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=-7.2 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,URIBL_BLOCKED,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 4F24CC433E0 for ; Wed, 17 Feb 2021 08:29:46 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D1D7664E24 for ; Wed, 17 Feb 2021 08:29:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D1D7664E24 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.86167.161477 (Exim 4.92) (envelope-from ) id 1lCIDJ-0003Z5-2Z; Wed, 17 Feb 2021 08:29:37 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 86167.161477; Wed, 17 Feb 2021 08:29:37 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lCIDI-0003Yy-TL; Wed, 17 Feb 2021 08:29:36 +0000 Received: by outflank-mailman (input) for mailman id 86167; Wed, 17 Feb 2021 08:29:35 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lCIDH-0003Ym-1q for xen-devel@lists.xenproject.org; Wed, 17 Feb 2021 08:29:35 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 1794ed29-bcbf-42b5-9169-e1b1d8d2fd7a; Wed, 17 Feb 2021 08:29:34 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 23F34B030; Wed, 17 Feb 2021 08:29:33 +0000 (UTC) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 1794ed29-bcbf-42b5-9169-e1b1d8d2fd7a X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1613550573; 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=YtcTVMfz0A0mn83jtQfp1GPwlNrriqd5zAvGUY7Md4c=; b=Ivkovvrcn/ckMsf2Lakda5GTLQLqtFJZXQ477ye9DJAeUOPrEVrkWXqFVBM9qJKhGsUQVj 5Fe1q7pTsVS3Z6+QN9VLabMaU6lqQUO5hxuUxP2xxatPDv8VlMVGOqUC439mCu9K+IU/kN z7PteCa+aRASMHRBZHc9gxqwp9fi6no= To: Roman Shaposhnik Cc: Stefano Stabellini , Xen-devel , Jan Beulich , Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Wei Liu , George Dunlap References: <45b8ef4c-6d36-e91b-ca1a-a82eeca5aaf5@suse.com> From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= Subject: Re: Linux DomU freezes and dies under heavy memory shuffling Message-ID: <49344e8d-5518-68c6-a417-68522a915e72@suse.com> Date: Wed, 17 Feb 2021 09:29:32 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="VWsJdD0BxsHUO9CZsPG3eM17N61YKLn9M" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --VWsJdD0BxsHUO9CZsPG3eM17N61YKLn9M Content-Type: multipart/mixed; boundary="awxEAb2lYGwwf0Kkvb0N17bv6mC3HNApN"; protected-headers="v1" From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= To: Roman Shaposhnik Cc: Stefano Stabellini , Xen-devel , Jan Beulich , Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Wei Liu , George Dunlap Message-ID: <49344e8d-5518-68c6-a417-68522a915e72@suse.com> Subject: Re: Linux DomU freezes and dies under heavy memory shuffling References: <45b8ef4c-6d36-e91b-ca1a-a82eeca5aaf5@suse.com> In-Reply-To: --awxEAb2lYGwwf0Kkvb0N17bv6mC3HNApN Content-Type: multipart/mixed; boundary="------------AFE1857A4354CA1A2D1E08A5" Content-Language: en-US This is a multi-part message in MIME format. --------------AFE1857A4354CA1A2D1E08A5 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 17.02.21 09:12, Roman Shaposhnik wrote: > Hi J=C3=BCrgen, thanks for taking a look at this. A few comments below:= >=20 > On Tue, Feb 16, 2021 at 10:47 PM J=C3=BCrgen Gro=C3=9F wrote: >> >> On 16.02.21 21:34, Stefano Stabellini wrote: >>> + x86 maintainers >>> >>> It looks like the tlbflush is getting stuck? >> >> I have seen this case multiple times on customer systems now, but >> reproducing it reliably seems to be very hard. >=20 > It is reliably reproducible under my workload but it take a long time > (~3 days of the workload running in the lab). This is by far the best reproduction rate I have seen up to now. The next best reproducer seems to be a huge installation with several hundred hosts and thousands of VMs with about 1 crash each week. >=20 >> I suspected fifo events to be blamed, but just yesterday I've been >> informed of another case with fifo events disabled in the guest. >> >> One common pattern seems to be that up to now I have seen this effect >> only on systems with Intel Gold cpus. Can it be confirmed to be true >> in this case, too? >=20 > I am pretty sure mine isn't -- I can get you full CPU specs if that's u= seful. Just the output of "grep model /proc/cpuinfo" should be enough. >=20 >> In case anybody has a reproducer (either in a guest or dom0) with a >> setup where a diagnostic kernel can be used, I'd be _very_ interested!= >=20 > I can easily add things to Dom0 and DomU. Whether that will disrupt the= > experiment is, of course, another matter. Still please let me know what= > would be helpful to do. Is there a chance to switch to an upstream kernel in the guest? I'd like to add some diagnostic code to the kernel and creating the patches will be easier this way. 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