#5443: [with patch, needs review] Segfault in congruence subgroup element code
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Reporter: craigcitro | Owner: craigcitro
Type: defect | Status: new
Priority: blocker | Milestone: sage-3.4
Component: modular forms | Keywords:
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Comment(by craigcitro):
Ah, touche. Actually, in 3.2.3, I was getting a different crash (a
`SIGBUS` instead of a `SIGSEGV`) ...
In any event, I've written a much better fix now (I hope!). The underlying
problem was that there were two ways to create elements of congruence
subgroups whose underlying matrix was of type `Matrix_integer_dense`
instead of `Matrix_integer_2x2` (and, as I said, the latter sadly doesn't
yet derive from the former). Those came from places where `M2Z` was used
to create matrices; these have been replaced by calls to create objects of
the appropriate type. (I also had to add a wee bit of code so that
congruence subgroup elements could determine their underlying list.)
Hopefully this will fix the issues -- let me know if you run into anything
else!
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5443#comment:3>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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