From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753424AbaGDRPs (ORCPT ); Fri, 4 Jul 2014 13:15:48 -0400 Received: from mail-qa0-f47.google.com ([209.85.216.47]:38418 "EHLO mail-qa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752350AbaGDRPr (ORCPT ); Fri, 4 Jul 2014 13:15:47 -0400 Date: Fri, 4 Jul 2014 13:15:44 -0400 From: Tejun Heo To: Sasha Levin Cc: Jens Axboe , LKML , Dave Jones Subject: Re: blk: NULL ptr deref in blk_throtl_drain Message-ID: <20140704171544.GB11787@mtj.dyndns.org> References: <53B6DA3E.40704@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <53B6DA3E.40704@oracle.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 04, 2014 at 12:45:50PM -0400, Sasha Levin wrote: > Hi all, > > While fuzzing with trinity inside a KVM tools guest running the latest -next > kernel I've stumbled on the following spew: > > [ 3660.610281] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 > [ 3660.612608] IP: blk_throtl_drain (block/blk-throttle.c:1639) This is a problem which can also happen before the patch with lower frequency. There was a fix proposed about a week ago which I suggested a different approach for. I'll dig up that thread and ping. Thanks. -- tejun