Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.25-1

[K.R. Foley]

Florian Schmidt wrote:
> On Sun, 14 Nov 2004 15:15:51 +0100
> Ingo Molnar <mingo@xxxxxxx> wrote:
>
>
> > > i just build and booted into 26-3 (w/o debugging stuff) and put a
> > > little load on the system (find /'s plus kernel compile plus
> > > rtc_wakeup -f 8192). Got this on the console:
> > >
> > > `IRQ 8` [14] is being piggy. need_resched=0, cpu=0
> > >
> > > and the machine locked. will build with debugging and try to
> > > reproduce.
> >
> > hm, i tried and couldnt reproduce this, so i'm curious what your
> > debugging build yields.
>
>
> not mch sadly. I tried booting into it once more and had to wait quite a
> while (around 30minutes) until the lock. I got this around 10 minutes before
> the lock though:
>
> Nov 15 00:09:23 mango kernel: bug in rtc_read(): called in state S_IDLE!

Still don't think this has anything to do with the lock. This message is 
usually produced by reading the rtc with a program that is running at a 
higher priority than 'IRQ 8'. Did you chrt the 'IRQ 8' thread? Make sure 
the reader priority is at least 1 less than the handler.

> The system locked up quitly again. no console dump. sys rq kept working (i
> could sync, remount ro and reboot). Does sys rq offer diagnosis which would
> be useful for you?

Possibly 't' for trace?

kr
> flo

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