#14211: Crash due to missing sig_on in Expression.__nonzero__
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Reporter: mjo | Owner: burcin
Type: defect | Status: new
Priority: critical | Milestone: sage-6.7
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: Reported upstream. Developers | Work issues:
deny it's a bug. | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by rws):
Replying to [comment:11 nbruin]:
> Are you sure this is the sole problem, though?
I have reopened the Pynac issue. The crash is in exactly the same call
tree. It happens while trying to multiply the rhs with `-1` to get `lhs-
rhs`. So:
{{{
sage: f(x)=matrix()
sage: bool(f(x)==1)
True
sage: bool(1==f(x))
<crash>
}}}
Also no, I don't think it's the sole problem. Either Sage or Pynac will
have to check somewhere before evaluating that all mutable Python objects
of the expression are switched to immutable (or make immutable copies).
--
Ticket URL: <http://trac.sagemath.org/ticket/14211#comment:12>
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