FWIW, on another machine running Debian testing on core i5 + 8 GB RAM, 
*upgrading* from 9.5.beta2 to 9.5.beta5 succeeded, but ptestlong left 6 
permanent failures, all of which being numerical noise or cosmetic booboos :
Test Result P/T Comment 
src/sage/functions/other.py 1 doctest failed P Numerical noise 
src/sage/calculus/calculus.py 1 doctest failed P Cosmetic 
src/sage/rings/complex_arb.pyx 11 doctests failed P Numerical noise 
src/sage/functions/gamma.py 3 doctests failed P Numerical noise 
src/sage/lfunctions/pari.py 1 doctest failed P Cosmetic 
src/sage/rings/real_arb.pyx 6 doctests failed P Numerical noise 

Re-running the failed tests gave the following results :

Running doctests with ID 2021-11-05-13-11-59-6a0701ff.
Git branch: develop
Using 
--optional=build,debian,dochtml,dot2tex,fricas,gap_packages,libsemigroups,pip,sage,sage_spkg
Doctesting 1 file.
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/functions/other.py
**********************************************************************
File "src/sage/functions/other.py", line 1581, in 
sage.functions.other.Function_factorial.__init__
Failed example:
    factorial(RBF(4.2))
Expected:
    [32.5780960503313 +/- 6.72e-14]
Got:
    [32.5780960503314 +/- 6.06e-14]
**********************************************************************
1 item had failures:
   1 of  39 in sage.functions.other.Function_factorial.__init__
    [501 tests, 1 failure, 14.39 s]
----------------------------------------------------------------------
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/functions/other.py  # 
1 doctest failed
----------------------------------------------------------------------
Total time for all tests: 14.5 seconds
    cpu time: 16.1 seconds
    cumulative wall time: 14.4 seconds
Pytest is not installed, skip checking tests that rely on it.
Running doctests with ID 2021-11-05-13-12-17-67da9e1a.
Git branch: develop
Using 
--optional=build,debian,dochtml,dot2tex,fricas,gap_packages,libsemigroups,pip,sage,sage_spkg
Doctesting 1 file.
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/calculus/calculus.py
**********************************************************************
File "src/sage/calculus/calculus.py", line 1289, in sage.calculus.calculus.limit
Failed example:
    limit(e^(-1/x), x=0, dir='left', algorithm='fricas')              # 
optional - fricas
Expected:
    +Infinity
Got:
    plusInfinity()
**********************************************************************
1 item had failures:
   1 of  72 in sage.calculus.calculus.limit
    [455 tests, 1 failure, 13.43 s]
----------------------------------------------------------------------
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/calculus/calculus.py  
# 1 doctest failed
----------------------------------------------------------------------
Total time for all tests: 13.5 seconds
    cpu time: 12.2 seconds
    cumulative wall time: 13.4 seconds
Pytest is not installed, skip checking tests that rely on it.
Running doctests with ID 2021-11-05-13-12-35-b5ca33e7.
Git branch: develop
Using 
--optional=build,debian,dochtml,dot2tex,fricas,gap_packages,libsemigroups,pip,sage,sage_spkg
Doctesting 1 file.
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/rings/complex_arb.pyx
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 1043, in 
sage.rings.complex_arb.ComplexBallField.?
Failed example:
    CBF.integral(lambda x, _: x.gamma(), 1 - CBF(i), 1 + CBF(i))
Expected:
    [+/- 4...e-15] + [1.5723926694981 +/- 4...e-14]*I
Got:
    [+/- 1.39e-15] + [1.57239266949806 +/- 8.33e-15]*I
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 1147, in 
sage.rings.complex_arb.ComplexBallField.?
