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Date: Wed, 07 Mar 2012 19:36:41 -0800 From: Darren Hart <dvhart@...ux.intel.com> To: Huang Shijie <shijie8@...il.com> CC: jon@...shouse.co.uk, linux-kernel@...r.kernel.org Subject: Re: Random process lockup on ARM board: alsa-lib-1.0.25, FUTEX_WAIT_PRIVATE On 03/07/2012 06:28 PM, Huang Shijie wrote: > Hi, > > On Thu, Mar 8, 2012 at 4:07 AM, Darren Hart <dvhart@...ux.intel.com> 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 <jon@...shouse.co.uk> 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 <unfinished ...> >>>> 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@...r.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@...r.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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