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    SubjectRe: Realtime Preemption, 2.6.12, Beginners Guide?
    Date
    On Friday 08 Jul 2005 20:48, Ingo Molnar wrote:
    > * Alistair John Strachan <s0348365@sms.ed.ac.uk> wrote:
    > > Unfortunately I see nothing like this when the machine crashes. Find
    > > attached my config, which has CONFIG_4KSTACKS and the options you
    > > specified. Are you sure this is sufficient to enable it?
    >
    > i have booted your .config, and stack overflow debugging is active and
    > working. So it probably wasnt a straight (detectable) stack recursion /
    > stack footprint issue.
    >

    Okay, I disabled IO-APIC and Local APIC, recompiled with (an otherwise
    identical) config.

    Got this (slightly better) oops. Figured out how to use my camera :-)

    http://devzero.co.uk/~alistair/oops6.jpeg

    Onto your stack-footprint metric. I don't know what the number means, but at a
    guess it's the size of the stack. Unfortunately, if this is the case, it's
    unlikely to be an overflow causing the crash. Here's a grep of dmesg just
    before the crash.

    [root] 21:39 [~] dmesg | grep new\ stack
    | new stack-footprint maximum: swapper/1, 1760 bytes.
    | new stack-footprint maximum: mount/471, 1716 bytes.
    | new stack-footprint maximum: cupsd/2623, 1564 bytes.
    | new stack-footprint maximum: kdm_greet/2845, 1528 bytes.
    | new stack-footprint maximum: krootimage/2846, 1204 bytes.
    | new stack-footprint maximum: konqueror/2938, 836 bytes.

    The complete traces are a bit long to include here, but I've uploaded the
    entire dmesg:

    http://devzero.co.uk/~alistair/dmesg.gz

    --
    Cheers,
    Alistair.

    personal: alistair()devzero!co!uk
    university: s0348365()sms!ed!ac!uk
    student: CS/CSim Undergraduate
    contact: 1F2 55 South Clerk Street,
    Edinburgh. EH8 9PP.
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