FWIW, on Debian testing running on core i7 + 16 GB RAM, a Python3 upgrade 
from 8.9beta4 gives me 3 failures, all permanent:


----------------------------------------------------------------------
sage -t --long --warn-long 158.3 src/sage/graphs/strongly_regular_db.pyx  # 
4 doctests failed
sage -t --long --warn-long 158.3 
src/sage/algebras/quantum_groups/quantum_group_gap.py  # Killed due to 
segmentation fault
sage -t --long --warn-long 158.3 
src/sage/rings/polynomial/polynomial_rational_flint.pyx  # 1 doctest failed
----------------------------------------------------------------------

Thr third one has already been reported , and I'm aware of a relevant 
ticket been worked on. OFAICT, the first two are novel.

Details:

charpent@zen-book-flip:/usr/local/sage-P3$ sage -t --long --warn-long 158.3 
src/sage/graphs/strongly_regular_db.pyx
Running doctests with ID 2019-08-12-15-28-19-15c539ce.
Git branch: develop
Using 
--optional=build,dochtml,dot2tex,fricas,gap_packages,giacpy_sage,libsemigroups,memlimit,mpir,python2,sage
Doctesting 1 file.
sage -t --long --warn-long 158.3 src/sage/graphs/strongly_regular_db.pyx
**********************************************************************
File "src/sage/graphs/strongly_regular_db.pyx", line 2323, in 
sage.graphs.strongly_regular_db.SRG_280_135_70_60
Failed example:
    g=SRG_280_135_70_60()                  # long time # optional - 
gap_packages
Exception raised:
    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/gap.py", 
line 763, in _eval_line
        raise RuntimeError("%s produced error output\n%s\n   executing 
%s"%(self, error,line))
    RuntimeError: Gap produced error output
    Error, Record Element: <rec> must be a record (not a boolean or fail)

       executing \$sage11:=AtlasGenerators("J2",2).generators;;

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/expect.py",
 
line 1438, in __init__
        self._name = parent._create(value, name=name)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/interface.py",
 
line 491, in _create
        self.set(name, value)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/gap.py", 
line 1414, in set
        self._eval_line(cmd, allow_use_file=True)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/gap.py", 
line 790, in _eval_line
        raise RuntimeError(message)
    RuntimeError: Gap produced error output
    Error, Record Element: <rec> must be a record (not a boolean or fail)

       executing \$sage11:=AtlasGenerators("J2",2).generators;;

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1105, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.graphs.strongly_regular_db.SRG_280_135_70_60[1]>", line 1, in <module>
        g=SRG_280_135_70_60()                  # long time # optional - 
gap_packages
      File "sage/graphs/strongly_regular_db.pyx", line 2334, in 
sage.graphs.strongly_regular_db.SRG_280_135_70_60 
(build/cythonized/sage/graphs/strongly_regular_db.c:34133)
        J2    = PermutationGroup(gap('AtlasGenerators("J2",2).generators'))
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/interface.py",
 
line 288, in __call__
        return cls(self, x, name=name)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/expect.py",
 
line 1443, in __init__
        raise_(TypeError, TypeError(*x.args), sys.exc_info()[2])
      File "/usr/local/sage-P3/local/lib/python3.7/site-packages/six.py", 
line 692, in reraise
        raise value.with_traceback(tb)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/expect.py",
 
line 1438, in __init__
        self._name = parent._create(value, name=name)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/interface.py",
 
line 491, in _create
        self.set(name, value)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/gap.py", 
line 1414, in set
        self._eval_line(cmd, allow_use_file=True)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/interfaces/gap.py", 
line 790, in _eval_line
        raise RuntimeError(message)
    TypeError: Gap produced error output
    Error, Record Element: <rec> must be a record (not a boolean or fail)