Failed example:
    CBF.integral(lambda x, _: (1 + i*x).gamma(), -1, 1)
Expected:
    [1.5723926694981 +/- 4...e-14] + [+/- 4...e-15]*I
Got:
    [1.57239266949806 +/- 8.33e-15] + [+/- 1.39e-15]*I
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 2979, in 
sage.rings.complex_arb.ComplexBall.rising_factorial
Failed example:
    CBF(1/2).rising_factorial(CBF(2,3))
Expected:
    [-0.123060451458124 +/- ...e-16] + [0.040641263167655 +/- ...e-16]*I
Got:
    [-0.123060451458124 +/- 3.06e-16] + [0.0406412631676552 +/- 7.57e-17]*I
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 3491, in 
sage.rings.complex_arb.ComplexBall.gamma
Failed example:
    CBF(1, 1).gamma()
Expected:
    [0.498015668118356 +/- ...e-16] + [-0.154949828301811 +/- ...e-16]*I
Got:
    [0.498015668118356 +/- 1.26e-16] + [-0.1549498283018107 +/- 8.43e-17]*I
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 3495, in 
sage.rings.complex_arb.ComplexBall.gamma
Failed example:
    CBF(1, 1).gamma(0)
Expected:
    [0.498015668118356 +/- ...e-16] + [-0.154949828301811 +/- ...e-16]*I
Got:
    [0.498015668118356 +/- 1.26e-16] + [-0.1549498283018107 +/- 8.43e-17]*I
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 3499, in 
sage.rings.complex_arb.ComplexBall.gamma
Failed example:
    CBF(1, 1).gamma(CLF(i))
Expected:
    [0.32886684193500 +/- ...e-15] + [-0.18974945045621 +/- ...e-15]*I
Got:
    [0.328866841935004 +/- 7.07e-16] + [-0.189749450456210 +/- 9.05e-16]*I
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 3538, in 
sage.rings.complex_arb.ComplexBall.log_gamma
Failed example:
    CBF(-1).log_gamma()
Expected:
    nan + [-3.141592653589793 +/- ...e-16]*I
Got:
    nan + nan*I
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 3540, in 
sage.rings.complex_arb.ComplexBall.log_gamma
Failed example:
    CBF(-3/2).log_gamma()
Expected:
    [0.860047015376481 +/- ...e-16] + [-6.28318530717959 +/- ...e-15]*I
Got:
    [0.860047015376481 +/- 3.82e-16] + [-6.283185307179586 +/- 6.77e-16]*I
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 3825, in 
sage.rings.complex_arb.ComplexBall.hypergeometric
Failed example:
    CBF(2+3*I).hypergeometric([1/4,1/3],[1/2])
Expected:
    [0.7871684267473 +/- 7...e-14] + [0.2749254173721 +/- 9...e-14]*I
Got:
    [0.7871684267473 +/- 6.79e-14] + [0.2749254173721 +/- 8.82e-14]*I
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 3835, in 
sage.rings.complex_arb.ComplexBall.hypergeometric
Failed example:
    CBF(2016).hypergeometric([], [2/3])
Expected:
    [2.025642692328e+38 +/- ...e+25]
Got:
    [2.0256426923278e+38 +/- 9.59e+24]
**********************************************************************
File "src/sage/rings/complex_arb.pyx", line 4930, in 
sage.rings.complex_arb.ComplexBall.laguerre_L
Failed example:
    CBF(5,7).laguerre_L(CBF(2,3), CBF(1,-2))
Expected:
    [5515.315030271 +/- ...e-10] + [-12386.942845271 +/- ...e-10]*I
Got:
    [5515.3150302713 +/- 5.02e-11] + [-12386.9428452714 +/- 6.21e-11]*I
**********************************************************************
6 items had failures:
   3 of   6 in sage.rings.complex_arb.ComplexBall.gamma
   2 of  17 in sage.rings.complex_arb.ComplexBall.hypergeometric
   1 of   4 in sage.rings.complex_arb.ComplexBall.laguerre_L
   2 of   6 in sage.rings.complex_arb.ComplexBall.log_gamma
   1 of   7 in sage.rings.complex_arb.ComplexBall.rising_factorial
   2 of  57 in sage.rings.complex_arb.ComplexBallField.?
