RTEMS scheduler bug ?

[Sebastian Huber]

On 04/04/2019 15:23, Joel Sherrill wrote:
>
>
> On Thu, Apr 4, 2019 at 7:28 AM Sebastian Huber 
> <sebastian.huber at embedded-brains.de 
> <mailto:sebastian.huber at embedded-brains.de>> wrote:
>
>     Hello,
>
>     On 04/04/2019 14:09, Catalin Demergian wrote:
>     > Hi Andrei,
>     > thank you for the elaborated answer !
>     >
>     > I checked my STM32 Cube settings, I have 3 enabled interrupts
>     and they
>     > all have the preemption priority/sub priority set to zero !
>     > it seems I ran into the same issue you had in 2015 :)
>     > I will take your advice - change the priorities, regenerate the
>     code
>     > and see what happens.
>
>     I mentioned this possible problem some months ago:
>
>     https://lists.rtems.org/pipermail/users/2018-September/032600.html
>
>     Andrei's answer is definitely a bit more elaborate.
>
>
> Thanks Andrei! I am glad you are past this but let's do a post-game 
> analysis of what
> could be better next time so no one else suffers as much. These are 
> random ideas
> and I am open to more.
>
> + Could this be detected at run-time during setup with a debug option?

This is difficult. Something from the outside destroys your operating 
system data structures. This is similar normal memory corruption.

>
> + Could this be written up in the BSP Guide so at least there is a 
> place to reference?
> Perhaps in a generic section on dealing with interrupt controllers

At least for ARM it is documented in the CPU Supplement:

https://docs.rtems.org/branches/master/cpu-supplement/arm.html#interrupt-processing

However, who knows that this manual exists and reads it? I would place 
this information in the user manual, but this was rejected.

-- 
Sebastian Huber, embedded brains GmbH

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