       executing \$sage11:=AtlasGenerators("J2",2).generators;;
**********************************************************************
File "src/sage/graphs/strongly_regular_db.pyx", line 2324, in 
sage.graphs.strongly_regular_db.SRG_280_135_70_60
Failed example:
    g.is_strongly_regular(parameters=True) # long time # optional - 
gap_packages
Exception raised:
    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1105, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.graphs.strongly_regular_db.SRG_280_135_70_60[2]>", line 1, in <module>
        g.is_strongly_regular(parameters=True) # long time # optional - 
gap_packages
    NameError: name 'g' is not defined
**********************************************************************
File "src/sage/graphs/strongly_regular_db.pyx", line 2450, in 
sage.graphs.strongly_regular_db.SRG_416_100_36_20
Failed example:
    g = SRG_416_100_36_20()                # optional - gap_packages # long 
time
Exception raised:
    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1105, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.graphs.strongly_regular_db.SRG_416_100_36_20[1]>", line 1, in <module>
        g = SRG_416_100_36_20()                # optional - gap_packages # 
long time
      File "sage/graphs/strongly_regular_db.pyx", line 2460, in 
sage.graphs.strongly_regular_db.SRG_416_100_36_20 
(build/cythonized/sage/graphs/strongly_regular_db.c:36293)
        h.add_edges(g.Orbit([1,5],libgap.OnSets))
      File "sage/libs/gap/element.pyx", line 2619, in 
sage.libs.gap.element.GapElement_MethodProxy.__call__ 
(build/cythonized/sage/libs/gap/element.c:19709)
        return GapElement_Function.__call__(self, * ([self.first_argument] 
+ list(args)))
      File "sage/libs/gap/element.pyx", line 2467, in 
sage.libs.gap.element.GapElement_Function.__call__ 
(build/cythonized/sage/libs/gap/element.c:18722)
        sig_on()
    sage.libs.gap.util.GAPError: Syntax warning: Unbound global variable in 
stream:8
            z:=Z(q^2); e:=z; sqo:=(q^2-1)/2;
                                ^^
    Syntax warning: Unbound global variable in stream:9
            if IsInt(sqo/Order(e^2+z^0)) then
                        ^
    Syntax warning: Unbound global variable in stream:10
                e:=z^First([2..q^2-2], x-> not 
IsInt(sqo/Order(z^(2*x)+z^0)));
                                                        ^
    Syntax warning: Unbound global variable in stream:21
            G:=Graph(G1,Concatenation(O1,O2),OnSets,
                    ^
    Syntax warning: Unbound global variable in stream:23
            return List([1..OrderGraph(G)],x->Adjacency(G,x));
                                      ^
    Syntax warning: Unbound global variable in stream:23
            return List([1..OrderGraph(G)],x->Adjacency(G,x));
                                                       ^
    Error, no method found! Error, no 1st choice method found for 
`GeneratorsOfMagmaWithInverses' on 1 arguments
    The 1st argument is 'fail' which might point to an earlier problem
**********************************************************************
File "src/sage/graphs/strongly_regular_db.pyx", line 2451, in 
sage.graphs.strongly_regular_db.SRG_416_100_36_20
Failed example:
    g.is_strongly_regular(parameters=True) # optional - gap_packages # long 
time
Exception raised:
    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1105, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.graphs.strongly_regular_db.SRG_416_100_36_20[2]>", line 1, in <module>
        g.is_strongly_regular(parameters=True) # optional - gap_packages # 
long time
    NameError: name 'g' is not defined
**********************************************************************
2 items had failures:
   2 of   4 in sage.graphs.strongly_regular_db.SRG_280_135_70_60
   2 of   4 in sage.graphs.strongly_regular_db.SRG_416_100_36_20
    [334 tests, 4 failures, 811.86 s]
----------------------------------------------------------------------
sage -t --long --warn-long 158.3 src/sage/graphs/strongly_regular_db.pyx  # 
4 doctests failed
----------------------------------------------------------------------
Total time for all tests: 812.0 seconds
    cpu time: 20.9 seconds
    cumulative wall time: 811.9 seconds
charpent@zen-book-flip:/usr/local/sage-P3$ sage -t --long --warn-long 158.3 
src/sage/algebras/quantum_groups/quantum_group_gap.py
Running doctests with ID 2019-08-12-15-51-25-c5d0cde8.
Git branch: develop
Using 
--optional=build,dochtml,dot2tex,fricas,gap_packages,giacpy_sage,libsemigroups,memlimit,mpir,python2,sage
Doctesting 1 file.
sage -t --long --warn-long 158.3 
src/sage/algebras/quantum_groups/quantum_group_gap.py
**********************************************************************
File "src/sage/algebras/quantum_groups/quantum_group_gap.py", line 1553, in 
sage.algebras.quantum_groups.quantum_group_gap.QuantumGroupModule._latex_
Failed example:
    latex(S)  # optional - gap_packages  # random (depends on dot2tex)
Exception raised:
    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1105, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.algebras.quantum_groups.quantum_group_gap.QuantumGroupModule._latex_[4]>", 
line 1, in <module>
        latex(S)  # optional - gap_packages  # random (depends on dot2tex)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/misc/latex.py", 
line 925, in __call__
        return LatexExpr(x._latex_())
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/algebras/quantum_groups/quantum_group_gap.py",
 
line 1559, in _latex_
        return latex(self.crystal_graph())
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/algebras/quantum_groups/quantum_group_gap.py",
 
