Very strange bug

[Joel Sherrill]

Pascal Chevochot wrote:

> Hello,
> 
> Below, you can find a short program. With rtems 4.5.0/bsp586, it works
> fine. But if I uncomment line `printf("2\n");', then this programm
> badly crashes !!! Now, if I replace `printf' by `puts', it works !!!
> 
> Could someone make this test on another bsp586 ?


I ran it on the sparc/erc32 BSP and it worked fine.  It produced this 
output:

1
id
2
wakeup

And then went into a tight look in mainThread.  What else does it do?

I would normally suspect a stack problem.  I would suspect that printf 
takes more
memory than puts.  But that is just a guess.

> 
> Pascal.
> 
> ------- begin ----------
> #include <rtems.h>
> 
> extern rtems_task Init(rtems_task_argument arg);
> 
> #define CONFIGURE_INIT
> #include <bsp.h> /* for device driver prototypes */
> 
> #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
> #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
> #define CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER
> 
> #define CONFIGURE_MAXIMUM_TASKS            10
> 
> #define CONFIGURE_RTEMS_INIT_TASKS_TABLE
> 
> #define CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM
> 
> #include <confdefs.h>
> 
> #include <string.h>
> #include <stdlib.h>
> #include <assert.h>
> #include <stdio.h>
> 
> rtems_task mainThread(rtems_task_argument arg)
> {
>   uint tid;
>   rtems_status_code r;
> 
>   tid=arg&65535;
> 
>   printf("id\n");
> 
>   r=rtems_task_suspend(RTEMS_SELF);
>   assert(r==RTEMS_SUCCESSFUL);
>   printf("wakeup\n");
>   while (1);
> }
> 
> /*+
>   Main.
> +*/
> rtems_task Init(rtems_task_argument arg)
> {
>   {
>     rtems_status_code r;
>     rtems_name name;
>     rtems_id tid[10];
>     int i=0;
>   
>     name=rtems_build_name('T','0','0','0');
>     r=rtems_task_create(name,100,4096,RTEMS_NO_PREEMPT,RTEMS_FLOATING_POINT,tid+i);
>     if (r != RTEMS_SUCCESSFUL)
>       printf("->%d\n",r);
>     assert(r==RTEMS_SUCCESSFUL);
>     r=rtems_task_start(tid[i],mainThread,(rtems_task_argument)i);
>     assert(r==RTEMS_SUCCESSFUL);
>     printf("1\n");
>     r=rtems_task_wake_after(100);
>     assert(r==RTEMS_SUCCESSFUL);
>     printf("2\n");
>     r=rtems_task_is_suspended(tid[i]);
>     assert(r==RTEMS_ALREADY_SUSPENDED);
>     r=rtems_task_resume(tid[0]);
>     assert(r==RTEMS_SUCCESSFUL);
>     r=rtems_task_wake_after(100);
>     assert(r==RTEMS_SUCCESSFUL);
>     
>     r=rtems_task_suspend(RTEMS_SELF);
>     assert(r==RTEMS_SUCCESSFUL);
>   }
>   rtems_task_suspend(RTEMS_SELF);
> }
> ------- end ------------
> 
> 
> 
> 
> 
>