Crash with finduni

[gorzel]

If I try the example of finduni, ​http://www.singular.uni-kl.de/Manual/latest/sing_203.htm#SEC244 as indicated in the manual,

  ring  r=0,(x,y,z), dp;
  ideal i=y3+x2,x2y+x2,z4-x2-y;
  option(redSB);  // force computation of reduced basis
  i=std(i);
  ideal k=finduni(i);
  print(k);

then it works:

x4-x2,
y4+y3,
z12

But if I call directly finduni(std(i)); then Singular crashes.

> finduni(std(i));
Singular : signal 11 (v: 3111/2010062506):
current line:>>finduni(std(i));<<
Segment fault/Bus error occurred at 2b3faa073350 because of 10246 (r:1277992351)
please inform the authors
trying to restart...

What about constant input? May be it is related to Ticket #230

See the following

>  ring  r=0,(x,y,z), dp;
> ideal I;
> I =std(I);    // zero ideal 
> finduni(I);
_[1]=1          // should this be 1 ?
> finduni(1);
// ** _ is no standard basis
Singular : signal 11 (v: 3111/2010062506):
current line:>>finduni(1);<<
Segment fault/Bus error occurred at 2ac4c51e1890 because of 10246 (r:1277992463)
please inform the authors
trying to restart...
> finduni(0);       
// ** _ is no standard basis  // OK, since attrib("isSB") not set
Speicherzugriffsfehler