    [644 tests, 11 failures, 4.38 s]
----------------------------------------------------------------------
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/rings/complex_arb.pyx  
# 11 doctests failed
----------------------------------------------------------------------
Total time for all tests: 4.6 seconds
    cpu time: 4.5 seconds
    cumulative wall time: 4.4 seconds
Pytest is not installed, skip checking tests that rely on it.
Running doctests with ID 2021-11-05-13-12-43-59f88657.
Git branch: develop
Using 
--optional=build,debian,dochtml,dot2tex,fricas,gap_packages,libsemigroups,pip,sage,sage_spkg
Doctesting 1 file.
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/functions/gamma.py
**********************************************************************
File "src/sage/functions/gamma.py", line 360, in 
sage.functions.gamma.Function_gamma_inc._method_arguments
Failed example:
    gamma(b)
Expected:
    [1.00000000 +/- 8.07e-10]
Got:
    [1.0000000000 +/- 5.78e-11]
**********************************************************************
File "src/sage/functions/gamma.py", line 362, in 
sage.functions.gamma.Function_gamma_inc._method_arguments
Failed example:
    gamma(CBF(b))
Expected:
    [1.00000000 +/- 8.07e-10]
Got:
    [1.0000000000 +/- 5.78e-11]
**********************************************************************
File "src/sage/functions/gamma.py", line 364, in 
sage.functions.gamma.Function_gamma_inc._method_arguments
Failed example:
    gamma(CBF(b), 4)
Expected:
    [0.01831564 +/- 2.65e-9]
Got:
    [0.018315639 +/- 9.00e-10]
**********************************************************************
1 item had failures:
   3 of   6 in sage.functions.gamma.Function_gamma_inc._method_arguments
    [218 tests, 3 failures, 3.09 s]
----------------------------------------------------------------------
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/functions/gamma.py  # 
3 doctests failed
----------------------------------------------------------------------
Total time for all tests: 3.2 seconds
    cpu time: 1.8 seconds
    cumulative wall time: 3.1 seconds
Pytest is not installed, skip checking tests that rely on it.
Running doctests with ID 2021-11-05-13-12-49-2129e1d9.
Git branch: develop
Using 
--optional=build,debian,dochtml,dot2tex,fricas,gap_packages,libsemigroups,pip,sage,sage_spkg
Doctesting 1 file.
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/lfunctions/pari.py
**********************************************************************
File "src/sage/lfunctions/pari.py", line 318, in 
sage.lfunctions.pari.lfun_number_field
Failed example:
    L(0)
Expected:
    0.000000000000000
Got:
      ***   Warning: normalizing a series with 0 leading term.
    0.000000000000000
**********************************************************************
1 item had failures:
   1 of   8 in sage.lfunctions.pari.lfun_number_field
    [166 tests, 1 failure, 0.95 s]
----------------------------------------------------------------------
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/lfunctions/pari.py  # 
1 doctest failed
----------------------------------------------------------------------
Total time for all tests: 5.9 seconds
    cpu time: 0.8 seconds
    cumulative wall time: 0.9 seconds
Pytest is not installed, skip checking tests that rely on it.
Running doctests with ID 2021-11-05-13-12-59-df0ee8d0.
Git branch: develop
Using 
--optional=build,debian,dochtml,dot2tex,fricas,gap_packages,libsemigroups,pip,sage,sage_spkg
Doctesting 1 file.
