From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: Re: [Xenomai-help] Xenomai v2.2.3
From: Philippe Gerum <rpm@xenomai.org>
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Date: Wed, 20 Sep 2006 20:33:36 +0200
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To: Jeff Webb <jeff.webb@domain.hid>
Cc: xenomai@xenomai.org

On Wed, 2006-09-20 at 13:24 -0500, Jeff Webb wrote:
> Philippe Gerum wrote:
> > On Wed, 2006-09-20 at 09:44 -0500, Jeff Webb wrote:
> > 
> >> Switching to xenomai-2.2.3/linux-2.4.32 (ipipe-1.2) fixed this problem.
> > 
> > Could you try running 2.2.3 stock + fpu fix patch over 2.4.33.3/1.3-00,
> > and 2.2.3 stock over 2.4.33.3/1.2-08 ? I'm trying to find out if there
> > is a dependency on the kernel version, and/or the Adeos release, and/or
> > the fpu issue, for the segfault bug. TIA,
> 
> I just tested two more builds.  Both of them have the segfault bug.  Here is a summary of the results thus far:
> 
> Latency test works:
>   linux-2.4.32, adeos-ipipe-2.4.32-i386-1.2-07.patch
> 
> Latency test segfaults:
>   linux-2.4.33.3, adeos-ipipe-2.4.33-i386-1.3-00.patch
>   linux-2.4.33.3, adeos-ipipe-2.4.33-i386-1.2-07.patch
>   linux-2.4.33.3 (+ FPU fix patch), adeos-ipipe-2.4.33-i386-1.3-00.patch
> 
> All of these are with xenomai-2.2.3.  The last one has the FPU fix patch applied.  So, it appears to be something in the newer kernel version...
> 

Ok, that helps thanks. Now, running the latency test over GDB instead of
using the "run" script would likely give us a backtrace for the
segfault. I'd be interested to know where the latency application is
sent the fault signal. E.g.

modprobe xeno_nucleus
modprobe xeno_native
(if needed)

then,

cd /usr/xenomai/testsuite/latency
gdb latency
r
...(SIGSEGV)...
bt

TIA,

> Thanks,
> 
> Jeff
> 
> 
> 
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-- 
Philippe.