8BgtpNM6iJmkjM9HjsTZQ0OWeLDD42yrmXj02ztQXwamvcgyL3GS64PRsuam9 hSrj7/y52jzX3HeBp7OsX3OmLPDrfws= Received: from imap3-int (imap-alt.suse-dmz.suse.de [192.168.254.47]) by imap.suse.de (Postfix) with ESMTP id 17BC1118DD; Thu, 17 Jun 2021 10:30:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1623925841; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=APrhnlbR6CPajc97zKcQcAIuVfRUr6SkhcSylryamRA=; b=WdKGZ/zZavFYbJ3yRBWYM8m+C0Yxu0X3sZawTKA/saRhf2LlUYFkW4/YYcFyFHuBlJ5zhI PDDL6K72W8BgtpNM6iJmkjM9HjsTZQ0OWeLDD42yrmXj02ztQXwamvcgyL3GS64PRsuam9 hSrj7/y52jzX3HeBp7OsX3OmLPDrfws= Received: from director2.suse.de ([192.168.254.72]) by imap3-int with ESMTPSA id yAmWBFEky2ByZQAALh3uQQ (envelope-from ); Thu, 17 Jun 2021 10:30:41 +0000 To: Sander Eikelenboom , linux-kernel Cc: "xen-devel@lists.xenproject.org" , Linus Torvalds References: From: Juergen Gross 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). Message-ID: <6bcd447e-fd49-0519-a59e-478f84e9120f@suse.com> Date: Thu, 17 Jun 2021 12:30:40 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Tc8GhS0WamFES6vdNMQyDXzLS0xnkwFuC" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --Tc8GhS0WamFES6vdNMQyDXzLS0xnkwFuC Content-Type: multipart/mixed; boundary="oMJ6vYp76QKfRvdShaqUSUociYnrR3bDR"; protected-headers="v1" From: Juergen Gross To: Sander Eikelenboom , linux-kernel Cc: "xen-devel@lists.xenproject.org" , Linus Torvalds Message-ID: <6bcd447e-fd49-0519-a59e-478f84e9120f@suse.com> 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). References: In-Reply-To: --oMJ6vYp76QKfRvdShaqUSUociYnrR3bDR Content-Type: multipart/mixed; boundary="------------DDDAFBAD2DD8943AE90EF9C4" Content-Language: en-US This is a multi-part message in MIME format. --------------DDDAFBAD2DD8943AE90EF9C4 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 17.06.21 11:26, Sander Eikelenboom wrote: > L.S., >=20 > I just tried to upgrade and test the linux kernel going from the 5.12=20 > kernel series to 5.13-rc6 on my homeserver with Xen, but ran in some=20 > trouble. >=20 > Some VM's boot fine (with more than 256MB memory assigned), but the=20 > 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=20 > running 5.13-rc6 (but it has more memory assigned, so that is not=20 > unexpected). >=20 > The 5.13-rc6'ish kernel is a pull of today, tried both with and without=20 > last AKPM's patches, but that > makes no difference. >=20 > Below are stacktraces from a few of the crashing VM's. >=20 > Attached is the kernel .config >=20 > Any pointers ? Did you compare memory usage with a bootable guest between kernel 5.12 and 5.13-rc6? Any chance you could bisect? 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