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/rings/real_arb.pyx
**********************************************************************
File "src/sage/rings/real_arb.pyx", line 755, in 
sage.rings.real_arb.RealBallField.euler_constant
Failed example:
    RBF.euler_constant()
Expected:
    [0.577215664901533 +/- ...e-16]
Got:
    [0.5772156649015329 +/- 9.00e-17]
**********************************************************************
File "src/sage/rings/real_arb.pyx", line 899, in 
sage.rings.real_arb.RealBallField.gamma
Failed example:
    RBF.gamma(RLF(pi))
Expected:
    [2.2880377953400 +/- ...e-14]
Got:
    [2.28803779534003 +/- 4.12e-15]
**********************************************************************
File "src/sage/rings/real_arb.pyx", line 1159, in sage.rings.real_arb.RealBall
Failed example:
    b
Expected:
    [-0.577215664901533 +/- ...e-16]
Got:
    [-0.5772156649015329 +/- 4.84e-17]
**********************************************************************
File "src/sage/rings/real_arb.pyx", line 1305, in 
sage.rings.real_arb.RealBall.__init__
Failed example:
    RealBall(RBF, sage.symbolic.constants.EulerGamma())
Expected:
    [0.577215664901533 +/- ...e-16]
Got:
    [0.5772156649015329 +/- 9.00e-17]
**********************************************************************
File "src/sage/rings/real_arb.pyx", line 3539, in 
sage.rings.real_arb.RealBall.rising_factorial
Failed example:
    RBF(1/2).rising_factorial(1/3)
Expected:
    [0.63684988431797 +/- ...e-15]
Got:
    [0.636849884317974 +/- 8.98e-16]
**********************************************************************
File "src/sage/rings/real_arb.pyx", line 3555, in 
sage.rings.real_arb.RealBall.psi
Failed example:
    RBF(1).psi()
Expected:
    [-0.577215664901533 +/- ...e-16]
Got:
    [-0.5772156649015329 +/- 4.84e-17]
**********************************************************************
6 items had failures:
   1 of   5 in sage.rings.real_arb.RealBall
   1 of  48 in sage.rings.real_arb.RealBall.__init__
   1 of   2 in sage.rings.real_arb.RealBall.psi
   1 of   3 in sage.rings.real_arb.RealBall.rising_factorial
   1 of   3 in sage.rings.real_arb.RealBallField.euler_constant
   1 of   6 in sage.rings.real_arb.RealBallField.gamma
    [544 tests, 6 failures, 0.41 s]
----------------------------------------------------------------------
sage -t --long --warn-long 71.2 --random-seed=0 src/sage/rings/real_arb.pyx  # 
6 doctests failed
----------------------------------------------------------------------
Total time for all tests: 0.5 seconds
    cpu time: 0.4 seconds
    cumulative wall time: 0.4 seconds
Pytest is not installed, skip checking tests that rely on it.

​
Le samedi 30 octobre 2021 à 20:34:21 UTC+2, Emmanuel Charpentier a écrit :

> After rebuilding and reinstalling the same (really) optional packages, 
> `ptestlong` gets exactly one (reproducible) failure, i. e. the one reported 
> by Samuel Lelièvre.
>
> I am at loss as to why I needed to rebuild 9.5 from sratch instead of 
> upgrading from 9.3. Ideas ?
>
> HTH,
>
>
> Le samedi 30 octobre 2021 à 17:55:30 UTC+2, Emmanuel Charpentier a écrit :
>
>> Aaaarghhh : cypari2 is installed by Sage itself : after (some operations 
>> amounting to removing Python packages, then) make distclean && make : 
>>
>> charpent@zen-book-flip:/usr/local/sage-9$ sage -optional | grep -v ot_instal
>> /usr/local/sage-9/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/misc/package.py:116:
>>  UserWarning: failed to fetch the version of pkg='ore_algebra' at 
>> https://pypi.org/pypi/ore_algebra/json
>>   warnings.warn("failed to fetch the version of pkg={!r} at {}".format(pkg, 
>> url))
>> [package]...............................[latest version] ([version])
>>
>> cypari2.................................? (2.1.2)
>> python_dateutil.........................? (2.8.1)
>> sagemath_standard.......................? (9.5b5)
>>
>> I’ll reinstall the other packages and retest notwithstanding…
>> ​
>>
>> Le samedi 30 octobre 2021 à 14:40:35 UTC+2, Emmanuel Charpentier a écrit :
>>
>>> I tried to upgrade 9.5.beta3 to 9.5.beta5 ith the following packages 
>>> installed :
>>>
>>> cmdstanpy...............................? (0.9.77)
>>> cypari2.................................? (2.1.2)
>>> dot2tex.................................2.11.3.p0 (2.11.3.p0)
>>> fricas..................................1.3.7.p1 (1.3.7.p1)
>>> gap_packages............................4.11.1 (4.11.1)
>>> json5...................................? (0.9.6)
>>> jupyterlab..............................3.2.1 (2.2.10)
>>> jupyterlab_server.......................? (1.2.0)
