Re: [Xenomai-help] invalid use of FPU in Xenomai context

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

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Jeff Webb wrote:
> If I run the attached program, I get the following result:
> 
>  [root]# ./mqtest2
>  CPU time limit exceeded
> 
> The kernel log contains:
> 
>  Oct 25 14:13:03 kernel: invalid use of FPU in Xenomai context at 0x80492f6

Can you do a backtrace in gdb?

> 
> If I change the WRITE_SIZE #define at the top of the program to 511
> instead of 512, I do not get an error message, and the program works as
> expected.
> 
> I have tried this under two versions of Xenomai with the same result:
>  1) Xenomai 2.2.3 with the FPU patch posted here:
>     https://mail.gna.org/public/xenomai-help/2006-09/msg00157.html
>     (adeos-ipipe-2.6.17-i386-1.4-00.patch)
>  2) Xenomai 2.2.4 (adeos-ipipe-2.6.17-i386-1.5-00.patch)
> 
> Other details:
>  Linux version 2.6.17.13
>  AMD Athlon(tm)64 X2 Dual Core Processor  4400+
>  Fedora Core 5
>  SMP kernel
> 
> This is very similar to a problem I described last month that affected
> my linux-2.4 system:
> https://mail.gna.org/public/xenomai-help/2006-09/msg00143.html . 
> Perhaps these problems are related.
> 
> Does anyone see a problem with what I'm doing here?  If not, can you
> reproduce the problem?
> 

Could you also try if this patch changes anything:

https://mail.gna.org/public/xenomai-core/2006-10/msg00069.html

(Could be the case if you happen to use some FPU-touching Linux driver.)

Jan


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