Re: [Xenomai-help] Sporadic PC freeze after rt_task_start

["M. Koehrer" <mathias_koehrer@domain.hid>]

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Hi!

After a couple of over-night test runs, I finally got an NMI watchdog detected lockup with the sporadic freeze option.
I started the system with the argument nmi_watchdog=1 (also isolcpus=1).
See the code below. As I have not connected a serial console, I have attached a screen shot in a fairly
bad quality as jpg file... However, it is good enough to be able to read everything... 
The lockup is in function rpi_pop [xeno_nucleus].
It is called from gatekeeper_thread and from default_wake_function.
See the attached jpg for details.

Perhaps that helps to identify the issue.

Regards

Mathias

--------- BEGIN CODE ---------------
#include <stdio.h>
#include <sys/mman.h>
#include <sys/io.h>

#include <native/task.h>
#include <native/sem.h>


RT_TASK taska_desc;

void mytaska(void *cookie)
{
    int i;

    outb(0x80,0x80);

    for (i=0; i < 5; i++)
    {
        rt_task_sleep(5000000);
        outb(0x90,0x80);
        // printf("Task A\n");
    }
    outb(0xa0,0x80);

    // printf("End of task A\n");
}


int main(void)
{
    int i;
    int j;
    ioperm(0x80, 1, 1);
    mlockall(MCL_CURRENT|MCL_FUTURE);

    for (j=0; j < 10000; j++)
        for (i=10; i < 15000; i++)
        {
            outb(0x20, 0x80);
            rt_task_create(&taska_desc, "mytaska", 0, 81, T_JOINABLE | T_FPU | T_CPU(1));
            //    outb(0x30, 0x80);
            rt_task_start(&taska_desc, &mytaska, NULL);
            outb(0x40, 0x80);
            usleep(1500);
            outb(0x50, 0x80);

            rt_task_join(&taska_desc);
            if ( i % 100 == 0)
                printf("Loop %i %i\n", j,  i);
        }


    return 0;
}

--------- END CODE ---------------

 


----- Original Nachricht ----
Von:     Jan Kiszka <jan.kiszka@domain.hid>
An:      "M. Koehrer" <mathias_koehrer@domain.hid>
Datum:   17.07.2007 00:42
Betreff: Re: [Xenomai-help] Sporadic PC freeze after rt_task_start

> M. Koehrer wrote:
> > Hi Jan,
> > 
> > I left my PC running the whole weekend using the kernel command line
> parameter "nmi_watchdog=1".
> > However, using this option, the PC did not freeze at all...
> > This is really ugly.
> > The kernel configuration was the same I mailed a couple of days ago.
> 
> Mpf. What about nmi_watchdog=2? It's said to tick at lower rate, thus
> may not have such an "unwanted" side-effect.
> 
> > 
> > Also, I tried (a couple of hours) to run with Xeno debugging (Nucleus
> debugging and Watchdog support) enabled. However, this did not lead to a
> freeze either.
> > 
> > This seems to be a really nasty timing issue...
> > 
> > Any ideas on how to continue are welcome.
> 
> No. I had no time to think further so far.
> 
> Jan
> 
> 

-- 
Mathias Koehrer
mathias_koehrer@domain.hid


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