Re: [sage-release] Sage 8.7.beta5 released

[kcrisman]

Thanks, that is helpful - and a different error than what I got.  I gave 
the gist of this to the relevant sage-devel thread, thank you!
 

> >> 
> >> Justin, just to try for another data point for 
> https://groups.google.com/forum/#!topic/sage-devel/pNvpzOH4e1Q could you 
> try running the optional internet tests as well for this one?  Just running 
> --optional=sage,internet on one file, e.g. src/sage/databases/oeis.py 
> should suffice to test this out.  Thanks! 
> > 
> > Did that, with attached results (146 failures).  Why would “https” be an 
> unknown URL type. 
> > 
> > I ran this on two of the systems: 10.11.6 (MBP) and 10.13.6 (iMac Pro). 
>
> And the results: same failures (as in the now-attached log).  Too much 
> coffee, I suspect. 
>
>

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Re: [sage-release] Sage 8.7.beta5 released

['Justin C. Walker' via sage-release]

> On Mar 14, 2019, at 13:40 , kcrisman  wrote:
> 
> Justin, just to try for another data point for 
> https://groups.google.com/forum/#!topic/sage-devel/pNvpzOH4e1Q could you try 
> running the optional internet tests as well for this one?  Just running 
> --optional=sage,internet on one file, e.g. src/sage/databases/oeis.py should 
> suffice to test this out.  Thanks!

Did that, with attached results (146 failures).  Why would “https” be an 
unknown URL type.

I ran this on two of the systems: 10.11.6 (MBP) and 10.13.6 (iMac Pro).

HTH

--
Justin C. Walker, Curmudgeon-at-Large
() The ASCII Ribbon Campaign
/\ Help Cure HTML Email



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Re: [sage-release] Sage 8.7.beta5 released

[kcrisman]

Justin, just to try for another data point 
for https://groups.google.com/forum/#!topic/sage-devel/pNvpzOH4e1Q could 
you try running the optional internet tests as well for this one?  Just 
running --optional=sage,internet on one file, 
e.g. src/sage/databases/oeis.py should suffice to test this out.  Thanks!


>
> Built w/o problems on three macOS platforms from a fresh clone of the 
> develop tree. 
>
> 10.11.6 (mid-2015 MBP, Quad-core Core i7): all tests passed! 
>
> 10.13.6 (2017 iMac Pro, 18-core Xeon W): all tests passed! 
> However, repeating the “loop” testing of polynomials.pyx showed the same 
> intermittent failures as before (this failure occurred in 4 of 8 tests). 
>
> 10.14.2 (2017 MBP, Quad-core Core i7): one testing failure: 
> sage -t --long --warn-long 77.8 
> src/sage/numerical/backends/logging_backend.py  # Killed due to abort 
>

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Re: [sage-release] Sage 8.7.beta5 released

[E. Madison Bray]

On Mon, Feb 25, 2019 at 4:04 PM Vincent Delecroix
<20100.delecr...@gmail.com> wrote:
>
> I can not reproduce the error. What is the configuration of
> your machine?
>
> The comparison routine in QQbar that is called
> (cmp_elements_with_same_minpoly) assumes that the elements
> a and b have the same minimal polynomial p. But the error message
> is weird as it does not seem to be the case.  The only roots of p
> that looks like a and b are the following pair of conjugates
>
>   2.917983368234029?e15 - 1.630474617080222?e18*I
>   2.917983368234029?e15 + 1.630474617080222?e18*I
>
> But the imaginary part is non-trivial! It seems that a and b
> that appears in the error are here the *real part* of some roots
> but not roots.
>
> It would be helpful if you could provide more data (ie via pdb or
> adding prints in qqbar.py). More precisely at lines 3367 (qqbar.py)
> the values and types of
>   * sd._left._descr
>   * sd._right._descr
>   * sd._op
> and also at lines 3372 the values of the polynomials
>   * lp
>   * rp
>
> (the datatype of an element in QQbar is mostly a tree and
> in the current situation sd._left and sd._right are the
> two subtrees)
>
> Ideally, it should be possible to reconstruct the element that
> triggers the error... you can try to print a sage_input(self)
> in the __bool__ method (line 3367).


