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    SubjectRe: 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@linux.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@jonshouse.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
    >>>>
    >>>>
    >>>> --
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    >>
    >> --
    >> Darren Hart
    >> Intel Open Source Technology Center
    >> Yocto Project - Linux Kernel

    --
    Darren Hart
    Intel Open Source Technology Center
    Yocto Project - Linux Kernel


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