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Date: Thu, 12 Jun 2014 23:45:16 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] Gdb freezes when stepping through rt_task_spawn.
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To: Philippe Gerum <rpm@xenomai.org>, Marco Tessore <marco.tessore@axelsw.it>, xenomai@xenomai.org

On 06/12/2014 10:51 PM, Philippe Gerum wrote:
> On 06/12/2014 07:58 PM, Gilles Chanteperdrix wrote:
>> On 06/12/2014 03:38 PM, Marco Tessore wrote:
>>> Thank you, I will try that commit.
>>> But I have another question about it:
>>> does the commit involve the patch to the kernel?
>>> Since my kernel was patched using i-pipe git for the vanilla 3.10, but
>>> applied to a customized version of 3.11,
>>> if the commit involves the kernel patch, it can be difficult for me to
>>> upgrade.
>>
>> If you kept the ipipe kernel separated from Xenomai kernel sources, the
>> change is a change in xenomai sources, so the update should be painless.
>> If you put the xenomai-patched kernel under source control, then it will
>> be harder.
>>
> 
> ENOSYS would rather be symptomatic of this bug which is ARM-specific:
> http://git.xenomai.org/ipipe.git/commit/?h=ipipe-3.10&id=e410a5e77323d53277d625e5dafe166cdcd64afb

Indeed. This fix for 3.10 does not seem right though. The real fix is 
to move the local_restart jump label, as in:

http://git.xenomai.org/ipipe.git/commit/?h=ipipe-3.14&id=d7a5e4762535f55bfff8eafbf1c1dde214d09bd6

> 
> OTOH, the patch below fixes a spurious EINTR error within the task 
> creation syscall, which may well end up in a lockup:
> http://git.xenomai.org/xenomai-2.6.git/commit/?id=589882956280d5cb4fdc181a5fcd5ae1188ab6ed
> 
> This is one of the situations where knowing the CPU architecture 
> involved would help a lot.

Yes, indeed, should have directed to the "Request for information" page.


-- 
                                                                Gilles.