>>> jupyterlab_widgets......................none (2.0)
>>> libsemigroups...........................1.1.0 (1.1.0)
>>> nodeenv.................................1.6.0 (1.4.0)
>>> nodejs..................................none (12.18.3)
>>> nose....................................? (1.3.7)
>>> pandas..................................? (1.3.3)
>>> psutil..................................? (5.2.0.p2)
>>> python_dateutil.........................? (2.8.1)
>>> sagemath_standard.......................? (9.5b5)
>>> ujson...................................? (4.2.0)
>>>
>>> ptestlong gives the following looong list of failures crashing Sage :
>>>
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/schemes/elliptic_curves/isogeny_small_degree.py  # Killed due to 
>>> segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/schemes/elliptic_curves/ell_rational_field.py  # Killed due to 
>>> segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/schemes/elliptic_curves/ell_number_field.py  # Killed due to 
>>> segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/schemes/cyclic_covers/cycliccover_finite_field.py  # Killed due to 
>>> segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/pollack_stevens/modsym.py  # 9 doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/rings/number_field/number_field.py  # Killed due to segmentation 
>>> fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modform/element.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/dynamics/arithmetic_dynamics/projective_ds.py  # Killed due to 
>>> segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/graphs/generic_graph.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modform/ring.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/tests/books/computational-mathematics-with-sagemath/combinat_doctest.py
>>>   # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/schemes/elliptic_curves/heegner.py  # Killed due to segmentation 
>>> fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/interfaces/fricas.py  # 1 doctest failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/btquotients/pautomorphicform.py  # Killed due to 
>>> segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/misc/sageinspect.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/matrix/matrix_integer_dense_hnf.py  # Killed due to segmentation 
>>> fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/local_comp/local_comp.py  # 4 doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modform_hecketriangle/hecke_triangle_group_element.py  # 8 
>>> doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modules/free_module_integer.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/schemes/elliptic_curves/ell_curve_isogeny.py  # Killed due to 
>>> segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modform_hecketriangle/graded_ring_element.py  # 25 
>>> doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/arith/misc.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/rings/qqbar.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modform_hecketriangle/readme.py  # 12 doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/matrix/matrix2.pyx  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/combinat/tutorial.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/quadratic_forms/genera/genus.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/calculus/calculus.py  # 5 doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modform_hecketriangle/abstract_space.py  # 21 doctests 
>>> failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/combinat/partition.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/abvar/abvar.py  # 10 doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modform/ambient_R.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/matrix/matrix_integer_dense.pyx  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/misc/cachefunc.pyx  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/algebras/quatalg/quaternion_algebra.py  # Killed due to 
>>> segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modform/constructor.py  # 1 doctest failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modules/free_quadratic_module_integer_symmetric.py  # Killed due 
>>> to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/en/thematic_tutorials/explicit_methods_in_number_theory/birds_other.rst
>>>   # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/abvar/lseries.py  # 8 doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modsym/space.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/matrix/benchmark.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/btquotients/btquotient.py  # Killed due to segmentation 
