Re: [Xenomai-help] Interrupt shield

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

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Sebastian Smolorz wrote:
> Hello,
> 
> can anybody confirm this behaviour? If I configure the I-shield into the 
> kernel and start the latency test the RT tasks have not activated T_SHIELD 
> although the documentation states it (and btw in rt_task_create this bit is 
> set). If I try to set T_SHIELD inside the display task, the system hangs, a 
> soft lockup appears and sometimes a few correct lines of the display task are 
> printed, followed by the next lockup.
> 
> Explainable?
> 
> I'm testing on ARM with my S3C24xx I-pipe patch.

Have you tried over x86, too? The shield used to be off by default for
quite some time, and it's a fairly special feature. I wouldn't be
surprised if there is some regression sleeping. But it might also be an
ARM-specific issue.

Soft lockup sounds like the shield is not released appropriately again.
The tracer would visualise this nicely in verbose mode...

Jan


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