line 2098, in crystal_graph
        for p in G[b'points']]
      File "sage/libs/gap/element.pyx", line 3157, in 
sage.libs.gap.element.GapElement_Record.__getitem__ 
(build/cythonized/sage/libs/gap/element.c:22566)
        sig_on()
    cysignals.signals.SignalError: Segmentation fault
**********************************************************************
File "src/sage/algebras/quantum_groups/quantum_group_gap.py", line 1658, in 
sage.algebras.quantum_groups.quantum_group_gap.QuantumGroupModule.crystal_graph
Failed example:
    G = V.crystal_graph(); G            # optional - gap_packages
Exception raised:
    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1105, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.algebras.quantum_groups.quantum_group_gap.QuantumGroupModule.crystal_graph[2]>",
 
line 1, in <module>
        G = V.crystal_graph(); G            # optional - gap_packages
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/algebras/quantum_groups/quantum_group_gap.py",
 
line 1666, in crystal_graph
        vertices = [CrystalGraphVertex(self, repr(p)) for p in G[b'points']]
      File "sage/libs/gap/element.pyx", line 3157, in 
sage.libs.gap.element.GapElement_Record.__getitem__ 
(build/cythonized/sage/libs/gap/element.c:22566)
        sig_on()
    cysignals.signals.SignalError: Segmentation fault
**********************************************************************
File "src/sage/algebras/quantum_groups/quantum_group_gap.py", line 1662, in 
sage.algebras.quantum_groups.quantum_group_gap.QuantumGroupModule.crystal_graph
Failed example:
    G.is_isomorphic(B.digraph(), edge_labels=True)  # optional - 
gap_packages
Exception raised:
    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1105, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.algebras.quantum_groups.quantum_group_gap.QuantumGroupModule.crystal_graph[4]>",
 
line 1, in <module>
        G.is_isomorphic(B.digraph(), edge_labels=True)  # optional - 
gap_packages
    NameError: name 'G' is not defined
**********************************************************************
File "src/sage/algebras/quantum_groups/quantum_group_gap.py", line 2082, in 
sage.algebras.quantum_groups.quantum_group_gap.HighestWeightSubmodule.crystal_graph
Failed example:
    G = S.crystal_graph()                    # optional - gap_packages
Exception raised:
    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1105, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.algebras.quantum_groups.quantum_group_gap.HighestWeightSubmodule.crystal_graph[4]>",
 
line 1, in <module>
        G = S.crystal_graph()                    # optional - gap_packages
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/algebras/quantum_groups/quantum_group_gap.py",
 
line 2098, in crystal_graph
        for p in G[b'points']]
      File "sage/libs/gap/element.pyx", line 3157, in 
sage.libs.gap.element.GapElement_Record.__getitem__ 
(build/cythonized/sage/libs/gap/element.c:22566)
        sig_on()
    cysignals.signals.SignalError: Segmentation fault
**********************************************************************
File "src/sage/algebras/quantum_groups/quantum_group_gap.py", line 2083, in 
sage.algebras.quantum_groups.quantum_group_gap.HighestWeightSubmodule.crystal_graph
Failed example:
    sorted(G.vertices(), key=str)            # optional - gap_packages
Exception raised:
    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1105, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.algebras.quantum_groups.quantum_group_gap.HighestWeightSubmodule.crystal_graph[5]>",
 
line 1, in <module>
        sorted(G.vertices(), key=str)            # optional - gap_packages
    NameError: name 'G' is not defined
**********************************************************************
File "src/sage/algebras/quantum_groups/quantum_group_gap.py", line 2087, in 
sage.algebras.quantum_groups.quantum_group_gap.HighestWeightSubmodule.crystal_graph
Failed example:
    sorted(S.crystal_graph(False).vertices(), key=str)  # optional - 
gap_packages
Exception raised:
    Traceback (most recent call last):
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 681, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/doctest/forker.py", 
line 1105, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.algebras.quantum_groups.quantum_group_gap.HighestWeightSubmodule.crystal_graph[6]>",
 
line 1, in <module>
        sorted(S.crystal_graph(False).vertices(), key=str)  # optional - 
gap_packages
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/algebras/quantum_groups/quantum_group_gap.py",
 
line 2092, in crystal_graph
        return QuantumGroupModule.crystal_graph(self)
      File 
"/usr/local/sage-P3/local/lib/python3.7/site-packages/sage/algebras/quantum_groups/quantum_group_gap.py",
 
