2022-01-19 00:05:13 UTC, Volker Braun on sage-release:
>
> 8ea92d580a (tag: 9.5.rc3, trac/develop) Updated SageMath version to 
9.5.rc3

On Ubuntu 21.10, the build succeeded but 5 doctests
failed in `src/sage/modules/free_module_integer.py`.

I don't know whether that failure is already tracked.
Can anybody point to an existing ticket? Otherwise
I can open one.  Details below.   --Samuel

-----

Failure summary:
```
$ make -s V=0 testlong
...
----------------------------------------------------------------------
sage -t --long --warn-long 127.1 
--random-seed=243861417107614574365038834487998971463 
src/sage/modules/free_module_integer.py  # 5 doctests failed
----------------------------------------------------------------------
Total time for all tests: 11153.8 seconds
    cpu time: 9705.7 seconds
    cumulative wall time: 10720.0 seconds
Features detected for doctesting: 
4ti2,dvipng,ffmpeg,graphviz,imagemagick,lrslib,pandoc,pdf2svg,sage.combinat,sage.geometry.polyhedron,sage.graphs,sage.plot,sage.rings.number_field,sage.rings.real_double,sage.symbolic,sagemath_doc_html,sphinx
Pytest is not installed, skip checking tests that rely on it.
make: *** [Makefile:242: testlong] Error 1
```

