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=DKIMWL_WL_HIGH,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 16673C2D0C0 for ; Mon, 9 Dec 2019 03:10:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E10C6206D3 for ; Mon, 9 Dec 2019 03:10:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575861045; bh=EB2YpaWu4xz71ABGteOELs6xI2WRD092KsDmrSaOY2w=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=wlE4SXgKGepiTkS91bZ1+3eQEjZOgrE+ZICCNtWdLAKzPVNPEn9GI3PSkSR33askf evncQERz/9JnIx0aIkv7dCI1GJo9osLVRkJvcF7SfjfaQXAk0TUbGaRMeNjks/3G9U byiMEunu9OWmnwSyImjPsysH5OEKlKCkIOkqce74= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726975AbfLIDKn (ORCPT ); Sun, 8 Dec 2019 22:10:43 -0500 Received: from mail-lj1-f196.google.com ([209.85.208.196]:45815 "EHLO mail-lj1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726823AbfLIDKn (ORCPT ); Sun, 8 Dec 2019 22:10:43 -0500 Received: by mail-lj1-f196.google.com with SMTP id d20so13816387ljc.12 for ; Sun, 08 Dec 2019 19:10:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=IsO7dZNBIbPprBYyThs91AYRzpngSHQwAmXmPwKBIg0=; b=MEH4ND4Nbsa4gl4HUUT5shBi2298BFMiOLZ4+lFC2yve4Ysbypny+1LndDWz1cqNTn 4oOqiljoOg+6px1pt4OX19oYw3KLSxMURevpnBdU9w0Twjw/NymP62DqGoJk504Xl2N3 6N3ACDfBvVDPRNdQ8p5o0tC5Mtx69DXAZkVXg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=IsO7dZNBIbPprBYyThs91AYRzpngSHQwAmXmPwKBIg0=; b=Dpmoa2EXbizENnicoVHo3VwzQKiJYVpK4q0BfrVUJwOxyoxgnyWfsWFB/fOBS5+KUM xIWK1rEMAfA/RoJBx8H2HLi6jk2YbeNEhlWYY/UvQlOMtSQSjhpqjPOT9XWt2PnQzDbO 61toqTCzniVoD1oSc47BdZxGZ4NZYTfj0+98p8fIGXpzME931Bn3XAypMz9qF3P9+5Hz oLH5kG6rVe8lzZd/crjJDWYcRjQi3rk5kqZnqe3F7ht+fX4nyVvrWqtPxecMfdV6BH8i QdpkzceembNBkDxScJHqqulqrQ0lUucrH2vPrK914vgDleYoq+D8hzL3R6EEu+BUgx4E 6KJw== X-Gm-Message-State: APjAAAUrU59IGXZ62k8KIzzryWSuUBZXrhZvyJWYG6VKQhWGpwlkKUF2 bipcIvi24aH3FJJ1z7F8je9lttJN3HI= X-Google-Smtp-Source: APXvYqzWknV0OGXuIjzd758A9iu76vrEO7rHBAJkmJV6lGQqgAyHCuibYvw36i8HYXGQ9ifRuwwxVA== X-Received: by 2002:a2e:9008:: with SMTP id h8mr15728064ljg.217.1575861041087; Sun, 08 Dec 2019 19:10:41 -0800 (PST) Received: from mail-lj1-f174.google.com (mail-lj1-f174.google.com. [209.85.208.174]) by smtp.gmail.com with ESMTPSA id h7sm10068760lfj.29.2019.12.08.19.10.40 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 08 Dec 2019 19:10:40 -0800 (PST) Received: by mail-lj1-f174.google.com with SMTP id c19so13802561lji.11 for ; Sun, 08 Dec 2019 19:10:40 -0800 (PST) X-Received: by 2002:a2e:99d0:: with SMTP id l16mr15611418ljj.1.1575861039824; Sun, 08 Dec 2019 19:10:39 -0800 (PST) MIME-Version: 1.0 References: <30808b0b-367a-266a-7ef4-de69c08e1319@internode.on.net> <09396dca-3643-9a4b-070a-e7db2a07235e@internode.on.net> <20191209025209.GA4203@ZenIV.linux.org.uk> In-Reply-To: <20191209025209.GA4203@ZenIV.linux.org.uk> From: Linus Torvalds Date: Sun, 8 Dec 2019 19:10:23 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: refcount_t: underflow; use-after-free with CIFS umount after scsi-misc commit ef2cc88e2a205b8a11a19e78db63a70d3728cdf5 To: Al Viro Cc: Arthur Marsh , SCSI development list , Linux Kernel Mailing List , CIFS , "James E.J. Bottomley" Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Dec 8, 2019 at 6:52 PM Al Viro wrote: > > FWIW, the thing that is IME absolutely incompatible with bisection > is CONFIG_GCC_PLUGIN_RANDSTRUCT. It can affect frequencies badly > enough, even in the cases when the bug isn't directly dependent > upon that thing. It will easily affect timing in major ways, yes. You're right that at least the CI bots might want to disable it for bisecting. Or force a particular seed for RANDSTRUCT - I seem to recall that there was some way to make it be at least repeatable for any particular structure. Linus