Stack Checker in rtems-4.8.0 - is it broken?

[Robert S. Grimes]

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:

    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