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    SubjectRe: kmemleak, cpu usage jump out of nowhere
    Date
    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%.

    --
    Catalin


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