From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759206AbdAICZX (ORCPT ); Sun, 8 Jan 2017 21:25:23 -0500 Received: from shells.gnugeneration.com ([66.240.222.126]:34424 "HELO shells.gnugeneration.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754590AbdAICZW (ORCPT ); Sun, 8 Jan 2017 21:25:22 -0500 Date: Sun, 8 Jan 2017 20:25:21 -0600 From: lkml@pengaru.com To: Larry Finger Cc: linux-kernel@vger.kernel.org Subject: Re: BUG: 4.10 rtlwifi regression - NULL pointer dereference Message-ID: <20170109022521.GA9125@shells.gnugeneration.com> References: <20170109014150.GD4623@shells.gnugeneration.com> <32f982bb-a437-1f40-5306-1069ee8311f9@lwfinger.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <32f982bb-a437-1f40-5306-1069ee8311f9@lwfinger.net> User-Agent: Mutt/1.7.0 (2016-08-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Jan 08, 2017 at 08:03:18PM -0600, Larry Finger wrote: > On 01/08/2017 07:41 PM, lkml@pengaru.com wrote: > > Hello list, > > > > Gave 4.10-rc2 a shot today using the attached config. The kernel panics > > with a NULL pointer dereference upon starting dhclient after > > wpa_supplicant. > > > > The network device is a USB dongle: > > Bus 002 Device 002: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS] > > > > Reverting 'ba9f93f rtlwifi: Fix enter/exit power_save' prevents the > > crash. > > > > Sorry I don't have a verbatim capture of the panic, but I was able to > > catch the relevant parts and rtl_lps_leave() is dereferencing a NULL hw, > > below setup_arp_tx() and rtl_is_special_data(). That's what led me to > > reverting ba9f93f since it clearly plays with that stuff. > > > > FWIW machine is a plain X61s thinkpad, 1.8Ghz. > > > > You need the patch from > http://marc.info/?l=linux-wireless&m=148234081512703&w=2. It was pushed with > the notation that it needed to be included in 4.10; however, it has not yet > percolated through the system. > Thanks for the quick response Larry, on a Sunday even! Cheers, Vito Caputo