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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-mm1-U10.2

    * Rui Nuno Capela <rncbc@rncbc.org> wrote:

    > > does the patch below help?

    > Nope. Same result:

    > SysRq : <3>BUG: sleeping function called from invalid context IRQ 1(776)
    > at kernel/mutex.c:37
    > in_atomic():0 [00000000], irqs_disabled():1

    interrupts are disabled. You used a -RT-U10.2/3 kernel, and have
    CONFIG_REALTIME enabled, right? Do you have this in
    drivers/net/netconsole.c, line 77:

    #ifdef PREEMPT_REALTIME
    /*
    * A bit hairy. Netconsole uses mutexes (indirectly) and
    * thus must have interrupts enabled:
    */
    local_irq_enable();
    #endif

    correct? Could you do this a few lines below:

    WARN_ON_RT(irqs_disabled());
    netpoll_send_udp(&np, msg, frag);
    WARN_ON_RT(irqs_disabled());

    to figure out who disables interrupts. Also, could you add the same two
    lines to net/core/netpoll.c, line 83:

    WARN_ON_RT(irqs_disabled());
    np->dev->poll_controller(np->dev);
    WARN_ON_RT(irqs_disabled());

    and send me either the full bootlog, or the _first_ such BUG message
    you'll be getting. Which network controller is this?

    Ingo
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