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    SubjectRe: 2.6.9-rc2-mm4 ps hang ?
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    Date
    On Fri, 2004-10-01 at 16:49, Andrew Morton wrote:
    > Badari Pulavarty <pbadari@us.ibm.com> wrote:
    > >
    > > Here is the full sysrq-t output.
    >
    > What's this guy up to?
    ...
    >
    > Something is seriously screwed up if it's stuck in try_to_wake_up(). Tried
    > generating a few extra traces?
    >
    > Then again, maybe we're missing an up_read() somewhere. hrm, I'll check.
    >

    It reproduced again. I think this is the one causing all the troubles..

    db2fmcd D ffffffff80132e2a 0 10854 7636
    (NOTLB)
    00000101bae85ef8 0000000000000002 0000020800000018 00000101d9ddd550
    0000000100000084 000001016d490e20 000001016d491158
    00000101d9ddd550
    0000000000000206 ffffffff801353cb
    Call Trace:<ffffffff801353cb>{try_to_wake_up+971}
    <ffffffff804455f0>{__down_write+128}
    <ffffffff80125e6f>{sys32_mmap+143}
    <ffffffff80124af1>{ia32_sysret+0}

    when I tried looking at /proc/10854 - it hung.

    elm3b29:~ # cd /proc/10854
    elm3b29:/proc/10854 # l

    ls D 000000000051bb70 0 28029 27737
    (NOTLB)
    00000101ac9b1e28 0000000000000006 702e6d6574737973 ffffffff8054f240
    000000000000009f 00000101df4fa9a0 00000101df4facd8
    0000000000000000
    000000d000000002 00000101ac9b1e68
    Call Trace:<ffffffff80445692>{__down_read+130}
    <ffffffff801b79a9>{proc_exe_link+73}
    <ffffffff801b7745>{proc_pid_readlink+165}
    <ffffffff8018a511>{sys_readlink+161}
    <ffffffff8011075e>{system_call+126}


    I have no idea what db2fmcd is stuck on. I will try to find out more..

    Thanks,
    Badari


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