From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754906Ab2CHDh1 (ORCPT ); Wed, 7 Mar 2012 22:37:27 -0500 Received: from mga01.intel.com ([192.55.52.88]:1875 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754212Ab2CHDh0 (ORCPT ); Wed, 7 Mar 2012 22:37:26 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="126420573" Message-ID: <4F582949.6000708@linux.intel.com> Date: Wed, 07 Mar 2012 19:36:41 -0800 From: Darren Hart User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120209 Thunderbird/10.0.1 MIME-Version: 1.0 To: Huang Shijie CC: jon@jonshouse.co.uk, linux-kernel@vger.kernel.org Subject: Re: Random process lockup on ARM board: alsa-lib-1.0.25, FUTEX_WAIT_PRIVATE References: <1329393691.6830.20.camel@jonspc> <1329512682.29051.1.camel@jonspc> <1329570128.6670.0.camel@jonspc> <4F400BBF.9020707@ladisch.de> <1329603022.1089.57.camel@jonspc> <4F41FC28.1070605@ladisch.de> <1329926198.22918.10.camel@jonspc> <4F45167A.6080706@ladisch.de> <1330043397.4669.44.camel@jonspc> <4F57C007.5050006@linux.intel.com> In-Reply-To: X-Enigmail-Version: 1.3.5 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/07/2012 06:28 PM, Huang Shijie wrote: > Hi, > > On Thu, Mar 8, 2012 at 4:07 AM, Darren Hart wrote: >> >> >> On 02/29/2012 01:12 AM, Huang Shijie wrote: >>> Hi , >>> >>> I meet a similar problem with the latest futex code. >>> >>> I play the video and the processes will hang at the futex. >> >> Are either of you able to bisect the kernel? At the very least can you > > I finially found my arch/arm/include/asm/futex.h is not the > latest, so i updated the header. Just make sure it matches your kernel version. > > And the futex issue is gone now. But a dataAbort issue appears, I am > not sure whether it caused by the futex patch. > I am debugging it now. Which APIs are you using that make the futex syscall? -- Darren > > > BR > Huang Shijie >> find two kernels where it works and where it does not? >> >> Hanging on FUTEX_WAIT_PRIVATE can be the symptom for higher level >> problems including userspace locking issues and race conditions. >> >> Huang, are you also on ARM? > > Yes, FREESCALE imx6q platform. > > BR > Huang Shijie >> >> -- >> Darren >> >>> >>> BR >>> Huang Shijie >>> >>> On Fri, Feb 24, 2012 at 8:29 AM, Jonathan Andrews wrote: >>>> Using kernel 3.2.5 with alsa-lib 1.0.25, all compiled with generic >>>> Debian arm-linux-gnueabi toolchain. >>>> >>>> arm-linux-gnueabi-gcc (Debian 4.3.2-1.1) 4.3.2 >>>> Was used to build kernel, alsa-lib and application. >>>> >>>> Changing gcc version, kernel version or alsa-lib version makes the >>>> problem worse or better, but ALL versions seem to suffer this problem. I >>>> have also seen it once on Intel (but only once so far). >>>> >>>> Something seeks broken at a lower layer than im using. I simply don't >>>> have the skill to debug it. >>>> >>>> The hardware is a USB cm109 audio adapter, but the problem seems to show >>>> on more than this one driver. >>>> >>>> The audio application writing to alsa will freezes at random intervals, >>>> infrequent at the moment, last one was after runtime 20H 37M 29S. Two >>>> processes are running, one reading from the sound device and one writing >>>> to the sound device. I am not using threading or anything very clever >>>> just generic alsa functions. >>>> >>>> This is the only diagnostic I can generate so far as running the >>>> application under strace slows it to the point it no longer functions >>>> enough to generate the problem. >>>> >>>> ARM / # strace -p 417 >>>> Process 417 attached - interrupt to quit >>>> futex(0x175734, FUTEX_WAIT_PRIVATE, 2, NULL^C >>>> Process 417 detached >>>> >>>> ARM / # uname -a >>>> Linux (none) 3.2.5 #2 Wed Feb 22 17:11:52 GMT 2012 armv4tl GNU/Linux >>>> ARM / # uptime >>>> 22:36:19 up 22:36, 0 users, load average: 0.15, 0.16, 0.18 >>>> ARM / # cat /proc/cpuinfo >>>> Processor : ARM920T rev 0 (v4l) >>>> BogoMIPS : 199.06 >>>> Features : swp half thumb crunch >>>> CPU implementer : 0x41 >>>> CPU architecture: 4T >>>> CPU variant : 0x1 >>>> CPU part : 0x920 >>>> CPU revision : 0 >>>> >>>> >>>> Any help welcome. >>>> >>>> Thanks, >>>> Jon >>>> >>>> >>>> -- >>>> 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/ >>> -- >>> 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/ >> >> -- >> Darren Hart >> Intel Open Source Technology Center >> Yocto Project - Linux Kernel -- Darren Hart Intel Open Source Technology Center Yocto Project - Linux Kernel