On 2013-04-23 15:53, Kai Bollue wrote:
> Hello Jan,
> thank you for your reply.
>
> On 23.04.2013 14:18, Jan Kiszka wrote:
>> Does sysrq still work then? sysrq-l would be interesting e.g.
>
> No. It works before the freeze (so it's set up correctly), but not
> afterwards.
>
>>> - Either nothing at all, or
>>>
>>> -
>>> [ 481.189349] INFO: rcu_bh detected stalls on CPUs/tasks: { 2}
>>> (detected by 0, t=60042 jiffies)
>>> [ 481.291572] INFO: Stall ended before state dump start
>>> [ 541.224383] INFO: rcu_preempt detected stalls on CPUs/tasks: { 2}
>>> (detected by 0, t=60002 jiffies)
>>> [ 541.331818] INFO: Stall ended before state dump start
>>> (repeated), or
>>>
>>> -
>>> [ 2333.757994] Xenomai: Unbalanced lock/unlock
>> Ah, here's where the problem start.
>>
>> CONFIG_IPIPE_TRACE_PANIC may provide further information. Enable it via
>> the I-pipe tracer. Then, before triggering the lockup, increase the
>> backtrace points to, say, 2000:
>>
>> echo 2000 > /proc/ipipe/trace/back_trace_points
>
> New console output attached.
Hmm, broken in several ways. First of all, backtraces aren't working
properly in your setup. Please enable CONFIG_FRAME_POINTER. You can
leave the ipipe tracer knob above at its default for the next run, and
no need for the sysrq-l to repeat.
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux
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