From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751125AbdE1LqO (ORCPT ); Sun, 28 May 2017 07:46:14 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:42471 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750979AbdE1LqN (ORCPT ); Sun, 28 May 2017 07:46:13 -0400 Subject: Re: mips qemu test failures in -next due to "kthread: Fix use-after-free if kthread fork fails" To: Guenter Roeck Cc: Oleg Nesterov , Jamie Iles , Thomas Gleixner , linux-kernel@vger.kernel.org References: <20170527175612.GA22714@roeck-us.net> From: Vegard Nossum Message-ID: Date: Sun, 28 May 2017 13:45:13 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 MIME-Version: 1.0 In-Reply-To: <20170527175612.GA22714@roeck-us.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/27/17 19:56, Guenter Roeck wrote: > Hi, > > my qemu testis of mips images are failing in -next. Symptom is a hang during > boot; see http://kerneltests.org/builders/qemu-mips-next for some examples. > > I bisected the problem in next-20170526. It points to commit 4d6501dce079c > ("kthread: Fix use-after-free if kthread fork fails"). Reverting that patch > fixes the problem. > > Bisect log is attached. Hi, Thanks for the report and sorry for the breakage :-/ I can't immediately spot what's going wrong, but I am able to reproduce it on mips so I will try to debug. Are you sure it's this commit, though? I checked out linus/master and I get a boot hang even after reverting it. Vegard