From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751785AbcABLym (ORCPT ); Sat, 2 Jan 2016 06:54:42 -0500 Received: from mail-io0-f170.google.com ([209.85.223.170]:34994 "EHLO mail-io0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751335AbcABLyj (ORCPT ); Sat, 2 Jan 2016 06:54:39 -0500 Date: Sat, 2 Jan 2016 06:54:37 -0500 From: Tejun Heo To: Jeremiah Mahler , cgroups@vger.kernel.org, Serge Hallyn , Stephen Rothwell , linux-kernel@vger.kernel.org Subject: Re: cgroup: BUG: unable to handle kernel NULL pointer dereference Message-ID: <20160102115437.GE3660@htj.duckdns.org> References: <20160101234028.GA1750@hudson.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160101234028.GA1750@hudson.localdomain> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jan 01, 2016 at 03:40:28PM -0800, Jeremiah Mahler wrote: > all, > > When running the latest linux-next (20151231) two of my machines > hang early in the boot sequence. The initial message is for a > NULL pointer dereference. > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000030 > > And the RIP line refers to cgroup_path. > > RIP [] cgroup_path+0x30/0x80 > > Attached are pictures of the back trace. > > Let me know if I can do anything else to help. I will investigate the > problem further if I get a chance. This is most likely from the recent changes from cgroup ns support. Reverted the patchset for now as it also introduced a bisectability issue. Serge, can you please look into this one? Thanks. -- tejun