Dear all,

in my revision work for finite fields from time to time I get Control
stack exhausted without finding the problem which causes it. (Same
computation in the unchanged current world computes correctly)

Two questions:

1. How can I modify in LISP the debugging to check whether one simply
has to change the behavoiur (debug level 2 ??)

2. How can I trace the in the debugging mode to find out the reason for
this error.

Thanks

Johannes


P.S: Have FriCAS 1.3.6 on SBCL 1.3.14 on a MacBook.



(6) -> G := FF(11,20)

   (6)  FiniteField(11,20)
                                                                                
         
Type: Type
(7) -> a : G := random()

   (7)
        19       18      17      16    15    14       13      12     
11      10       8      7      6
     2 α   + 10 α   + 7 α   + 3 α   + α   + α   + 10 α   + 9 α   + 4 α  
+ 7 α   + 10 α  + 4 α  + 5 α
   +
        5       4    3      2
     3 α  + 10 α  + α  + 5 α  + 9 α + 6
                                                                           
Type: FiniteField(11,20)
(8) -> discreteLog a
   Discrete logarithm tables initialized
INFO: Control stack guard page unprotected
Control stack guard page temporarily disabled: proceed with caution

   >> System error:
   Control stack exhausted (no more space for function call frames).
This is probably due to heavily nested or infinitely recursive function
calls, or a tail call that SBCL cannot or has not optimized away.

PROCEED WITH CAUTION.

-- 
Mit freundlichen Grüßen

Johannes Grabmeier

Prof. Dr. Johannes Grabmeier
Köckstraße 1, D-94469 Deggendorf
Tel. +49-(0)-991-2979584, Tel. +49-(0)-151-681-70756
Tel. +49-(0)-991-3615-141 (d),  Fax: +49-(0)-32224-192688

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