The failure persists when testing that file again.

```
$ SEED=243861417107614574365038834487998971463
$ alias sagetest="./sage -t --long --warn-long 128 --random-seed=$SEED"
$ sagetest src/sage/modules/free_module_integer.py  # 5 doctests failed
Running doctests with ID 2022-01-23-22-42-46-e3b619c7.
Git branch: develop
Using --optional=build,debian,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 128.0 
--random-seed=243861417107614574365038834487998971463 
src/sage/modules/free_module_integer.py
**********************************************************************
File "src/sage/modules/free_module_integer.py", line 213, in 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer
Failed example:
    L.shortest_vector()
Exception raised:
    Traceback (most recent call last):
      File "sage/misc/cachefunc.pyx", line 1943, in 
sage.misc.cachefunc.CachedMethodCaller.__call__ 
(build/cythonized/sage/misc/cachefunc.c:10347)
        return cache[k]
    KeyError: ((True, 'fplll'), ())

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/doctest/forker.py",
 
line 694, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/doctest/forker.py",
 
line 1088, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer[2]>", 
line 1, in <module>
        L.shortest_vector()
      File "sage/misc/cachefunc.pyx", line 1948, in 
sage.misc.cachefunc.CachedMethodCaller.__call__ 
(build/cythonized/sage/misc/cachefunc.c:10483)
        w = self._instance_call(*args, **kwds)
      File "sage/misc/cachefunc.pyx", line 1824, in 
sage.misc.cachefunc.CachedMethodCaller._instance_call 
(build/cythonized/sage/misc/cachefunc.c:9949)
        return self.f(self._instance, *args, **kwds)
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/modules/free_module_integer.py",
 
line 591, in shortest_vector
        w = vector(ZZ, SVP.shortest_vector(L, *args, **kwds))
      File "src/fpylll/fplll/svpcvp.pyx", line 77, in 
fpylll.fplll.svpcvp.shortest_vector
      File "src/fpylll/fplll/bkz_param.pyx", line 269, in 
fpylll.fplll.bkz_param.load_strategies_json
    RuntimeError: Aborted
**********************************************************************
File "src/sage/modules/free_module_integer.py", line 563, in 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer.shortest_vector
Failed example:
    L.shortest_vector().norm().n()
Exception raised:
    Traceback (most recent call last):
      File "sage/misc/cachefunc.pyx", line 1943, in 
sage.misc.cachefunc.CachedMethodCaller.__call__ 
(build/cythonized/sage/misc/cachefunc.c:10347)
        return cache[k]
    KeyError: ((True, 'fplll'), ())

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/doctest/forker.py",
 
line 694, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/doctest/forker.py",
 
line 1088, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer.shortest_vector[4]>",
 
line 1, in <module>
        L.shortest_vector().norm().n()
      File "sage/misc/cachefunc.pyx", line 1948, in 
sage.misc.cachefunc.CachedMethodCaller.__call__ 
(build/cythonized/sage/misc/cachefunc.c:10483)
        w = self._instance_call(*args, **kwds)
      File "sage/misc/cachefunc.pyx", line 1824, in 
sage.misc.cachefunc.CachedMethodCaller._instance_call 
(build/cythonized/sage/misc/cachefunc.c:9949)
        return self.f(self._instance, *args, **kwds)
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/modules/free_module_integer.py",
 
line 591, in shortest_vector
        w = vector(ZZ, SVP.shortest_vector(L, *args, **kwds))
      File "src/fpylll/fplll/svpcvp.pyx", line 77, in 
fpylll.fplll.svpcvp.shortest_vector
      File "src/fpylll/fplll/bkz_param.pyx", line 269, in 
fpylll.fplll.bkz_param.load_strategies_json
    RuntimeError: Aborted
**********************************************************************
File "src/sage/modules/free_module_integer.py", line 618, in 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer.update_reduced_basis
Failed example:
    v = L.shortest_vector(update_reduced_basis=False)
Exception raised:
    Traceback (most recent call last):
      File "sage/misc/cachefunc.pyx", line 1943, in 
sage.misc.cachefunc.CachedMethodCaller.__call__ 
(build/cythonized/sage/misc/cachefunc.c:10347)
        return cache[k]
    KeyError: ((False, 'fplll'), ())

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/doctest/forker.py",
 
line 694, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/doctest/forker.py",
 
line 1088, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer.update_reduced_basis[4]>",
 
line 1, in <module>
        v = L.shortest_vector(update_reduced_basis=False)
      File "sage/misc/cachefunc.pyx", line 1948, in 
sage.misc.cachefunc.CachedMethodCaller.__call__ 
(build/cythonized/sage/misc/cachefunc.c:10483)
        w = self._instance_call(*args, **kwds)
      File "sage/misc/cachefunc.pyx", line 1824, in 
sage.misc.cachefunc.CachedMethodCaller._instance_call 
(build/cythonized/sage/misc/cachefunc.c:9949)
        return self.f(self._instance, *args, **kwds)
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/modules/free_module_integer.py",
 
line 591, in shortest_vector
        w = vector(ZZ, SVP.shortest_vector(L, *args, **kwds))
      File "src/fpylll/fplll/svpcvp.pyx", line 77, in 
fpylll.fplll.svpcvp.shortest_vector
      File "src/fpylll/fplll/bkz_param.pyx", line 269, in 
fpylll.fplll.bkz_param.load_strategies_json
    RuntimeError: Aborted
**********************************************************************
File "src/sage/modules/free_module_integer.py", line 619, in 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer.update_reduced_basis
Failed example:
    L.update_reduced_basis(v)
Exception raised:
    Traceback (most recent call last):
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/doctest/forker.py",
 
line 694, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/opt/s/sage-9-5-c3-fresh-clone/local/var/lib/sage/venv-python3.9/lib/python3.9/site-packages/sage/doctest/forker.py",
 
line 1088, in compile_and_execute
        exec(compiled, globs)
      File "<doctest 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer.update_reduced_basis[5]>",
 
line 1, in <module>
        L.update_reduced_basis(v)
    NameError: name 'v' is not defined
**********************************************************************
File "src/sage/modules/free_module_integer.py", line 620, in 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer.update_reduced_basis
Failed example:
    bool(L.reduced_basis[0].norm() < B[0].norm())
Expected:
    True
Got:
    False
**********************************************************************
3 items had failures:
   1 of   4 in 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer
   1 of  11 in 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer.shortest_vector
   3 of   8 in 
sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer.update_reduced_basis
    [109 tests, 5 failures, 18.48 s]
----------------------------------------------------------------------
sage -t --long --warn-long 128.0 
--random-seed=243861417107614574365038834487998971463 
src/sage/modules/free_module_integer.py  # 5 doctests failed
----------------------------------------------------------------------
Total time for all tests: 18.6 seconds
    cpu time: 18.5 seconds
    cumulative wall time: 18.5 seconds
Features detected for doctesting: 
Pytest is not installed, skip checking tests that rely on it.
$ 
```

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