It looks like this problem is going to be fixed by the upgrade to Singular 
4.1.3 (#25993).

    sage: R.<x,y> = Integers(7)[]
    sage: p = x**2-1
    sage: p.factor()
    (x + 1) * (x + 6)

There is another segmentation fault related to the non-commutative 
subsystem Plural, though, causing a doctest failure on the upgrade branch. 
See https://trac.sagemath.org/ticket/25993#comment:22 for details. Any help 
with this is appreciated.

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