Segment fault by wrong a-ordering with ringlist

[daniel.andres@…]

Dear Singular team,

when equipping a ring with an a-ordering using ringlist, one gets a segment fault when using more weights than variables present.

Here is an example.

ring r = 0,(x,y),(a(1..3),dp);
r; // no problem
//   characteristic : 0
//   number of vars : 2
//        block   1 : ordering a
//                  : names    x y
//                  : weights  1 2
//        block   2 : ordering dp
//                  : names    x y
//        block   3 : ordering C

list RL = ringlist(r);
RL[3][1] = list("a",1..3); // three weights for only two vars
def rr = ring(RL);
setring rr;

deg(x); // strange
// ==> 4
deg(y); // strange
// ==> 5

rr;
//   characteristic : 0
//   number of vars : 2
//        block   1 : ordering a
//                  : names    x ySingular : signal 11 (v: 3130/ 14130 ):
current line:>>rr;<<
Segment fault/Bus error occurred at 7f8962965310 because of 10202 (r:1307633446)
please inform the authors
trying to restart...

[hannes]

fixed with revision 14270