>>> fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/rings/number_field/S_unit_solver.py  # Killed due to segmentation 
>>> fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/overconvergent/genus0.py  # Killed due to segmentation 
>>> fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/hecke/submodule.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/typeset/ascii_art.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modform_hecketriangle/element.py  # 10 doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/functions/log.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/schemes/plane_conics/con_rational_function_field.py  # Killed due 
>>> to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/structure/sage_object.pyx  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/matrix/matrix_rational_dense.pyx  # Killed due to segmentation 
>>> fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/repl/ipython_extension.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/repl/interpreter.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/hecke/module.py  # 2 doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/rings/number_field/order.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modules/fg_pid/fgp_module.py  # 1 doctest failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/ja/a_tour_of_sage/index.rst  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/combinat/quickref.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/fr/a_tour_of_sage/index.rst  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/tr/a_tour_of_sage/index.rst  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/pt/a_tour_of_sage/index.rst  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/de/a_tour_of_sage/index.rst  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/graphs/base/static_sparse_graph.pyx  # Killed due to segmentation 
>>> fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/hu/a_tour_of_sage/index.rst  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/it/a_tour_of_sage/index.rst  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/en/a_tour_of_sage/index.rst  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/matrix/matrix_cyclo_dense.pyx  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/es/a_tour_of_sage/index.rst  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/combinat/combinat.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/functions/transcendental.py  # 1 doctest failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/matrix/matrix_integer_sparse.pyx  # 1 doctest failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modsym/subspace.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/hecke/element.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modsym/tests.py  # 1 doctest failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/repl/display/formatter.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/repl/interface_magic.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/doc/en/thematic_tutorials/explicit_methods_in_number_theory/modabvar.rst
>>>   # 3 doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/tests/book_stein_modform.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/repl/ipython_tests.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/repl/attach.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/abvar/cuspidal_subgroup.py  # 9 doctests failed
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/rings/polynomial/real_roots.pyx  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/quadratic_forms/quadratic_form__local_density_interfaces.py  # 
>>> Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/matrix/constructor.pyx  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/modform/vm_basis.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/rings/bernmm.pyx  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/repl/rich_output/backend_ipython.py  # Killed due to segmentation 
>>> fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/modular/buzzard.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/interfaces/macaulay2.py  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/libs/flint/arith.pyx  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/matrix/misc.pyx  # Killed due to segmentation fault
>>> sage -t --long --warn-long 215.7 
>>> --random-seed=276876733579103606015550424535934104048 
>>> src/sage/rings/bernoulli_mod_p.pyx  # Killed due to segmentation fault