Thank you for taking the time to look into this, and I apologize for
that because I just found that it was a false alarm: I apparently
somehow (despite just having rebuilt it) wound up with a
partially-broken PARI, at least I think.  After a manual `rm -f
local/lib/*pari*` and rebuilding pari, cypari, and their dependents
everything is fixed now.

Of course, that could indicate a bug in the build system, but I'm not
sure now how I would reproduce the situation.  This arose in part
because I was playing around with
https://trac.sagemath.org/ticket/27267



> Le 25/02/2019 à 15:39, E. Madison Bray a écrit :
> > On Mon, Feb 25, 2019 at 3:36 PM E. Madison Bray  
> > wrote:
> >>
> >> On Ubuntu 14.04 I am getting a strange error when trying to build the
> >> docs.  Tried `make doc-clean` to no avail:
> >
> > Also, when I try running the tests for
> > sage.categories.finite_coxeter_groups I get the same failure at:
> >
> > sage -t src/sage/categories/finite_coxeter_groups.py
> > **
> > File "src/sage/categories/finite_coxeter_groups.py", line 725, in
> > sage.categories.finite_coxeter_groups.FiniteCoxeterGroups.ParentMethods.permutahedron
> > Failed example:
> >  W.permutahedron()
> >
> > Followed with a long traceback, the relevant portion being:
> >
> >  W.permutahedron()
> >File 
> > "/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/categories/finite_coxeter_groups.py",
> > line 765, in permutahedron
> >  return Polyhedron(vertices=vertices, base_ring=base_ring)
> >File 
> > "/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/constructor.py",
> > line 600, in Polyhedron
> >  return parent(Vrep, Hrep, convert=convert, verbose=verbose)
> >File "sage/structure/parent.pyx", line 901, in
> > sage.structure.parent.Parent.__call__
> > (build/cythonized/sage/structure/parent.c:9205)
> >  return mor._call_with_args(x, args, kwds)
> >File "sage/structure/coerce_maps.pyx", line 181, in
> > sage.structure.coerce_maps.DefaultConvertMap_unique._call_with_args
> > (build/cythonized/sage/structure/coerce_maps.c:5076)
> >  raise
> >File "sage/structure/coerce_maps.pyx", line 176, in
> > sage.structure.coerce_maps.DefaultConvertMap_unique._call_with_args
> > (build/cythonized/sage/structure/coerce_maps.c:4964)
> >  return C._element_constructor(x, *args, **kwds)
> >File 
> > "/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/parent.py",
> > line 517, in _element_constructor_
> >  return self.element_class(self, Vrep, Hrep, **kwds)
> >File 
> > "/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/backend_field.py",
> > line 177, in __init__
> >  super(Polyhedron_field, self).__init__(parent, Vrep, Hrep, **kwds)
> >File 
> > "/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/base.py",
> > line 124, in __init__
> >  self._init_from_Vrepresentation(vertices, rays, lines, **kwds)
> >File 
> > "/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/backend_field.py",
> > line 208, in _init_from_Vrepresentation
> >  H = Vrep2Hrep(self.base_ring(), self.ambient_dim(), vertices,
> > rays, lines)
> >File 
> > "/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description_inhomogeneous.py",
> > line 446, in __init__
> >  DD = 

Re: [sage-release] Sage 8.7.beta5 released

[Vincent Delecroix]

I can not reproduce the error. What is the configuration of
your machine?

The comparison routine in QQbar that is called
(cmp_elements_with_same_minpoly) assumes that the elements
a and b have the same minimal polynomial p. But the error message
is weird as it does not seem to be the case.  The only roots of p
that looks like a and b are the following pair of conjugates

 2.917983368234029?e15 - 1.630474617080222?e18*I
 2.917983368234029?e15 + 1.630474617080222?e18*I

But the imaginary part is non-trivial! It seems that a and b
that appears in the error are here the *real part* of some roots
but not roots.

