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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, 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 D6CACC2D0F4 for ; Wed, 8 Apr 2020 21:25:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 95C85206A1 for ; Wed, 8 Apr 2020 21:25:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZoXf2i3f" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729279AbgDHVZx (ORCPT ); Wed, 8 Apr 2020 17:25:53 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:41795 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728187AbgDHVZw (ORCPT ); Wed, 8 Apr 2020 17:25:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1586381151; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UJBpmrLVUaj5bFLbNbY74eKb6lWRZxALhzam3N9grC8=; b=ZoXf2i3fP1ci9z4jzb2lv1oi33tvwPOImsAWKFa+622VF2T/VlywwTsHIxB+EmMaVDSFMI gCrf9r4qDK5xWoPVPEYED3mH4yI8dHVGag3fA1io2P0szhabBACPkkMVxXH4fm9jPs7lgD 1IZXJHn4muj+aXtinRdyYGrKA4Rjocw= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-460-Gk-jcBdRPgebs1cFiDOgZA-1; Wed, 08 Apr 2020 17:25:49 -0400 X-MC-Unique: Gk-jcBdRPgebs1cFiDOgZA-1 Received: by mail-wm1-f72.google.com with SMTP id s9so1104730wmh.2 for ; Wed, 08 Apr 2020 14:25:49 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=UJBpmrLVUaj5bFLbNbY74eKb6lWRZxALhzam3N9grC8=; b=MGCFt8o4BkvEpCrGnJE8xGii7x4vtvgAgJ/8zguX73oC6lAc17KqWNay0tclI6n8C/ EOiZ0z9wniRBRjHCmuPvWhRKJ5t/PmoF4QswUJs8Pus9Is2vXJGNMSwG3mrcZ3mC/Nch t+SPQMoNrAFFsoSff6ALDUvI4fousnzaKX1ZCynbnTOx9N8uR+YHrQBCHGkzRUNQlkes 6YklaZV6/9xIWAmlSXB38dsmrWjzcQ4JaBgtfZWe7266XGzwWlIU2Sqv0o2v92MSecyb j1OUldTAVHjthxZte8RyDYpFATSDAWScwf3uud6+Dapg8Qf1vBPIdPiO/iY3hpgQvRi6 IjYA== X-Gm-Message-State: AGi0PuY65tNYEE6P4iaKrAVCBxZtYiXZnGSBi8c6ZOgRwFvnRgqlMV44 N+IB+2IFsRkan1A+LnajjVHVe2Ani4OwJaWf+/Y4xToWss2HV0eaxncoGQ1heJia1xs70WPMUhp UV2JqDLfelBWpInyvq8nroba7 X-Received: by 2002:a1c:2705:: with SMTP id n5mr6375968wmn.94.1586381148142; Wed, 08 Apr 2020 14:25:48 -0700 (PDT) X-Google-Smtp-Source: APiQypIEypWtp8IszcU/gyunBrcO7Rg/owcCayhmUqap5hxAkVPpXeNBGcvzCuxiSUBSePrEqghURw== X-Received: by 2002:a1c:2705:: with SMTP id n5mr6375955wmn.94.1586381147897; Wed, 08 Apr 2020 14:25:47 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:9c71:ae6b:ee1c:2d9e? ([2001:b07:6468:f312:9c71:ae6b:ee1c:2d9e]) by smtp.gmail.com with ESMTPSA id t17sm32671085wrv.53.2020.04.08.14.25.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Apr 2020 14:25:47 -0700 (PDT) Subject: Re: KCSAN + KVM = host reset To: Qian Cai , Elver Marco Cc: "paul E. McKenney" , kasan-dev , LKML , kvm@vger.kernel.org References: From: Paolo Bonzini Message-ID: Date: Wed, 8 Apr 2020 23:25:45 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/04/20 22:59, Qian Cai wrote: > Running a simple thing on this AMD host would trigger a reset right away. > Unselect KCSAN kconfig makes everything work fine (the host would also > reset If only "echo off > /sys/kernel/debug/kcsan” before running qemu-kvm). Is this a regression or something you've just started to play with? (If anything, the assembly language conversion of the AMD world switch that is in linux-next could have reduced the likelihood of such a failure, not increased it). Paolo