Re: [Xenomai] Segfault error 4 when running latency test (and all userspace tests)

[Philippe Gerum <rpm@xenomai.org>]

On 02/14/2013 08:32 PM, Kris Ellis wrote:
> Thanks, I'll look into your buldroot generator.
>

Well, actually this was a wrong advice, at least with respect to using 
buildroot: that generator does not use BR2, only the one I'm using 
locally does. But I had to hack the Xenomai support in BR2's 2010.02 
release, which you do have built-in now in the latest one.

> I have not tried using gdb yet, so I have no backtrace that I can provide.
>

This would help.

> As far as the --enable-x86-sep flag is concerned, is there a place in
> buildroot to turn this on, or do I have to go and manually modify the
> xenomai.mk file?
>

You need to fix up XENOMAI_CONF_OPT manually. I suspect that you might 
have a kernel compiled for a CPU which does not provide SEP, with the 
userland code configured by default with --enable-x86-sep.

So I would try check this first, prior to pulling more hairs:

First, log in your target box, and check whether /proc/cpuinfo mentions 
"sep" as an available feature for your processor. If not, then either:

- fix your i386 CPU configuration for the kernel and rebuild it, 
assuming your CPU does have sep actually (this is the most likely 
option), leaving userland as it is.

- Fix up XENOMAI_CONF_OPT to add --disable-x86-sep and rebuild userland, 
leaving the kernel config as it is.

To speed up things, I would suggest to try out these tests with no BR2 
in the picture for now, using a plain configure+build sequence for Xenomai.

-- 
Philippe.