It would be helpful if you could provide more data (ie via pdb or
adding prints in qqbar.py). More precisely at lines 3367 (qqbar.py)
the values and types of
 * sd._left._descr
 * sd._right._descr
 * sd._op
and also at lines 3372 the values of the polynomials
 * lp
 * rp

(the datatype of an element in QQbar is mostly a tree and
in the current situation sd._left and sd._right are the
two subtrees)

Ideally, it should be possible to reconstruct the element that
triggers the error... you can try to print a sage_input(self)
in the __bool__ method (line 3367).

Vincent

Le 25/02/2019 à 15:39, E. Madison Bray a écrit :

On Mon, Feb 25, 2019 at 3:36 PM E. Madison Bray  wrote:


On Ubuntu 14.04 I am getting a strange error when trying to build the
docs.  Tried `make doc-clean` to no avail:


Also, when I try running the tests for
sage.categories.finite_coxeter_groups I get the same failure at:

sage -t src/sage/categories/finite_coxeter_groups.py
**
File "src/sage/categories/finite_coxeter_groups.py", line 725, in
sage.categories.finite_coxeter_groups.FiniteCoxeterGroups.ParentMethods.permutahedron
Failed example:
 W.permutahedron()

Followed with a long traceback, the relevant portion being:

 W.permutahedron()
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/categories/finite_coxeter_groups.py",
line 765, in permutahedron
 return Polyhedron(vertices=vertices, base_ring=base_ring)
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/constructor.py",
line 600, in Polyhedron
 return parent(Vrep, Hrep, convert=convert, verbose=verbose)
   File "sage/structure/parent.pyx", line 901, in
sage.structure.parent.Parent.__call__
(build/cythonized/sage/structure/parent.c:9205)
 return mor._call_with_args(x, args, kwds)
   File "sage/structure/coerce_maps.pyx", line 181, in
sage.structure.coerce_maps.DefaultConvertMap_unique._call_with_args
(build/cythonized/sage/structure/coerce_maps.c:5076)
 raise
   File "sage/structure/coerce_maps.pyx", line 176, in
sage.structure.coerce_maps.DefaultConvertMap_unique._call_with_args
(build/cythonized/sage/structure/coerce_maps.c:4964)
 return C._element_constructor(x, *args, **kwds)
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/parent.py",
line 517, in _element_constructor_
 return self.element_class(self, Vrep, Hrep, **kwds)
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/backend_field.py",
line 177, in __init__
 super(Polyhedron_field, self).__init__(parent, Vrep, Hrep, **kwds)
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/base.py",
line 124, in __init__
 self._init_from_Vrepresentation(vertices, rays, lines, **kwds)
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/backend_field.py",
line 208, in _init_from_Vrepresentation
 H = Vrep2Hrep(self.base_ring(), self.ambient_dim(), vertices,
rays, lines)
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description_inhomogeneous.py",
line 446, in __init__
 DD = Algorithm(A).run()
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 764, in run
 DD.add_inequality(a)
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 715, in add_inequality
 if not self.are_adjacent(rp, rn):
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 447, in are_adjacent
 Z = self.zero_set(r1).intersection(self.zero_set(r2))
   File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 375, in zero_set
 t.update(self.A[i] for i in range(n,len(self.A)) if
self.A[i].inner_product(ray) == self.zero)
   File 

Re: [sage-release] Sage 8.7.beta5 released

[E. Madison Bray]

On Mon, Feb 25, 2019 at 3:36 PM E. Madison Bray  wrote:
>
> On Ubuntu 14.04 I am getting a strange error when trying to build the
> docs.  Tried `make doc-clean` to no avail:

Also, when I try running the tests for
sage.categories.finite_coxeter_groups I get the same failure at:

sage -t src/sage/categories/finite_coxeter_groups.py
**
File "src/sage/categories/finite_coxeter_groups.py", line 725, in
sage.categories.finite_coxeter_groups.FiniteCoxeterGroups.ParentMethods.permutahedron
Failed example:
W.permutahedron()

