From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1428102AbeCBNYZ (ORCPT ); Fri, 2 Mar 2018 08:24:25 -0500 Received: from lhrrgout.huawei.com ([194.213.3.17]:28173 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1425029AbeCBNYX (ORCPT ); Fri, 2 Mar 2018 08:24:23 -0500 Subject: Re: [Question PATCH 0/1] mm: crash in vmalloc_to_page - misuse or bug? To: CC: , , References: <20180222141324.5696-1-igor.stoppa@huawei.com> From: Igor Stoppa Message-ID: <921e8bb3-3c4d-be75-3029-35fde00087c7@huawei.com> Date: Fri, 2 Mar 2018 15:23:45 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180222141324.5696-1-igor.stoppa@huawei.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.122.225.51] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Ping? The kernel test automation seems to confirm my findings: https://marc.info/?l=linux-mm&m=151999308428656&w=2 Is this really a bug? On 22/02/18 16:13, Igor Stoppa wrote: > While trying to change the code of find_vm_area, I got an automated > notification that my code was breaking the testing of i386, based on the > 0-day testing automation from 01.org > > I started investigating the issue and noticed that it seems to be > reproducible also on top of plain 4.16-rc2, without any of my patches. > > I'm still not 100% sure that I'm doing something sane, but I thought it > might be good to share the finding. > > The patch contains both a minimal change, to trigger the crash, and a > snippet of the log of the crash i get. > > Igor Stoppa (1): > crash vmalloc_to_page() > > mm/vmalloc.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) -- igor