I'm finding that "sandpiles.py" often fails for me for varous reasons while
doing `make ptest`. Testing the file individually or via `sage -tp
src/sage/sandpiles` (i.e., just the relevant directory) seems fine.
The errors I have received up to now are "Timed out (2 times)"
---
File "src/sage/sandpiles/sandpile.py", line 4684, in
sage.sandpiles.sandpile.complete_sandpile
Failed example:
K.betti(verbose=False)
...
File "multi_polynomial_libsingular.pyx", line 912, in
sage.rings.polynomial.multi_polynomial_libsingular.MPolynomialRing_libsingular.__call__
(sage/rings/polynomial/multi_polynomial_libsingular.cpp:7912)
TypeError: Could not find a mapping of the passed element to this ring.
---
(same place but different error:)
File "multi_polynomial_libsingular.pyx", line 807, in
sage.rings.polynomial.multi_polynomial_libsingular.MPolynomialRing_libsingular.__call__
(sage/rings/polynomial/multi_polynomial_libsingular.cpp:6207)
File
"/usr/local/sage/sage-dev/local/lib/python2.7/site-packages/sage/interfaces/singular.py",
line 1245, in __repr__
elif self.type() == 'matrix':
File
"/usr/local/sage/sage-dev/local/lib/python2.7/site-packages/sage/interfaces/singular.py",
line 1976, in type
return m.group(1)
AttributeError: 'NoneType' object has no attribute 'group'
---
I ran into this issue while trying to see if I can be of help to #10963, so
some of the failures above were with the branch there (but the errors seem
unrelated to that, since failures and timeouts have happened on both). This
is on Fedora 19, Intel i7. I figured this would be a good release to hunt
for heisenbugs.
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