#12188: Bug in is_smooth for curves over CC
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Reporter: johanbosman | Owner: AlexGhitza
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-5.11
Component: algebraic geometry | Resolution:
Keywords: singular | Merged in:
Authors: Peter Bruin | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Dependencies:
Stopgaps: |
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Changes (by {'newvalue': u'Peter Bruin', 'oldvalue': ''}):
* status: new => needs_review
* author: => Peter Bruin
Old description:
> {{{
> sage: P.<X,Y,Z> = CC[]
> sage: C = Curve(X)
> sage: C.is_smooth()
> singular_ring_delete(ring*) called with NULL pointer.
> ...
> Exception KeyError: (The ring pointer 0x0,) in
> 'sage.libs.singular.ring.singular_ring_delete' ignored
> True
> }}}
New description:
{{{
sage: P.<X,Y,Z> = CC[]
sage: C = Curve(X)
sage: C.is_smooth()
singular_ring_delete(ring*) called with NULL pointer.
...
Exception KeyError: (The ring pointer 0x0,) in
'sage.libs.singular.ring.singular_ring_delete' ignored
True
}}}
The cause is that if `GroebnerStrategy.__cinit__()` raises an exception,
its `__dealloc__` method is still called. Therefore `__dealloc__()`
should only delete things that were actually constructed before the
exception occurred.
Apply: [attachment:trac_12188-singular_null_pointer.patch]
--
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Ticket URL: <http://trac.sagemath.org/ticket/12188#comment:6>
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