With 9.1.beta2, I frequently see the following transient failure on my
patchbot
<https://patchbot.sagemath.org/log/0/Linux/1_SMP_Fri_Dec_6_15:49:49_UTC_2019/x86_64/3.10.0-1062.9.1.el7.x86_64/r640/2020-01-29%2009:16:19>
running on CentOS 7.7:
File "src/sage/schemes/elliptic_curves/isogeny_small_degree.py", line 2173,
in sage.schemes.elliptic_curves.isogeny_small_degree.
isogenies_prime_degree_general
Failed example:
len(E.change_ring(GF(3^2,'a')).isogenies_prime_degree(13))
Exception raised:
Traceback (most recent call last):
File
"/amd/compute/sagebot/sage/local/lib/python3.7/site-packages/sage/doctest/forker.py"
, line 681, in _run
self.compile_and_execute(example, compiler, test.globs)
File
"/amd/compute/sagebot/sage/local/lib/python3.7/site-packages/sage/doctest/forker.py"
, line 1123, in compile_and_execute
exec(compiled, globs)
File "<doctest
sage.schemes.elliptic_curves.isogeny_small_degree.isogenies_prime_degree_general[22]>"
, line 1, in <module>
len(E.change_ring(GF(Integer(3)**Integer(2),'a')).
isogenies_prime_degree(Integer(13)))
File
"/amd/compute/sagebot/sage/local/lib/python3.7/site-packages/sage/schemes/elliptic_curves/ell_field.py"
, line 1092, in isogenies_prime_degree
return sum([isogenies_prime_degree(self, d) for d in L], [])
File
"/amd/compute/sagebot/sage/local/lib/python3.7/site-packages/sage/schemes/elliptic_curves/ell_field.py"
, line 1092, in <listcomp>
return sum([isogenies_prime_degree(self, d) for d in L], [])
File
"/amd/compute/sagebot/sage/local/lib/python3.7/site-packages/sage/schemes/elliptic_curves/isogeny_small_degree.py"
, line 2360, in isogenies_prime_degree
return isogenies_prime_degree_general(E,l, minimal_models=
minimal_models)
File
"/amd/compute/sagebot/sage/local/lib/python3.7/site-packages/sage/schemes/elliptic_curves/isogeny_small_degree.py"
, line 2249, in isogenies_prime_degree_general
factors.remove(f)
ValueError: list.remove(x): x not in list
This happens only rarely when testing the file standalone. I have opened
#29107 <https://trac.sagemath.org/ticket/29107> for this.
Also, the directory `build/pkgs/sage_conf/src/` contains untracked
autogenerated files. This makes `configure` fail if one tries to checkout a
previous beta.
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