Followed with a long traceback, the relevant portion being:

W.permutahedron()
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/categories/finite_coxeter_groups.py",
line 765, in permutahedron
return Polyhedron(vertices=vertices, base_ring=base_ring)
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/constructor.py",
line 600, in Polyhedron
return parent(Vrep, Hrep, convert=convert, verbose=verbose)
  File "sage/structure/parent.pyx", line 901, in
sage.structure.parent.Parent.__call__
(build/cythonized/sage/structure/parent.c:9205)
return mor._call_with_args(x, args, kwds)
  File "sage/structure/coerce_maps.pyx", line 181, in
sage.structure.coerce_maps.DefaultConvertMap_unique._call_with_args
(build/cythonized/sage/structure/coerce_maps.c:5076)
raise
  File "sage/structure/coerce_maps.pyx", line 176, in
sage.structure.coerce_maps.DefaultConvertMap_unique._call_with_args
(build/cythonized/sage/structure/coerce_maps.c:4964)
return C._element_constructor(x, *args, **kwds)
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/parent.py",
line 517, in _element_constructor_
return self.element_class(self, Vrep, Hrep, **kwds)
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/backend_field.py",
line 177, in __init__
super(Polyhedron_field, self).__init__(parent, Vrep, Hrep, **kwds)
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/base.py",
line 124, in __init__
self._init_from_Vrepresentation(vertices, rays, lines, **kwds)
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/backend_field.py",
line 208, in _init_from_Vrepresentation
H = Vrep2Hrep(self.base_ring(), self.ambient_dim(), vertices,
rays, lines)
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description_inhomogeneous.py",
line 446, in __init__
DD = Algorithm(A).run()
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 764, in run
DD.add_inequality(a)
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 715, in add_inequality
if not self.are_adjacent(rp, rn):
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 447, in are_adjacent
Z = self.zero_set(r1).intersection(self.zero_set(r2))
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 375, in zero_set
t.update(self.A[i] for i in range(n,len(self.A)) if
self.A[i].inner_product(ray) == self.zero)
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 375, in 
t.update(self.A[i] for i in range(n,len(self.A)) if
self.A[i].inner_product(ray) == self.zero)
  File "sage/structure/element.pyx", line 1091, in
sage.structure.element.Element.__richcmp__
(build/cythonized/sage/structure/element.c:9923)
return (self)._richcmp_(other, op)
  File "sage/structure/element.pyx", line 1095, in
sage.structure.element.Element._richcmp_
(build/cythonized/sage/structure/element.c:10030)
cpdef _richcmp_(left, right, int op):
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/rings/qqbar.py",
line 4641, in _richcmp_
return bool(self) == (op == op_NE)
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/rings/qqbar.py",
line 3376, in __bool__
c = cmp_elements_with_same_minpoly(left, right, left.minpoly())
  File 
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/rings/qqbar.py",
line 2225, in cmp_elements_with_same_minpoly
raise RuntimeError('a = {}\nb = {}\np = {}'.format(a, b, p))
RuntimeError: a = 2.917983368234029?e15
b = 2.917983368234029?e15
p = x^6 - 5835966736468056*x^5 +
2658455991569831813923974927379870544*x^4 +

Re: [sage-release] Sage 8.7.beta5 released

[E. Madison Bray]

On Ubuntu 14.04 I am getting a strange error when trying to build the
docs.  Tried `make doc-clean` to no avail:

