Opened 2 years ago

Closed 2 years ago

## #873 closed bug (fixed)

# Bug using polynomial ring as coefficient ring

Reported by: | anonymous | Owned by: | somebody |
---|---|---|---|

Priority: | minor | Milestone: | 4-2-1 and higher |

Component: | dontKnow | Version: | 4-2-0 |

Keywords: | Cc: |

### Description

Here is a minimal example: running the following code twice

ring F = 0,(a,b),dp; ring R = F,(c),dp; ideal I = c; std(I);

then use

ring F = 0,(a),dp;

leads to a segment fault. If the first part is only run once then the error will not happen.

SINGULAR / Development A Computer Algebra System for Polynomial Computations / version 4.2.0 0< by: W. Decker, G.-M. Greuel, G. Pfister, H. Schoenemann \ Dec 2020 FB Mathematik der Universitaet, D-67653 Kaiserslautern \ > ring F = 0,(a,b),dp; > ring R = F,(c),dp; > ideal I = c; > std(I); _[1]=c > ring F = 0,(a,b),dp; // ** redefining F (ring F = 0,(a,b),dp;) > ring R = F,(c),dp; // ** redefining R (ring R = F,(c),dp;) > ideal I = c; > std(I); _[1]=c > ring F = 0,(a),dp; // ** redefining F (ring F = 0,(a),dp;) Singular : signal 11 (v: 4202): current line:>>ring F = 0,(a),dp;<< Segment fault/Bus error occurred at 7fe2ee6fd030 because of 10202 (r:1619176513) please inform the authors trying to restart...

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fixed with 1f547ed4cc617ebefd435098637414a0fabd2084