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    SubjectRe: kmemleak, cpu usage jump out of nowhere
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    Dear Catalin

    On Wed, Jul 14, 2010 at 11:57 AM, Catalin Marinas
    <catalin.marinas@arm.com> wrote:
    > Zeno Davatz <zdavatz@gmail.com> wrote:
    >> I got a new Intel core-8 i7 processor.
    >>
    >> I am on kernel uname -a
    >>
    >> Linux zenogentoo 2.6.35-rc5 #97 SMP Tue Jul 13 16:13:25 CEST 2010 i686
    >> Intel(R) Core(TM) i7 CPU 960 @ 3.20GHz GenuineIntel GNU/Linux
    >>
    >> Sometimes in the middle of nowhere all of a sudden all of my 8-cores
    >> are at 100% CPU usage and my machine really lags and hangs and is not
    >> useable anymore. Some random process just grabs a bunch CPUs according
    >> to htop.
    >>
    >> dmesg tell me that
    >>
    >> kmemleak: 38 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
    >> kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
    >> kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
    >> kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
    >> kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
    >> kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
    >
    > These may be related to the NO_BOOTMEM configuration (I sent a patch in
    > a separate reply).
    >
    > But even when kmemleak scans the memory, it only uses a single thread
    > and you should only see a single CPU going to 100%. I don't think
    > kmemleak scanning can explain why all the 8 cores are going up to 100%.

    I am doing:

    /usr/src/my2.6> sudo patch -p1 < patch_catalin
    patching file mm/bootmem.c
    Hunk #1 FAILED at 435.
    Hunk #2 FAILED at 461.
    2 out of 2 hunks FAILED -- saving rejects to file mm/bootmem.c.rej
    patching file mm/page_alloc.c
    Hunk #1 FAILED at 3659.
    1 out of 1 hunk FAILED -- saving rejects to file mm/page_alloc.c.rej

    Any hints why it wont apply? Will this patch be in the next RC?

    Best
    Zeno


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