[dochtml] [categorie]
/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/categories/finite_coxeter_groups.py:docstring
of 
sage.categories.finite_coxeter_groups.FiniteCoxeterGroups.ParentMethods.permutahedron:50:
WARNING: Exception occurred in plotting finite_coxeter_groups-1
[dochtml] [categorie]  from
/home/embray/src/sagemath/sage/src/doc/en/reference/categories/sage/categories/finite_coxeter_groups.rst:
[dochtml] [categorie] Traceback (most recent call last):
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/matplotlib/sphinxext/plot_directive.py",
line 524, in run_code
[dochtml] [categorie] six.exec_(code, ns)
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/six.py",
line 709, in exec_
[dochtml] [categorie] exec("""exec _code_ in _globs_, _locs_""")
[dochtml] [categorie]   File "", line 1, in 
[dochtml] [categorie]   File "", line 2, in 
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/categories/finite_coxeter_groups.py",
line 765, in permutahedron
[dochtml] [categorie] return Polyhedron(vertices=vertices,
base_ring=base_ring)
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/constructor.py",
line 600, in Polyhedron
[dochtml] [categorie] return parent(Vrep, Hrep, convert=convert,
verbose=verbose)
[dochtml] [categorie]   File "sage/structure/parent.pyx", line 901, in
sage.structure.parent.Parent.__call__
(build/cythonized/sage/structure/parent.c:9205)
[dochtml] [categorie] return mor._call_with_args(x, args, kwds)
[dochtml] [categorie]   File "sage/structure/coerce_maps.pyx", line
181, in sage.structure.coerce_maps.DefaultConvertMap_unique._call_with_args
(build/cythonized/sage/structure/coerce_maps.c:5076)
[dochtml] [categorie] raise
[dochtml] [categorie]   File "sage/structure/coerce_maps.pyx", line
176, in sage.structure.coerce_maps.DefaultConvertMap_unique._call_with_args
(build/cythonized/sage/structure/coerce_maps.c:4964)
[dochtml] [categorie] return C._element_constructor(x, *args, **kwds)
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/parent.py",
line 517, in _element_constructor_
[dochtml] [categorie] return self.element_class(self, Vrep, Hrep, **kwds)
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/backend_field.py",
line 177, in __init__
[dochtml] [categorie] super(Polyhedron_field,
self).__init__(parent, Vrep, Hrep, **kwds)
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/base.py",
line 124, in __init__
[dochtml] [categorie] self._init_from_Vrepresentation(vertices,
rays, lines, **kwds)
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/backend_field.py",
line 208, in _init_from_Vrepresentation
[dochtml] [categorie] H = Vrep2Hrep(self.base_ring(),
self.ambient_dim(), vertices, rays, lines)
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description_inhomogeneous.py",
line 446, in __init__
[dochtml] [categorie] DD = Algorithm(A).run()
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 764, in run
[dochtml] [categorie] DD.add_inequality(a)
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 715, in add_inequality
[dochtml] [categorie] if not self.are_adjacent(rp, rn):
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 447, in are_adjacent
[dochtml] [categorie] Z = self.zero_set(r1).intersection(self.zero_set(r2))
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 375, in zero_set
[dochtml] [categorie] t.update(self.A[i] for i in
range(n,len(self.A)) if self.A[i].inner_product(ray) == self.zero)
[dochtml] [categorie]   File
"/home/embray/src/sagemath/sage/local/lib/python2.7/site-packages/sage/geometry/polyhedron/double_description.py",
line 375, in 
[dochtml] [categorie] t.update(self.A[i] for i in
range(n,len(self.A)) if self.A[i].inner_product(ray) == self.zero)
[dochtml] [categorie]   File "sage/structure/element.pyx", line 1091,
in sage.structure.element.Element.__richcmp__
(build/cythonized/sage/structure/element.c:9923)
[dochtml] 

Re: [sage-release] Sage 8.7.beta5 released

['Justin C. Walker' via sage-release]

> On Feb 24, 2019, at 02:39 , Volker Braun  wrote:
> 
> As always, you can get the latest beta version from the "develop" git branch. 
> Alternatively, the self-contained source tarball is at 
> http://www.sagemath.org/download-latest.html

Built w/o problems on three macOS platforms from a fresh clone of the develop 
tree.

10.11.6 (mid-2015 MBP, Quad-core Core i7): all tests passed!

10.13.6 (2017 iMac Pro, 18-core Xeon W): all tests passed!
However, repeating the “loop” testing of polynomials.pyx showed the same 
intermittent failures as before (this failure occurred in 4 of 8 tests).

