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=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 6B271C64E79 for ; Mon, 24 Dec 2018 22:39:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 39A0D21738 for ; Mon, 24 Dec 2018 22:39:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725848AbeLXWjr (ORCPT ); Mon, 24 Dec 2018 17:39:47 -0500 Received: from shards.monkeyblade.net ([23.128.96.9]:37640 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725788AbeLXWjr (ORCPT ); Mon, 24 Dec 2018 17:39:47 -0500 Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::cf9]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id EB48A100AF102; Mon, 24 Dec 2018 14:39:46 -0800 (PST) Date: Mon, 24 Dec 2018 14:39:46 -0800 (PST) Message-Id: <20181224.143946.1890079755062380899.davem@davemloft.net> To: clabbe.montjoie@gmail.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [BUG] net: sungem: device driver frees DMA memory with wrong function From: David Miller In-Reply-To: <20181223193821.GA24922@Red> References: <20181223193821.GA24922@Red> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Mon, 24 Dec 2018 14:39:47 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Corentin Labbe Date: Sun, 23 Dec 2018 20:38:21 +0100 > During a boot on a qemu machine, I hit the following problem: ... > After some pr_info, I found that the function triggering this is the pci_unmap_page() in gem_tx(). > So clearly this WARNING() is strange since it says "unmapped as single". I also went through the code paths and this makes no sense to me either.