Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752534AbaFXWLx (ORCPT ); Tue, 24 Jun 2014 18:11:53 -0400 Received: from mail-qc0-f169.google.com ([209.85.216.169]:59144 "EHLO mail-qc0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750985AbaFXWLw (ORCPT ); Tue, 24 Jun 2014 18:11:52 -0400 Date: Tue, 24 Jun 2014 18:11:48 -0400 From: Tejun Heo To: Jet Chen Cc: Fengguang Wu , LKML , LKP Subject: Re: [block, blk] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 Message-ID: <20140624221148.GJ14909@htj.dyndns.org> References: <53A8F812.5050006@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <53A8F812.5050006@intel.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 Tue, Jun 24, 2014 at 12:01:22PM +0800, Jet Chen wrote: > Hi Tejun, > > we noticed the below changes on > > git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git review-mq-percpu_ref > commit c924ec35e72ce0d6c289b858d323f7eb3f5076a5 ("block, blk-mq: draining can't be skipped even if bypass_depth was non-zero") Yeah, this is from trying to drain NULL root blkcg. It's hit from another path too and will soon be fixed. Thanks! -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/