Stack Checker in rtems-4.8.0 - is it broken?

[Robert S. Grimes]

Joel Sherrill wrote:
> Robert S. Grimes wrote:
>> Hi,
>>
>> Does the stack checker still work?  My app using powerpc/virtex BSP
>> seems to fail on startup when the stack checker task is created in
>> taskinitusers.c/_RTEMS_tasks_Initialize_user_tasks_body().  I get an
>> exception 7 - here is the dump:
>>
>>   
> There is no stack checker task.  It is a user extension.
That makes infinitely more sense! ;-)  I was misled by the context - 
silly me.

> It works in 4.8 as far as the test program stackchk.exe goes.
I figured you'd say that...
>
> You are on the "BSP initialization stack" at this point in the program
> initialization.  I suspect you have blown your initialization stack
> or the RTEMS workspace and the BSP initialization stack overlap.
> Thus when the stack checker writes the pattern for the first
> created task, it destroys the stack you are running on.
>
> Does this make sense?
Sure, if that is indeed what is going on.  I'm not sure where to look on 
this, and I won't be able to check on it until Friday (FWIW - the only 
truly frustrating thing about my project is I only work 18-20 hours 
during two days a week, and I always seem to be finding problems at the 
end of one day, and I can't get back to it until several days later!)  
Anyway, I'll look into it then, and report back - until then, assume it 
is in my BSP...

Thanks!
-Bob
>>     Exception handling initialization done
>>     opb_intc_init: m
exception handler called for exception 7
>>          Next PC or Address of fault = A5A5A5A4
>>          Saved MSR = 0
>>          R0 = A5A5A5A5
>>          R1 = 4A7EB4
>>          R2 = 4853A8
>>          R3 = 1
>>          R4 = A5
>>          R5 = 0
>>          R6 = FEFFFFFF
>>          R7 = 490000
>>          R8 = 490AAC
>>          R9 = 4A9C78
>>          R10 = 1
>>          R11 = 4A9C78
>>          R12 = 0
>>          R13 = FFFEAAFC
>>          R14 = FFFFFFFF
>>          R15 = FFFFFFFF
>>          R16 = FFFFFFFF
>>          R17 = FFFFFFFF
>>          R18 = FFFFFFFF
>>          R19 = FFFFFFFF
>>          R20 = FFFFFFFF
>>          R21 = FFFE2E6C
>>          R22 = FFFE0000
>>          R23 = FFFE0000
>>          R24 = 0
>>          R25 = 490984
>>          R26 = 1
>>          R27 = 0
>>          R28 = 490000
>>          R29 = 490C2C
>>          R30 = 4A0F38
>>          R31 = A5A5A5A5
>>          CR = 28008022
>>          CTR = 0
>>          XER = 20000000
>>          LR = A5A5A5A5
>>          MSR = 0
>>          DAR = 0
>>     Stack Trace:
>>       IP: 0xA5A5A5A4, LR: 0xA5A5A5A5
>>     --^ 0x00000000
>>     unrecoverable exception!!! Push reset button
>>
>> Turning off the stack checker allows my application to proceed 
>> normally...
>>
>> Any ideas?  Thanks!
>> -Bob
>>
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>
>