Re: [Xenomai-help] Freeze on SMP x86-64

[Jan Kiszka <jan.kiszka@domain.hid>]

Roman Pisl wrote:
> On 6.10.2009 15:56, Jan Kiszka wrote:
>> Roman Pisl wrote:
>>> ...
>>>> Is there a chance to grab the panic log via serial line? The first of
>>>> your two screenshots indicate that there might have happened something
>>>> interesting before the NMI triggered, but it's scrolled out of sight.
>>>>
>>>> Jan
>>>>
>>> Hello,
>>> here I send kernel panic (triggered by rt_task_sleep and latency test)
>>> grabbed via serial line.
>> Hmm, still only NMI alarms...
>>
>>> I'm ready to help with resolving this issue.
>> Could you try enabling the I-pipe tracer with function tracing? It
>> should dump a trace of the functions that were executed before the
>> watchdog triggered. You may need to extend the number of tracepoints a
>> bit, try "echo 1000>  /proc/ipipe/trace/back_trace_points".
>>
>> Jan
>>
> 
> Then I had I/O activity on the background and got this.
> 

Try without CONFIG_IPIPE_DEBUG_INTERNAL (it triggers when we printk from
NMI context). Please also raise the NMI threshold
(CONFIG_XENO_HW_NMI_DEBUG_LATENCY_MAX) to 1 ms or so. It may otherwise
trigger too early if there are hardware related delays + the tracing
overhead.

Jan

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