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

[Ingo Molnar]

* Rui Nuno Capela <rncbc@xxxxxxxxx> 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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