Re: [Xenomai] xeno3_rc3 - Watchdog detected hard LOCKUP

[Jeroen Van den Keybus <jeroen.vandenkeybus@gmail.com>]

2015-04-02 21:15 GMT+02:00 Gilles Chanteperdrix
<gilles.chanteperdrix@xenomai.org>:
> On Thu, Apr 02, 2015 at 08:47:30PM +0200, Jeroen Van den Keybus wrote:
>> I've been testing for two weeks now and the system has crashed three
>> more times under dohell load. Two with 3.14.28, the other with 3.16.0.
>> Time to crash varied between 3 hours and 90 hours.
>>
>> The scenario is always the same: one CPU (has already been any of the
>> 4) gets stuck and the others start reporting soft lockups. The trouble
>> is: I've been unable to get hold of a stack trace of the hardlocked
>> CPU. SysRq L does not work and the CPU does not respond to the NMIs it
>> is given from the softlocked CPUs. I also enabled hardlockup_panic to
>> make sure I get all stack traces but to no avail.
>>
>> Does anyone know another trick to possibly get the backtrace from this CPU ?
>

> You can modify ipipe_trace_freeze to get the trace of a different
> CPU.

Ah yes, I forgot. It is probably locked outside the Linux domain. That
would explain why the regular panic won't work. Is that correct ?

> But if I were you I would test the latest stable release
> first.

Ok. I'll do that. I would have liked to know the cause of the lockups
though, And above all, we wanted to test Xenomai 3 from the start of a
new project.

Thanks

J.

>
> --
>                                             Gilles.