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Message-ID: <4F586266.8060504@linux.intel.com> Date: Wed, 07 Mar 2012 23:40:22 -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 08:24 PM, Huang Shijie wrote: > hi, > > On Thu, Mar 8, 2012 at 11:36 AM, Darren Hart <dvhart@...ux.intel.com> wrote: >> >> >> 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? >> > > futex_wait(). You are calling the futex syscall directly from your application? -- Darren > > I cherry-pick the > " df77abc ARM: 7099/1: futex: preserve oldval in SMP > __futex_atomic_op" to the arch/arm/include/asm/futex.h. > > > BR > Huang Shijie > >> -- >> 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 -- 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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