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Date: Mon, 25 Feb 2013 11:18:07 +0100
From: Anders Blomdell <anders.blomdell@control.lth.se>
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Subject: Re: [Xenomai] kernel BUG at arch/x86/kernel/ipipe.c:589! on
	motherboard DX79SI
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To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Xenomai <xenomai@xenomai.org>

On 2013-02-15 16:26, Jan Kiszka wrote:
> On 2013-02-15 16:15, Anders Blomdell wrote:
>> Hi,
>>
>> I have a DX79SI that dies with "kernel BUG at
>> arch/x86/kernel/ipipe.c:589!" when running Xenomai. This is not very
>> surprising since when running the system with an ordinary kernel thera
>> are a few 'do_IRQ: X.Y No irq handler for vector (irq -1)' each day.
>>
>> Question is if it would be possible to do something less fatal than
>> 'BUG_ON(irq < 0);' in the code below:
>
> This remains a bug that has to be understood.
>
>>
>> int __ipipe_handle_irq(struct pt_regs *regs)
>> {
>>      struct ipipe_percpu_data *p = __ipipe_this_cpu_ptr(&ipipe_percpu);
>>      int irq, vector = regs->orig_ax, flags = 0;
>>      struct pt_regs *tick_regs;
>>
>>      if (likely(vector < 0)) {
>>          irq = __this_cpu_read(vector_irq[~vector]);
>>          BUG_ON(irq < 0);
>>      } else { /* Software-generated. */
>>          irq = vector;
>>          flags = IPIPE_IRQF_NOACK;
>>      }
>
> Kernel 3.5.7 with latest I-pipe?
Yes.

> This is the second report of this kind,
> see [1] for the discussion and suggestions. If you don't have KGDB and
> that kind enabled, try Gilles' instrumentations.
After a running xenomai five and a half day on a DX58SO motherboard, the 
system crashed, leaving a single 'do_IRQ: 2.166 No irq handler for 
vector (irq -1)' on our logserver.

I'm planning to put in Gilles instrumentations and change the BUG_ON to 
a WARN_ON/WARN, but what should I return after that (my guess is a 
'return 1', but waiting a week to be proved wrong would be a waste of 
time :-).

>
> Jan
>
> [1] http://thread.gmane.org/gmane.linux.real-time.xenomai.users/15936
>
Regards

Anders

-- 
Anders Blomdell                  Email: anders.blomdell@control.lth.se
Department of Automatic Control
Lund University                  Phone:    +46 46 222 4625
P.O. Box 118                     Fax:      +46 46 138118
SE-221 00 Lund, Sweden