line 1666, in crystal_graph
        vertices = [CrystalGraphVertex(self, repr(p)) for p in G[b'points']]
      File "sage/libs/gap/element.pyx", line 3157, in 
sage.libs.gap.element.GapElement_Record.__getitem__ 
(build/cythonized/sage/libs/gap/element.c:22566)
        sig_on()
    cysignals.signals.SignalError: Segmentation fault
**********************************************************************
3 items had failures:
   3 of   8 in 
sage.algebras.quantum_groups.quantum_group_gap.HighestWeightSubmodule.crystal_graph
   1 of   6 in 
sage.algebras.quantum_groups.quantum_group_gap.QuantumGroupModule._latex_
   2 of   6 in 
sage.algebras.quantum_groups.quantum_group_gap.QuantumGroupModule.crystal_graph
    [529 tests, 6 failures, 8.18 s]
----------------------------------------------------------------------
sage -t --long --warn-long 158.3 
src/sage/algebras/quantum_groups/quantum_group_gap.py  # 6 doctests failed
----------------------------------------------------------------------
Total time for all tests: 8.3 seconds
    cpu time: 8.2 seconds
    cumulative wall time: 8.2 seconds
charpent@zen-book-flip:/usr/local/sage-P3$ sage -t --long --warn-long 158.3 
src/sage/rings/polynomial/polynomial_rational_flint.pyx
Running doctests with ID 2019-08-12-15-52-12-95ad56f7.
Git branch: develop
Using 
--optional=build,dochtml,dot2tex,fricas,gap_packages,giacpy_sage,libsemigroups,memlimit,mpir,python2,sage
Doctesting 1 file.
sage -t --long --warn-long 158.3 
src/sage/rings/polynomial/polynomial_rational_flint.pyx
**********************************************************************
File "src/sage/rings/polynomial/polynomial_rational_flint.pyx", line 2055, 
in 
sage.rings.polynomial.polynomial_rational_flint.Polynomial_rational_flint.galois_group
Failed example:
    G = f.galois_group(); G
Expected:
    Transitive group number 5 of degree 4
Got:
    Exception (FLINT memory_manager). Unable to allocate memory.
    Transitive group number 5 of degree 4
**********************************************************************
1 item had failures:
   1 of  16 in 
sage.rings.polynomial.polynomial_rational_flint.Polynomial_rational_flint.galois_group
    [397 tests, 1 failure, 3.91 s]
----------------------------------------------------------------------
sage -t --long --warn-long 158.3 
src/sage/rings/polynomial/polynomial_rational_flint.pyx  # 1 doctest failed
----------------------------------------------------------------------
Total time for all tests: 4.0 seconds
    cpu time: 3.5 seconds
    cumulative wall time: 3.9 seconds

HTH,


Le samedi 10 août 2019 19:49:47 UTC+2, Volker Braun a écrit :
>
> 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 
>
>
> 213fe0ba4d (tag: 8.9.beta6, trac/develop) Updated SageMath version to 
> 8.9.beta6
> 442411009b Trac #23573: Implement suffix walk for suffix tree
> 8d79f08bdf Trac #28332: dot2tex fails self-tests
> c3b74b06f9 Trac #28330: Cygwin: Use cygstart instead of rundll32 to open 
> files/websites
> 223ef8bc38 Trac #27295: Add GAP's Semigroups package to gap_packages
> 849d1c6f1d Trac #27396: add libsemigroups package
> 5f09146e65 Trac #24324: DyckWords.options.display does not work
> b201000163 Trac #28276: Fix tex_from_skew_array format command for 
> tuple-valued arrays
> b945d46218 Trac #28314: fixing a few calls of all(list)
> 41ec91a253 Trac #28308: some typos
> d6ef82c599 Trac #28305: py3 fix for 
> combinat/root_system/non_symmetric_macdonald_polynomials.py
> 188dc36616 Trac #28152: Planar graph layout does not respect clockwise 
> ordering of neighbors in combinatorial embedding
> cf987b94df Trac #28119: Implement random triangulations of a polygon
> f1bfb6af08 Trac #27634: Clean up the code and the documentation for the 
> coding section
> 191e879cdd Trac #28295: spkg-configure.m4 for mpfi
> 5ad71230a1 Trac #28273: allow laziness in DisjointUnionEnumeratedSet
> 189a96bb1d Trac #28231: spkg-configure.m4 for lrcalc
> 7ff2a50ff3 Trac #28109: Renaming and improvement of periodic point methods
> ca069e9afd Trac #28070: is_conjugate bug fix and enhancements
> c3ffb5d918 Trac #28027: Adding cyclegraph functionality to product 
> projective dynamical systems
> d710aacd9c Trac #28312: py3 small fix for quantum group gap
> 5845d75c7c Trac #28306: refresh the file ell_generic.py
> 4c993d118c Trac #28291: Speed up access to coefficients of general number 
> field elements
> 707b99aa7e Trac #28288: Direct conversion from number fields to complex 
> ball fields
> 334ff06023 Trac #28286: removed deprecated alias in tiling.py
> 2bae93e74b Trac #28285: remove deprecated alias in finance
> 81479570f1 Trac #28283: remove content in polynomial
> fb3aa72ab2 Trac #28110: Bug in Hilbert series computation
> 9a0cb42f33 Trac #28287: alarm test failure in 
> CombinatorialPolyhedron.f_vector
> ac8cf16c5c (tag: 8.9.beta5) Updated SageMath version to 8.9.beta5
>

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