>>>
>>> Python error messages *seen* (but not logged) during ptestlong or 
>>> attempts to reproduce the tests point to a problem in cypari2 which 
>>> somehow managed to invite itself.
>>>
>>> I’ll try to recompile after distclean, reinstall packages (cautiously 
>>> avoiding cypari2), retest and report.
>>>
>>> HTH,
>>> ​
>>>
>>> Le vendredi 29 octobre 2021 à 23:42:11 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 
>>>>
>>>> f716a0b366 (tag: 9.5.beta5, trac/develop) Updated SageMath version to 
>>>> 9.5.beta5
>>>> c5a87834e7 Trac #32758: fix E713 and E714 in schemes
>>>> 50776daec4 Trac #32757: last fixes for relint linter
>>>> d95005e277 Trac #32756: fix E713 and E714 in combinat
>>>> 60c6b1911d Trac #32755: fix E713 and E714 in rings
>>>> 8a27526e7c Trac #32722: argcomplete should be a standard package
>>>> bac0d56c89 Trac #32660: Add 
>>>> sage.rings.abc.{AlgebraicField,...,NumberField_quadratic}, deprecate 
>>>> is_AlgebraicField, ..., is_CyclotomicField, is_QuadraticField
>>>> 7dd78eff36 Trac #2877: security risk -- restrict the input of eval in 
>>>> CC constructor
>>>> cf1a7a533d Trac #32205: Removing deprecated parameters and methods in 
>>>> projective_ds
>>>> 0574dae5f9 Trac #32635: sage.matrix.matrix_space: Import element 
>>>> classes on demand, fall back to generic on ImportError
>>>> 61d9294bcd Trac #32743: use .pair() for quaternions instead of inlining 
>>>> the definition
>>>> bf65712f5f Trac #32739: change order of indices in doc test of quantum 
>>>> determinant
>>>> cd3aa6fbac Trac #32555: Typo in doc/en/developer/portability_testing.rst
>>>> 72e76991cd Trac #32446: fix doctest formatting in 
>>>> schemes/elliptic_curves/ell_curve_isogeny.py
>>>> 363c071d57 Trac #32632: computing elliptic-curve isomorphisms in 
>>>> characteristic 2 sometimes fails
>>>> 9fdf3832f9 Trac #32630: Fix docstring in Polyhedron method 
>>>> representative_point
>>>> a15c58c9d6 Trac #32582: Add colored Jones polynomial
>>>> f35c2c81c3 Trac #17442: Italian translation of tutorial
>>>> c1a55a62d1 Trac #32729: working on annotations in combinat
>>>> 37afc35b18 Trac #32728: Get rid of <type in doctests and the mechanism 
>>>> that allows this
>>>> d8e6aed16d Trac #32717: Move sage.functions.other.sqrt to 
>>>> sage.misc.functional
>>>> 5ddfc23e0a Trac #32695: 5 internet doctests failing in 
>>>> src/sage/databases/oeis.py
>>>> 753406109a Trac #32656: Eliminate psutil (memory management) dependency
>>>> 04a39c6e1b Trac #29024: spkg-configure.m4 for singular
>>>> 8ba7c02710 Trac #28207: Derivative of piecewise function returns junk
>>>> b970bc92d1 Trac #32737: Fix doctest in src/sage/rings/integer.pyx
>>>> ec536c7872 Trac #32495: EllipticCurveIsogeny._richcmp_ does not use the 
>>>> kernel polynomial
>>>> 9750b0ef92 Trac #32490: multiplication_by_m_isogeny is only correct up 
>>>> to automorphism
>>>> b6b1b25e77 Trac #32469: Improve ecl interface
>>>> 7407db130b Trac #32445: Do not access M4RI internals
>>>> 5e674821ad Trac #32440: shifting power series doesn't keep track of 
>>>> precision correctly
>>>> bc6791f518 Trac #32430: remove obsolete code in 
>>>> EllipticCurveIsogeny.is_normalized()
>>>> 225ac125f8 Trac #32723: Helper function to avoid duplicated code when 
>>>> using weights
>>>> 1a9bb6d29d Trac #32680: more pycodestyle checks again
>>>> 3c6a07afc9 Trac #32727: complete mpir deletion
>>>> 56ec53a51b Trac #32712: sage.tensor.modules: make doctests involving SR 
>>>> optional
>>>> 11684c278f Trac #32708: sage.tensor.modules: remove dependency on 
>>>> sage.manifolds
>>>> a8e7da2709 Trac #32691: setuptools: Upgrade to 58.2.0, remove old 
>>>> easy_install patch
>>>> 4e42232b97 Trac #32690: add factor method to interval-posets
>>>> e87eb57a8e Trac #32685: Ill-placed y label in 
>>>> sage.manifolds.utilities.set_axes_labels
>>>> 20e5ed68cc Trac #32684: various details in combinat and functions
>>>> e75948b94e Trac #32637: Add sage.geometry.abc; remove uses of 
>>>> is_Polyhedron, is_LatticePolytope, is_Cone outside of sage.geometry
>>>> 08d189cd3a Trac #32607: compatibility with gsl 2.7
>>>> fa012254ac Trac #32665: Deprecate is_[Callable]SymbolicExpressionRing, 
>>>> remove use of is_Symbolic{Equation,Variable}, is_CallableSymbolicExpression
>>>> e7f6b13107 Trac #32649: Replace sage.doctest.external.has_* functions 
>>>> by Features
>>>> aac663be0d Trac #32659: sdh_pip_install: Force reinstallation of built 
>>>> wheels; add sage_setup source deps
>>>> 056b8d4e7b (tag: 9.5.beta4) Updated SageMath version to 9.5.beta4
>>>>
>>>>

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