10.14.2 (2017 MBP, Quad-core Core i7): one testing failure:
sage -t --long --warn-long 77.8 src/sage/numerical/backends/logging_backend.py  
# Killed due to abort

When run by itself the test passed.  I then reran the full test cycle, with no 
failures (other than a batch of timeouts, due to my being unable to keep my MBP 
from going to sleep at intervals).

Log for the logging_bsckend failure attached.

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sage -t --long --warn-long 77.8 src/sage/numerical/backends/logging_backend.py
Killed due to abort
**
Tests run before process (pid=64855) failed:
sage: from sage.numerical.backends.logging_backend import _format_function_call 
## line 30 ##
sage: _format_function_call('foo', 17, hello='goodby') ## line 31 ##
"foo(17, hello='goodby')"
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 33 ##
0
sage: from sage.numerical.backends.generic_backend import get_solver ## line 45 
##
sage: from sage.numerical.backends.logging_backend import _make_wrapper, 
LoggingBackend ## line 46 ##
sage: backend = get_solver(solver='GLPK') ## line 47 ##
sage: w = _make_wrapper(backend, 'ncols') ## line 48 ##
sage: logging_backend = LoggingBackend(backend) ## line 49 ##
sage: w(logging_backend) ## line 50 ##
# p.ncols()
# result: 0
0
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 54 ##
0
sage: import sage.numerical.backends.logging_backend ## line 101 ##
sage: from sage.numerical.backends.logging_backend import LoggingBackend ## 
line 102 ##
sage: from sage.numerical.backends.generic_backend import get_solver ## line 
103 ##
sage: b = get_solver(solver = "GLPK") ## line 104 ##
sage: lb = LoggingBackend(backend=b) ## line 105 ##
sage: lb.add_variable(obj=42, name='Helloo') ## line 106 ##
# p.add_variable(obj=42, name='Helloo')
# result: 0
0
sage: lb.add_variable(obj=1789) ## line 110 ##
# p.add_variable(obj=1789)
# result: 1
1
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 116 
##
0
sage: import sage.numerical.backends.logging_backend ## line 125 ##
sage: from sage.numerical.backends.logging_backend import LoggingBackend ## 
line 126 ##
sage: from sage.numerical.backends.generic_backend import get_solver ## line 
127 ##
sage: b = get_solver(solver = "GLPK") ## line 128 ##
sage: lb = LoggingBackend(backend=b) ## line 129 ##
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 130 
##
0
sage: import sage.numerical.backends.logging_backend ## line 147 ##
sage: from sage.numerical.backends.logging_backend import LoggingBackend ## 
line 148 ##
sage: from sage.numerical.backends.generic_backend import get_solver ## line 
149 ##
sage: b = get_solver(solver = "GLPK") ## line 150 ##
sage: lb = LoggingBackend(backend=b) ## line 151 ##
sage: lb.print_ranges ## line 152 ##
>
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 154 
##
0
sage: import sage.numerical.backends.logging_backend ## line 180 ##
sage: from sage.numerical.backends.logging_backend import LoggingBackend ## 
line 181 ##
sage: from sage.numerical.backends.generic_backend import get_solver ## line 
182 ##
sage: b = get_solver(solver = "GLPK") ## line 183 ##
sage: lb = LoggingBackend(backend=b) ## line 184 ##
sage: lb.base_ring() ## line 185 ##
Real Double Field
sage: from sage.rings.all import QQ ## line 187 ##
sage: lb = LoggingBackend(backend=b, base_ring=QQ) ## line 188 ##
sage: lb.base_ring() ## line 189 ##
Rational Field
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 191 
##
0
sage: def compute_something(solver='GLPK'):
from sage.numerical.mip import MIPSolverException
mip = MixedIntegerLinearProgram(solver=solver)
lb = mip.get_backend()
lb.add_variable(obj=42, name='Helloo')
lb.add_variable(obj=1789)
try:
lb.solve()
except MIPSolverException:
return 4711
else: