printf crashes?

[Joel Sherrill]

Leon Pollak wrote:
> Hello, all.
>
> For the third day I am fighting with the problem: my rtems 4.8.0, MPC8260 
> application performs "brunch to zero address" (break point is set on address 
> zero) from inside the:
> ../newlib/libc/stdio/fflush.c:196 (_fflush_r routine)
> ../newlib/libc/stdio/fvwrite.c:257 (__sfvwrite_r routine)
> ../newlib/libc/stdio/vfprintf.c:177 (__sprint_r routine)
> ../newlib/libc/stdio/vfprintf.c:1329 (_vfprintf_r routine)
> ../newlib/libc/stdio/printf.c:52 (printf routine)
> and the calling printf is:
> printf("W=%d P=%d\n", 1, 1);
>
> The question is: as I do printf from several tasks (may be simultaneously), 
> may this be the cause of the problem somehow?
>
>   
I doubt it but it is possible that you are blowing a stack
or have a buffer/variable on the stack that is getting overwritten
so when you return, you find yourself with a bad return address.
> I know that newlib is re-entrant, if some precautions are taken. But are they 
> taken by default, or I need to do something special (never previously used 
> printf extensively)?
>
> Many thanks ahead for any advice.
>   


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Joel Sherrill, Ph.D.             Director of Research & Development
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