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

    On Wed, Jul 14, 2010 at 10:05 AM, Pekka Enberg <penberg@cs.helsinki.fi> wrote:
    > On Wed, Jul 14, 2010 at 9:12 AM, 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.
    >
    > Why did you enable CONFIG_DEBUG_KMEMLEAK? Memory leak scanning is
    > likely the source of these pauses.

    Shall I disable that? I will do that and try again.

    >> I am attaching you the file from /sys/kernel/debug/kmemleak
    >
    > Zeno, can you post your dmesg and .config, please?

    Sure, see attached files.

    > The third class of leaks is relateed to drm_setversion():
    >
    > unreferenced object 0xf6b10620 (size 32):
    >  comm "X", pid 2268, jiffies 4294894722 (age 57250.228s)
    >  hex dump (first 32 bytes):
    >    6e 6f 75 76 65 61 75 40 70 63 69 3a 30 30 30 30  nouveau@pci:0000
    >    3a 30 35 3a 30 30 2e 30 00 00 00 00 00 00 00 00  :05:00.0........
    >  backtrace:
    >    [<c145d4eb>] kmemleak_alloc+0x27/0x4d
    >    [<c10adb0c>] __kmalloc+0xd4/0x10d
    >    [<c125315e>] drm_setversion+0x140/0x1bf
    >    [<c12514f2>] drm_ioctl+0x258/0x3d7
    >    [<c10bdd42>] vfs_ioctl+0x27/0x9b
    >    [<c10bdee2>] do_vfs_ioctl+0x66/0x54b
    >    [<c10be3fa>] sys_ioctl+0x33/0x4f
    >    [<c102339c>] sysenter_do_call+0x12/0x2c
    >    [<ffffffff>] 0xffffffff
    >
    > for which I wasn't able to find the allocation call-site. Maybe Zeno
    > has some out-of-tree DRM module?

    I am using the nouveau drivers in the kernel as I got an Nvidia Graphics card.

    05:00.0 VGA compatible controller: nVidia Corporation G98 [GeForce
    8400 GS] (rev a1) (prog-if 00 [VGA controller])
    Subsystem: ASUSTeK Computer Inc. Device 8321
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
    Memory at d0000000 (64-bit, prefetchable) [size=256M]
    Memory at f8000000 (64-bit, non-prefetchable) [size=32M]
    I/O ports at ec00 [size=128]
    [virtual] Expansion ROM at fb000000 [disabled] [size=128K]
    Capabilities: [60] Power Management version 3
    Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
    Capabilities: [78] Express Endpoint, MSI 00
    Capabilities: [100] Virtual Channel <?>
    Capabilities: [128] Power Budgeting <?>
    Capabilities: [600] Vendor Specific Information <?>
    Kernel driver in use: nouveau

    Best
    Zeno
    [unhandled content-type:application/octet-stream][unhandled content-type:application/octet-stream]
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