Random timeout in rings/test

[tobiasdiez]

          The failure is an unrelated timeout. Something very strange is happening, I was able to kind of reproduce this as follows:

$ sage -tp 16 --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py{,,,,,,,}{,}
too many failed tests, not using stored timings
Running doctests with ID 2023-11-26-21-39-35-a86f2520.
Running with SAGE_LOCAL='/usr' and SAGE_VENV='/usr'
Using --optional=pip,sage
Features to be detected: 4ti2,benzene,bliss,buckygen,conway_polynomials,csdp,cvxopt,cvxopt,database_cremona_ellcurve,database_cremona_mini_ellcurve,database_cubic_hecke,database_jones_numfield,database_knotinfo,dvipng,fpylll,gap_package_atlasrep,gap_package_design,gap_package_grape,gap_package_guava,gap_package_hap,gap_package_polycyclic,gap_package_qpa,gap_package_quagroup,gfan,graphviz,imagemagick,ipython,jupymake,kenzo,latte_int,lrcalc_python,lrslib,mcqd,meataxe,mpmath,msolve,nauty,networkx,numpy,palp,pandoc,pdf2svg,pdftocairo,pexpect,phitigra,pillow,plantri,polytopes_db,polytopes_db_4d,pplpy,primecountpy,ptyprocess,pynormaliz,pyparsing,python_igraph,requests,rubiks,sage.combinat,sage.geometry.polyhedron,sage.graphs,sage.groups,sage.libs.ecl,sage.libs.flint,sage.libs.gap,sage.libs.linbox,sage.libs.m4ri,sage.libs.ntl,sage.libs.pari,sage.libs.singular,sage.misc.cython,sage.modular,sage.modules,sage.numerical.mip,sage.plot,sage.rings.complex_double,sage.rings.finite_rings,sage.rings.function_field,sage.rings.number_field,sage.rings.padics,sage.rings.polynomial.pbori,sage.rings.real_double,sage.rings.real_mpfr,sage.sat,sage.schemes,sage.symbolic,sage_numerical_backends_coin,sagemath_doc_html,scipy,singular,sphinx,sympy,tdlib
Doctesting 16 files using 16 threads.
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 21.60 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 26.92 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 30.49 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 29.89 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 30.73 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 33.24 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 34.18 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 33.80 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 35.24 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 35.11 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 41.31 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 42.23 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 42.29 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 48.41 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 48.93 s]
sage -t --long --random-seed=286735480429121101562228604801325644303 src/sage/rings/tests.py
    [62 tests, 212.75 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------
Total time for all tests: 215.0 seconds
    cpu time: 494.5 seconds
    cumulative wall time: 747.1 seconds
Features detected for doctesting: sage.modules,sage.rings.finite_rings,sage.rings.number_field,sage.rings.padics,sage.symbolic

Originally posted by @tornaria in #36769 (comment)

[tobiasdiez]

Most likely duplicate of #35715