From mboxrd@z Thu Jan 1 00:00:00 1970 From: peter@hurleysoftware.com (Peter Hurley) Date: Thu, 27 Dec 2012 08:03:24 -0500 Subject: [REGRESSION][3.8.-rc1][ INFO: possible circular locking dependency detected ] In-Reply-To: <20121227083618.GA9775@S2101-09.ap.freescale.net> References: <201212221628.26640.maciej.rutecki@gmail.com> <20121226023435.GE25478@S2101-09.ap.freescale.net> <20121227083618.GA9775@S2101-09.ap.freescale.net> Message-ID: <1356613404.16896.4.camel@thor.lan> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, 2012-12-27 at 16:36 +0800, Shawn Guo wrote: > On Wed, Dec 26, 2012 at 10:34:39AM +0800, Shawn Guo wrote: > > It seems that I'm running into the same locking issue. My setup is: > > > > - i.MX28 (ARM) > > - v3.8-rc1 > > - mxs_defconfig > - The warning is seen when LCD is blanking > > > > The warning disappears after reverting patch daee779 (console: implement > lockdep support for console_lock). Is it suggesting that the mxs > frame buffer driver (drivers/video/mxsfb.c) is doing something bad? > > Shawn > > > > > [ 602.229899] ====================================================== > > [ 602.229905] [ INFO: possible circular locking dependency detected ] > > [ 602.229926] 3.8.0-rc1-00003-gde4ae7f #767 Not tainted > > [ 602.229933] ------------------------------------------------------- > > [ 602.229951] kworker/0:1/21 is trying to acquire lock: > > [ 602.230037] ((fb_notifier_list).rwsem){.+.+.+}, at: [] __blocking_notifier_call_chain+0x2c/0x60 You want this patch https://patchwork.kernel.org/patch/1757061/ From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752738Ab2L0NDi (ORCPT ); Thu, 27 Dec 2012 08:03:38 -0500 Received: from mailout39.mail01.mtsvc.net ([216.70.64.83]:49809 "EHLO n12.mail01.mtsvc.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752046Ab2L0NDg (ORCPT ); Thu, 27 Dec 2012 08:03:36 -0500 Message-ID: <1356613404.16896.4.camel@thor.lan> Subject: Re: [REGRESSION][3.8.-rc1][ INFO: possible circular locking dependency detected ] From: Peter Hurley To: Shawn Guo Cc: Maciej Rutecki , LKML , Cong Wang , linux-arm-kernel@lists.infradead.org, Daniel Vetter , Greg Kroah-Hartman Date: Thu, 27 Dec 2012 08:03:24 -0500 In-Reply-To: <20121227083618.GA9775@S2101-09.ap.freescale.net> References: <201212221628.26640.maciej.rutecki@gmail.com> <20121226023435.GE25478@S2101-09.ap.freescale.net> <20121227083618.GA9775@S2101-09.ap.freescale.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.6.3-0pjh1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Authenticated-User: 125194 peter@hurleysoftware.com X-MT-ID: 8fa290c2a27252aacf65dbc4a42f3ce3735fb2a4 X-MT-INTERNAL-ID: 8fa290c2a27252aacf65dbc4a42f3ce3735fb2a4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2012-12-27 at 16:36 +0800, Shawn Guo wrote: > On Wed, Dec 26, 2012 at 10:34:39AM +0800, Shawn Guo wrote: > > It seems that I'm running into the same locking issue. My setup is: > > > > - i.MX28 (ARM) > > - v3.8-rc1 > > - mxs_defconfig > - The warning is seen when LCD is blanking > > > > The warning disappears after reverting patch daee779 (console: implement > lockdep support for console_lock). Is it suggesting that the mxs > frame buffer driver (drivers/video/mxsfb.c) is doing something bad? > > Shawn > > > > > [ 602.229899] ====================================================== > > [ 602.229905] [ INFO: possible circular locking dependency detected ] > > [ 602.229926] 3.8.0-rc1-00003-gde4ae7f #767 Not tainted > > [ 602.229933] ------------------------------------------------------- > > [ 602.229951] kworker/0:1/21 is trying to acquire lock: > > [ 602.230037] ((fb_notifier_list).rwsem){.+.+.+}, at: [] __blocking_notifier_call_chain+0x2c/0x60 You want this patch https://patchwork.kernel.org/patch/1757061/