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=-1.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED autolearn=unavailable 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 F258AC43381 for ; Thu, 14 Feb 2019 20:50:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BF5452147C for ; Thu, 14 Feb 2019 20:50:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="NvmVXhXB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2503244AbfBNUuQ (ORCPT ); Thu, 14 Feb 2019 15:50:16 -0500 Received: from mail-it1-f195.google.com ([209.85.166.195]:38053 "EHLO mail-it1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2503209AbfBNUuP (ORCPT ); Thu, 14 Feb 2019 15:50:15 -0500 Received: by mail-it1-f195.google.com with SMTP id l66so7798660itg.3 for ; Thu, 14 Feb 2019 12:50:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=WvvgtO108VJAafNVgcU1w9YurHp/03az+8ivNdW3JSg=; b=NvmVXhXBpNpPBQgWL8YV4nbeZP02AfShQpx1zIyxh+F9p6wQjy05jKkAPtNhaoLuH7 H5q9ZDd7UY4KWCjbBsNR7Tt5Ix+RF+u4BWBodmtKMJ9jlHmib1LqW/ZtCAUv944xxVJb c107WiFNermdI6GhOR8gy4T3hvszRloeExIBquIM9+ZMGJL7G5jGIjs5VQeBJva2Ydr+ 30GUcBg1Yh3q1jMw5qMaZB5KsWfCgdZCKJO4Bt4a612ieUzUY0D3zxS1+tzbQqm/zuWD bVsCsoqE0+4yQ2rsPQSCw+eQkKt5u83P/h4lFre16OBvG8/8h+Ngh0LRUDLv52f4gt4w 0fEw== 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=WvvgtO108VJAafNVgcU1w9YurHp/03az+8ivNdW3JSg=; b=CAPhN/mv41XsMuxWM3Ze/zd+hfrxpfRGiTagf7v4NnSdB9W9ed3aV7n5DYRr3W2x3A HFFLQXyLzC3D7ECk7LGezXK0lFiIywx1KnlOEUGNn15OzZv86Xg87EVr/YIIuBYDe3Nh w26GaJoyXBcfZ4uuETLJAMj7DAYWpdnUWlZgtumrWjX3ZVlITzRqNPqyy2lploaSX5nA YDWr5UdfZP0CiFv+9j3P4s9lSeUKaLzFhKov8Px09fVnviYni8D3AJBN3hXeFyxvnnFr NcTr6YWIwailDLjWr9FICHy+9gvDtruNzfboDUwKu7u8Q2dBJj8E5BiJuGsUND6SbWzS cyEg== X-Gm-Message-State: AHQUAuZJiiD+UZEkaUd6Rx/2L7J+NXp5KTJ58c+KURLz2weeFZJSSn2P w4gublrw+qnKcCE4/mgd4qbTO9X6VnpBGQ== X-Google-Smtp-Source: AHgI3IZFZdPLh9nFsFMorfx1YpqKvUHnUP3JjKQZCPYQFrcRRXU0wjvylkOlrRppGS+yaI4QUj+Yvg== X-Received: by 2002:a24:a10:: with SMTP id 16mr3455673itw.42.1550177414296; Thu, 14 Feb 2019 12:50:14 -0800 (PST) Received: from [192.168.1.158] ([216.160.245.98]) by smtp.gmail.com with ESMTPSA id g186sm1607648ite.39.2019.02.14.12.50.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Feb 2019 12:50:13 -0800 (PST) Subject: Re: KASAN warning in bt_for_each To: Evan Green , Bart Van Assche Cc: linux-block , LKML References: <1550172827.93548.5.camel@acm.org> From: Jens Axboe Message-ID: Date: Thu, 14 Feb 2019 13:50:12 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/14/19 1:45 PM, Evan Green wrote: > On Thu, Feb 14, 2019 at 11:33 AM Bart Van Assche wrote: >> >> On Thu, 2019-02-14 at 10:04 -0800, Evan Green wrote: >>> Greetings, block experts! >>> >>> I'm trying to track down a KASAN warning I'm seeing in our downstream >>> 4.19 kernel, and I could use a little help. The warning looks like >>> this: >>> >>> [ 224.564894] BUG: KASAN: use-after-free in bt_for_each+0x1ac/0x28c >>> [ 224.571195] Read of size 8 at addr ffffffc17c621340 by task fio/3851 >>> [ 224.577745] >>> [ 224.579320] CPU: 2 PID: 3851 Comm: fio Tainted: G W 4.19.16 #398 >> >> Please have a look at this e-mail thread: >> https://lore.kernel.org/linux-block/1545261885.185366.488.camel@acm.org/ > > Oh, yep, that's totally it. Did that patch make it in anywhere? It didn't, since I didn't get any response to it. -- Jens Axboe