#16938: Sage debug version
-------------------------------------+-------------------------------------
       Reporter:  SimonKing          |        Owner:
           Type:  defect             |       Status:  needs_review
       Priority:  critical           |    Milestone:  sage-6.4
      Component:  build              |   Resolution:
       Keywords:  debug singular     |    Merged in:
  cygwin64                           |    Reviewers:  Jeroen Demeyer
        Authors:  Simon King,        |  Work issues:
  Volker Braun                       |       Commit:
Report Upstream:  Reported           |  53b73dbfaf33d8e28840d5b6ad91ce1bf941cffa
  upstream. No feedback yet.         |     Stopgaps:
         Branch:                     |
  u/jdemeyer/ticket/16938            |
   Dependencies:                     |
-------------------------------------+-------------------------------------

Comment (by SimonKing):

 So far there is one error, and it seems to be a serious problem, namely a
 segmentation fault:
 {{{
 sage -t src/sage/modular/modsym/space.py
 **********************************************************************
 File "src/sage/modular/modsym/space.py", line 930, in
 sage.modular.modsym.space.ModularSymbolsSpace._q_expansion_module
 Failed example:
     ModularSymbols(11, 2,
 base_ring=GF(4,'a')).cuspidal_submodule()._q_expansion_module(prec=4,
 algorithm="hecke")
 Exception raised:
     Traceback (most recent call last):
       File "/home/king/Sage/debug/sage/local/lib/python2.7/site-
 packages/sage/doctest/forker.py", line 486, in _run
         self.compile_and_execute(example, compiler, test.globs)
       File "/home/king/Sage/debug/sage/local/lib/python2.7/site-
 packages/sage/doctest/forker.py", line 849, in compile_and_execute
         exec(compiled, globs)
       File "<doctest
 sage.modular.modsym.space.ModularSymbolsSpace._q_expansion_module[0]>",
 line 1, in <module>
         ModularSymbols(Integer(11), Integer(2),
 
base_ring=GF(Integer(4),'a')).cuspidal_submodule()._q_expansion_module(prec=Integer(4),
 algorithm="hecke")
       File "/home/king/Sage/debug/sage/local/lib/python2.7/site-
 packages/sage/modular/modsym/ambient.py", line 1392, in cuspidal_submodule
         S = self.boundary_map().kernel()
       File "/home/king/Sage/debug/sage/local/lib/python2.7/site-
 packages/sage/modules/matrix_morphism.py", line 649, in kernel
         V = self.matrix().kernel()
       File "sage/matrix/matrix2.pyx", line 3755, in
 sage.matrix.matrix2.Matrix.left_kernel
 (build/cythonized/sage/matrix/matrix2.c:23920)
       File "sage/matrix/matrix2.pyx", line 3596, in
 sage.matrix.matrix2.Matrix.right_kernel
 (build/cythonized/sage/matrix/matrix2.c:23371)
       File "sage/matrix/matrix2.pyx", line 3244, in
 sage.matrix.matrix2.Matrix.right_kernel_matrix
 (build/cythonized/sage/matrix/matrix2.c:22751)
       File "sage/matrix/matrix2.pyx", line 6119, in
 sage.matrix.matrix2.Matrix.echelon_form
 (build/cythonized/sage/matrix/matrix2.c:42445)
       File "sage/matrix/matrix_mod2e_dense.pyx", line 946, in
 sage.matrix.matrix_mod2e_dense.Matrix_mod2e_dense.echelonize
 (build/cythonized/sage/matrix/matrix_mod2e_dense.c:7938)
       File "sage/ext/c_lib.pyx", line 97, in
 sage.ext.c_lib.sig_raise_exception
 (build/cythonized/sage/ext/c_lib.c:1168)
     SignalError: Segmentation fault
 **********************************************************************
 1 item had failures:
    1 of   3 in
 sage.modular.modsym.space.ModularSymbolsSpace._q_expansion_module
     [313 tests, 1 failure, 43.51 s]
 }}}

--
Ticket URL: <http://trac.sagemath.org/ticket/16938#comment:82>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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