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=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 AFE20C2BA2B for ; Wed, 8 Apr 2020 21:29:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 730A4206C0 for ; Wed, 8 Apr 2020 21:29:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lca.pw header.i=@lca.pw header.b="BWwwyhWd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730335AbgDHV3V (ORCPT ); Wed, 8 Apr 2020 17:29:21 -0400 Received: from mail-qv1-f65.google.com ([209.85.219.65]:38727 "EHLO mail-qv1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729692AbgDHV3U (ORCPT ); Wed, 8 Apr 2020 17:29:20 -0400 Received: by mail-qv1-f65.google.com with SMTP id p60so4492828qva.5 for ; Wed, 08 Apr 2020 14:29:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lca.pw; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=SVDtsGi6neGFRwikvRHYLrFbo8bPwU6BhE0B4MocRjo=; b=BWwwyhWdP4bCAjyoQRTv8OV8mtlXVPHwPlIm8qddLZj7iC674KnBH0wZ5gmU6DqS70 C1/zjPys7SA2QSBdBBh/Vp7z8tP4MoDCZ3J7yPaCEb3aWrDPLZrEzEc/s5uDb6B3B/Zz Q/D2iUPkb1UdcJAn2P997ms7im6hGVN1AKeVtc8UTksahOiOgwZP7W4x2aRAkYxmqdzU iRMjGNH23UhxVno00at7cV4XSlx7ataddhOqFfxmG3KosI9iQ69ciGaSMtVokdO2MFwz mouuM4fw0+U2UEJVYG186lPlYQdy+/QTmGdmwSkRbzlnh2r3DVGyLygwJLFIOmeGB5Hs PMWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=SVDtsGi6neGFRwikvRHYLrFbo8bPwU6BhE0B4MocRjo=; b=DTQHALBGrSGDMShF6h9QCv63eSzfJVnAbXV8BZ/b4XDNZcsW/SQZkEDAMf1sZUWwv6 bJRQjkLkQDUgstDZDAaLW5ab5elOntmaK6dtmswHUkFcnpctBncWqOb0vXJP033Mf/4s 5IpqaGtDDikkJS1tuWniC0p82XeMfoFANnoLed7PircBTdNPlSr8Yq/EHilGqrId7cc5 UqrwwJ0yVIOHRvZKqI+y2WNGh0elB+bKhdPX2zJxSPT/S6H4v21ET1hD+kSNXKuhM3gQ 9KcZObHw+VIbmLy6pfbWHi98tF7INg9NpeGL8zVo7hGGxV8uvQ6zEuHQWLWgFhE3yIPd EdGw== X-Gm-Message-State: AGi0PuaHBamJHXUNEluyYmDoOzd+uHIEtwoyov2+6IJ6jIQF/t79eGDk PwnNEbSRAYHxMo6HIcZGFXB++w== X-Google-Smtp-Source: APiQypIAPF83IDbnxE4npOa8BA/v00NSOs87AvIVV9hoWH5sYbQDJUSaLOrsAy9lYhzUtsirbdBiqw== X-Received: by 2002:a05:6214:b21:: with SMTP id w1mr9649854qvj.69.1586381359791; Wed, 08 Apr 2020 14:29:19 -0700 (PDT) Received: from [192.168.1.153] (pool-71-184-117-43.bstnma.fios.verizon.net. [71.184.117.43]) by smtp.gmail.com with ESMTPSA id i13sm12975162qtj.37.2020.04.08.14.29.18 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 08 Apr 2020 14:29:18 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Subject: Re: KCSAN + KVM = host reset From: Qian Cai In-Reply-To: Date: Wed, 8 Apr 2020 17:29:18 -0400 Cc: Elver Marco , "paul E. McKenney" , kasan-dev , LKML , kvm@vger.kernel.org Content-Transfer-Encoding: quoted-printable Message-Id: <017E692B-4791-46AD-B9ED-25B887ECB56B@lca.pw> References: To: Paolo Bonzini X-Mailer: Apple Mail (2.3608.80.23.2.2) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Apr 8, 2020, at 5:25 PM, Paolo Bonzini wrote: >=20 > 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=E2=80=9D before = running qemu-kvm). >=20 > 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). I don=E2=80=99t remember I had tried this combination before, so don=E2=80= =99t know if it is a regression or not.=