On 02/25/2013 11:18 AM, Anders Blomdell wrote:
> 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 :-).
Returning 1 is incorrect:
- you should probably jump to the end of the __ipipe_handle_irq function
- if the irq is irq 7, meaning a spurious irq, Linux should handle it,
so, __ipipe_dispatch_irq should be called. The real question however is
why does not the I-pipe have an irq for this vector.
--
Gilles.
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