FWIW, on Debian testing running on core i7 + 16 GB RAM upgrading from 
9.5.beta9 and running ptestlong results in two ermanent failures :

sage -t --long --warn-long 230.6 
--random-seed=55945959185617375554737887082041268498 
src/sage/algebras/quantum_groups/quantum_group_gap.py  # 1 doctest failed
sage -t --long --warn-long 230.6 
--random-seed=55945959185617375554737887082041268498 
src/sage/functions/min_max.py  # 2 doctests failed

The first one has already been reported.

Re-running them results in :

charpent@zen-book-flip:/usr/local/sage-9$ sage -t --long --warn-long 230.6 
--random-seed=55945959185617375554737887082041268498 
src/sage/algebras/quantum_groups/quantum_group_gap.py  # 1 doctest failed
Running doctests with ID 2022-01-10-17-58-44-00fb8404.
Git branch: develop
Using 
--optional=build,debian,debugpy,dot2tex,fricas,gap_packages,libsemigroups,pip,sage,sage_spkg
Features to be detected: 
4ti2,benzene,bliss,buckygen,conway_polynomials,csdp,database_cremona_ellcurve,database_cremona_mini_ellcurve,database_jones_numfield,database_knotinfo,dvipng,ffmpeg,graphviz,imagemagick,jupymake,kenzo,latte_int,lrslib,mcqd,meataxe,pandoc,pdf2svg,plantri,pynormaliz,rubiks,sage.combinat,sage.geometry.polyhedron,sage.graphs,sage.plot,sage.rings.number_field,sage.rings.real_double,sage.symbolic,sage_numerical_backends_coin,sagemath_doc_html,sphinx,tdlib
Doctesting 1 file.
sage -t --long --warn-long 230.6 
--random-seed=55945959185617375554737887082041268498 
src/sage/algebras/quantum_groups/quantum_group_gap.py
**********************************************************************
File "src/sage/algebras/quantum_groups/quantum_group_gap.py", line 1752, in 
sage.algebras.quantum_groups.quantum_group_gap.HighestWeightModule._latex_
Failed example:
    latex(V)  # optional - gap_packages
Expected:
    V(\Lambda_{1} + 2\Lambda_{2})
Got:
    V(\Lambda_{1} + 2 \Lambda_{2})
**********************************************************************
1 item had failures:
   1 of   4 in 
sage.algebras.quantum_groups.quantum_group_gap.HighestWeightModule._latex_
    [529 tests, 1 failure, 10.26 s]
----------------------------------------------------------------------
sage -t --long --warn-long 230.6 
--random-seed=55945959185617375554737887082041268498 
src/sage/algebras/quantum_groups/quantum_group_gap.py  # 1 doctest failed
----------------------------------------------------------------------
Total time for all tests: 10.4 seconds
    cpu time: 8.6 seconds
    cumulative wall time: 10.3 seconds
Features detected for doctesting: 
Pytest is not installed, skip checking tests that rely on it.

Appears to be purely cosmetic.

charpent@zen-book-flip:/usr/local/sage-9$ sage -t --long --warn-long 230.6 
--random-seed=55945959185617375554737887082041268498 
src/sage/functions/min_max.py  # 2 doctests failed
Running doctests with ID 2022-01-10-17-59-37-1c60f093.
Git branch: develop
Using 
--optional=build,debian,debugpy,dot2tex,fricas,gap_packages,libsemigroups,pip,sage,sage_spkg
Features to be detected: 
4ti2,benzene,bliss,buckygen,conway_polynomials,csdp,database_cremona_ellcurve,database_cremona_mini_ellcurve,database_jones_numfield,database_knotinfo,dvipng,ffmpeg,graphviz,imagemagick,jupymake,kenzo,latte_int,lrslib,mcqd,meataxe,pandoc,pdf2svg,plantri,pynormaliz,rubiks,sage.combinat,sage.geometry.polyhedron,sage.graphs,sage.plot,sage.rings.number_field,sage.rings.real_double,sage.symbolic,sage_numerical_backends_coin,sagemath_doc_html,sphinx,tdlib
Doctesting 1 file.
sage -t --long --warn-long 230.6 
--random-seed=55945959185617375554737887082041268498 
src/sage/functions/min_max.py
**********************************************************************
File "src/sage/functions/min_max.py", line 236, in 
sage.functions.min_max.MaxSymbolic._evalf_
Failed example:
    r
Expected:
    sqrt(2) - cos(1)
Got:
    0.873911256505000
**********************************************************************
File "src/sage/functions/min_max.py", line 238, in 
sage.functions.min_max.MaxSymbolic._evalf_
Failed example:
    r.n()
Expected:
    0.873911256504955
Got:
    0.873911256505000
**********************************************************************
1 item had failures:
   2 of  11 in sage.functions.min_max.MaxSymbolic._evalf_
    [69 tests, 2 failures, 1.15 s]
----------------------------------------------------------------------
sage -t --long --warn-long 230.6 
--random-seed=55945959185617375554737887082041268498 
src/sage/functions/min_max.py  # 2 doctests failed
----------------------------------------------------------------------
Total time for all tests: 1.2 seconds
    cpu time: 1.3 seconds
    cumulative wall time: 1.1 seconds
Features detected for doctesting: 
Pytest is not installed, skip checking tests that rely on it.

