Re: [Xenomai-core] Frozen timer IRQ

[Philippe Gerum <rpm@xenomai.org>]

Philippe Gerum wrote:
> Gilles Chanteperdrix wrote:
> 
>> Jan Kiszka wrote:
>>  > Hi,
>>  >  > my colleagues and I need some hint where to continue our search 
>> for the
>>  > cause of a weird cleanup issue:
>>  >  > An application of our robotics framework sometimes terminates 
>> (though
>>  > successfully) in a way that the system timer IRQ no longer arrives
>>  > afterwards or no re-program takes place anymore. All other Linux IRQs
>>  > are fine (Ethernet, keyboard, etc.). I cannot provide an easy test 
>> case
>>  > yet as besides the framework some expensive gyroscope and the 16550A
>>  > driver are involved.
>>
>> I observed a similar issue when xnpod_stop_timer was called when
>> shutting down the posix skin. I assumed that the problem was that
>> xnpod_shutdown already called xnpod_stop_timer, so xnpod_stop_timer (and
>> in particular xnarch_stop_timer) ended up being called twice.
>>
> 
> Err, sorry. Forget about my previous reply: xnarch_stop_timer is _not_ 
> protected by the XNTIMED flag, but only the last part of the 
> housekeeping chores performed upon stopping the systimer are. IOW, this 
> is a latent bug, and xnpod_stop_timer should be fixed.
> 

Commit 884 should do that.

-- 

Philippe.