#20693: Sage crashes when computing newforms
---------------------------------+------------------------
Reporter: ehlen | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.3
Component: modular forms | Resolution:
Keywords: | Merged in:
Authors: Stephan Ehlen | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by ehlen):
Let me add something that might be helpful in finding the bug:
I get the same / a similar crash when doing the following, which is how I
discovered it in the first place.
It confirms what the crash looks like above, that the real bug lies
somewhere in the linear algebra and/or number field code.
{{{
sage: D=DirichletGroup(23)
sage: c=D.gen()^2
sage: M=ModularSymbols(c,6,sign=1)
sage: S=M.cuspidal_subspace().new_subspace()
sage: A=D[0]
sage: v = A.dual_eigenvector(names='a', lift=False)
}}}
And crash...
{{{
------------------------------------------------------------------------
0 signals.so 0x00000001067855c5 print_backtrace
+ 37
------------------------------------------------------------------------
Unhandled SIGABRT: An abort() occurred.
This probably occurred because a *compiled* module has a bug
in it and is not properly wrapped with sig_on(), sig_off().
Python will now terminate.
------------------------------------------------------------------------
[1] 7238 abort ~/Documents/math/devel/sage-git/sage
}}}
And let me also add that I tried a binary distribution of sage 7.1 on yet
another machine as well with the Newforms(...) function and got the same
crash.
--
Ticket URL: <http://trac.sagemath.org/ticket/20693#comment:2>
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