Numerical noise ?

HTH,
​
Le dimanche 9 janvier 2022 à 12:15:23 UTC+1, 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
>
> 38323507f6 (tag: 9.5.rc0, trac/develop) Updated SageMath version to 9.5.rc0
> 464e8c3d08 Trac #33104: Fix references to `doc-clean`
> 22001aa722 Trac #32759: ./configure --disable-doc
> d5d2b5b0ed Trac #32860: Inaccurate documentation for number field 
> elements_of_norm
> e0ffa0f92d Trac #33097: some typos in combinat and modular
> 396023cf78 Trac #33087: build/bin/sage-clone-source: Use "trac" as name of 
> the remote
> 771546ff82 Trac #33046: gap spkg creates absolute symlinks
> be94896c70 Trac #32990: pickling support for real balls and related objects
> 81cc1a8156 Trac #32977: sage.features: Remove dependency on 
> sage.misc.lazy_string
> 0cb2c8e457 Trac #32938: deactivation of the u-prefix doctest handler
> c1f5a61578 Trac #32245: Quaternion ideals sometimes compare incorrectly
> 969746aadc Trac #30875: Random elements of AA aren't random
> fe53f67ecd Trac #29784: Update section "Sage Development Process" in 
> Developer's Guide
> 52f8223178 Trac #33080: Fix scipy-1.7.2 build failure on Cygwin
> 3bd8aedeb2 Trac #32868: configure tarball misses some generated files
> 283fef85db Trac #33036: random doctest failure in src/sage/crypto/util.py
> b0b05d9493 Trac #32980: unmarked # long time tests in 
> graphs/generators/classical_geometries.py
> 4990807a40 Trac #32972: Unmarked # long time tests in 
> characteristic_cohomology_class.py
> 4929c5dd64 Trac #32971: unmarked # long time tests in ell_number_field.py
> 40a9c26056 Trac #30677: Add VS Code config for SAGE_ROOT/venv
> e78700a067 Trac #33068: GH Actions: Remove ubuntu-groovy
> 1100bbaade Trac #33058: doctest in generic_graph.py can fail due to 
> rounding error
> 7155edaef4 Trac #33019: remove more py2 or py3 tags in doctests
> 897e8e6d21 Trac #33031: add tolerance to is_hermitian() for sparse 
> "double" matrices
> 7c823e63ad Trac #32904: Add version constraints for sage-conf, clean the 
> sage-conf sdist
> 9fb5ea945f Trac #31672: Invalid latex repr from FreeAlgebra _latex_ / 
> repr_lincomb
> d6ac8199bc Trac #32062: GH Actions: Deploy sdists to PyPI
> 646bd9f4a8 Trac #33066: OpenSSL 3.0.1 security update
> c4f76c053f Trac #32703: GH Actions (macOS): Run a job for "make 
> build-local" first, cache image for job "make build"
> 039a909b6f Trac #32113: GH Actions: conda-forge tests broken
> 935315f002 Trac #30766: Experimental support for Python 3.10 in Sage 9.5
> a34b9801ab Trac #33057: fix incorrect doctest in solve_integer of binary 
> quadratic forms
> 3273e8aff6 Trac #33067: tox / GH Actions: Fix docker-based tests after 
> #31386
> bd2a8371f0 Trac #29039: pip-installable version of package sage_conf - 
> installs non-Python bits of the Sage distribution in ~/.sage/
> 0cd457a745 Trac #33082: segfault: illegal (popcnt) instruction in 
> primecount
> cd124899d0 Trac #33073: Segmentation fault in face iterator (still)
> da90b23cc9 Trac #29310: "make distclean" should not run "./configure"
> c9093db43b Trac #13637: Add multiplicative order to complex interval field
> fd0fbb9118 Trac #33040: Update matplotlib to 3.5
> 31d2b1c069 Trac #33012: Bug in bitset_copy_flex
> 02e8c4cca0 Trac #32676: logic.print_table changes your truthtable
> c2810fce48 Trac #31580: Update matplotlib to 3.4
> 6fac484bc0 Trac #33060: pytest: Declare dependencies
> 599ced4e9f Trac #33059: conda-forge-macos-standard: pyzmq build fails
> 13a6210d75 Trac #33043: Upgrade: lcalc 2.0.5 to allow building on Cygwin
> e39ff7d436 Trac #33042: givaro spkg-configure: Reject too new versions
> 2f510446d6 Trac #32907: Update singular to 4.2.1p3
> c5af19568c (tag: 9.5.beta9) Updated SageMath version to 9.5.beta9
>

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