Re: [Xenomai-help] native skin 2.5.0: rt_task_create() segfaults if stacksize parameter too small

[Stefan Kisdaroczi <kisda@domain.hid>]

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Am 07.01.2010 15:36, schrieb Gilles Chanteperdrix:
> Stefan Kisdaroczi wrote:
>> hi,
>>
>> i have upgraded xenomai to 2.5.0 (x86,32bit). My application segfaults when I
>> try to create a task with stacksize 2048, this worked with 2.4.10.
>> Because my app is written in pascal i have reproduced the problem with the
>> xenomai trivial-periodic.c example:
>>
>> -	rt_task_create(&demo_task, "trivial", 0, 99, 0);
>> +	rt_task_create(&demo_task, "trivial",16911, 99, 0);
>>
>> Stacksize 0 -> default stack size : ok
>> Stacksize > 0 and <= 16911 : Segmentation fault
>> Stacksize >= 16912 : ok
>>
>> Any hints ?
> 
> What does the task do?

Nothing :-)

I have attached a patch for the trivial-periodic.c example to reproduce the problem.

thx
kisda

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--- trivial-periodic.old	2009-03-31 10:51:10.000000000 +0200
+++ trivial-periodic.c	2010-01-07 16:24:28.000000000 +0100
@@ -12,30 +12,6 @@ RT_TASK demo_task;
 
 void demo(void *arg)
 {
-	RTIME now, previous;
-
-	/*
-	 * Arguments: &task (NULL=self),
-	 *            start time,
-	 *            period (here: 1 s)
-	 */
-	rt_task_set_periodic(NULL, TM_NOW, 1000000000);
-	previous = rt_timer_read();
-
-	while (1) {
-		rt_task_wait_period(NULL);
-		now = rt_timer_read();
-
-		/*
-		 * NOTE: printf may have unexpected impact on the timing of
-		 *       your program. It is used here in the critical loop
-		 *       only for demonstration purposes.
-		 */
-		printf("Time since last turn: %ld.%06ld ms\n",
-		       (long)(now - previous) / 1000000,
-		       (long)(now - previous) % 1000000);
-		       previous = now;
-	}
 }
 
 void catch_signal(int sig)
@@ -57,7 +33,7 @@ int main(int argc, char* argv[])
 	 *            priority,
 	 *            mode (FPU, start suspended, ...)
 	 */
-	rt_task_create(&demo_task, "trivial", 0, 99, 0);
+	rt_task_create(&demo_task, "trivial",16911, 99, 0);
 
 	/*
 	 * Arguments: &task,

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