I've seen this randomly, too. I don't think its a pickling issue. Its a 
combination of

#23453: adds runtime-check that the parent is not None
#23204: adds the doctest in fraction_field_FpT.pyx that randomly fails

Though I can't reproduce it. See if you can; if so it would be easy to 
debug.



On Sunday, July 30, 2017 at 11:06:05 AM UTC+2, [email protected] wrote:
>
> Thanks for all your work, Volker.
>
> Several patchbots report failures in "sage -t --long 
> src/sage/rings/fraction_field_FpT.pyx  # 3 doctests failed". This is 
> apparently a pickling issue.
>
> For example, see
>
>
> https://patchbot.sagemath.org/log/17093/LinuxMint/18.1/x86_64/4.4.0-83-generic/rk02-math/2017-07-30%2004:58:01?short
>
> Frederic
>
> Le dimanche 30 juillet 2017 10:53:46 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
>>
>>
>> 38f662f Updated SageMath version to 8.1.beta0
>> 19f48ef Trac #23411: Fix pickling of matrix_gfpn_dense
>> f15aa1f Trac #23383: Speeding up congruence-related lattice functions
>> cb44570 Trac #23204: Remove RingHomomorphism_coercion
>> 3c539ee Trac #23028: Cannot construct module generator for A2 dual KR 
>> crystals
>> 84f4bec Trac #22605: Better error handling of the polyhedron constructor 
>> for non-embedded NumberField and floats.
>> 0f7f765 Trac #20138: Information set decoding for linear codes
>> b2f4c27 Trac #12657: Better implementation of Frobenius automorphism
>> 175e067 Trac #23523: Fix subtraction of affine/loop Lie algebra elements
>> 5421bde Trac #23453: Element._set_parent(): check that argument is a 
>> parent
>> bb3a29c Trac #23444: cleanup of sandpiles
>> cede2f9 Trac #23442: py3: removal of __cmp__ in poset elements
>> ee71b6e Trac #23440: Various Cython fixes to IndexedFreeModuleElement
>> 3683072 Trac #23439: Multisegments _sig does not return a triple when 
>> highest weight element
>> a807181 Trac #23433: Swap x and y in 
>> `AbstractLinearCode.weight_enumerator`
>> ed8ee20 Trac #23431: enhancements to free pre-Lie algebras
>> 5b7c608 Trac #23413: Move various things to src/sage/cpython
>> 42f4708 Trac #23409: py3: remove some cmp in doc of pyx files
>> cb89e26 Trac #23407: Don't link C modules with -lstdc++
>> 54665cd Trac #23405: Upgrading experimental GAP3 package to version 
>> 04jul17
>> 7703933 Trac #23404: Implement wrapperdescr_call without checking
>> 3c72b78 Trac #23394: Fix script example in the programming tutorial
>> ac2f540 Trac #23392: Wrong certificate from is_relatively_complemented
>> 1ba6854 Trac #23390: Show method of semidefinite programming does no 
>> carriage return
>> 1c07756 Trac #23389: Some curation in semidefinite programming html doc
>> 138166d Trac #23388: faster floor for number field elements
>> ef20f8d Trac #23387: py3: fixing a new bad zip doctest
>> a453568 Trac #23385: py3: rich comparison for sage/structure
>> 9759ed2 Trac #23384: py3: rich comparison for root systems
>> d4445e3 Trac #23382: Clean up matroid constructor
>> 2914a76 Trac #23235: Fast p-adic exponential
>> 6632ec1 Trac #22211: Upgrade prompt_toolkit to 1.0.9
>> 4602a83 Trac #23370: py3: cmp in schemes : divisor_group and abstract 
>> jacobian
>> 6fc7f50 Trac #23367: py3 : rich comparison for the groups
>> d41e3d8 Trac #23366: py3: cmp in continued fractions / Klyachko sheaves / 
>> coxeter3
>> c66d7bd Trac #23364: More Sphinx 1.5 fixes
>> 4ade915 Trac #23360: Upgrade to Cython 0.26
>> e193a6b Trac #23357: upgrade gf2x to version 1.2
>> beda263 Trac #23354: numerical noise in libs/lcalc/lcalc_Lfuntion.pyx 
>> with clang-4 and icc
>> caf0485 Trac #23351: Random failure in a cryptominisat optional doctest 
>> in boolean_polynomials.solve
>> 083fc6d Trac #23347: The decomposition of a Dyck word into prime factors
>> 1d3b0e6 Trac #23345: conversion for fractions
>> da09577 Trac #23343: Clean up SpecializationMorphism
>> 0ef6292 Trac #23338: Clean up polynomial constructor
>> 3a7528f Trac #23337: Use variable names instead of symbolic variables
>> e4c0af6 Trac #15585: Random failure in SimplicialComplex.is_cohen_macaulay
>> 96cfc9e Trac #23322: py3: richcmp for modular symbols
>> 3314255 Trac #23318: clean up the file misc/functional.py
>> 9f435bc Trac #23300: non-absolute import in BasisExchangeMatroid
>> 8cddaba Trac #23238: New syntax for GlobalOptions
>> 16496f9 Trac #23228: Fix modulo operator for unramified floating point 
>> elements
>> eae14dc Trac #23207: Exterior powers of free modules of finite rank
>> 5157d17 Trac #23192: some_elements is trivial for orders/number fields
>> d987d7f Trac #23046: Patch python to allow linking with clang on linux
>> d9936cc Trac #22889: Replace 'if x != False' with 'if x', etc.
>> 78fa1e3 Trac #22564: Chromatic index
>> 7b82f7f Trac #22462: Use ContainChildren to implement p_iter_fork
>> 1062abdf Trac #22103: Printing p-adic numbers
>> a3befda Trac #21996: Factorization in iterated extensions of finite fields
>> 4d6ff57 Trac #20244: root_field() does not work for p-adic fields
>> f647e6c Trac #20073: p-adic extensions with non-monic polynomials
>> fd9d65f Trac #17968: Wrong integral of exp(x^3) from 1 to 2.
>> 9a8eff9 Trac #16949: Improve gens() for elliptic curves over a finite 
>> field
>> b9a6660 Trac #11960: bug in matrix of frobenius when p = 3
>> 9196740 Trac #10680: deal with BooleanMonomialMonoid in polynomial 
>> sequences
>> 973d939 Trac #6592: minimize_constrained only takes lambda functions as 
>> constraints
>> 823a4d2 Trac #23153: Bug in finite field element GAP-to-Sage conversion 
>> when explicit field is specified
>> 40ef15f Trac #23097: Maxima leaves a ton of compiled lips DLLs from ECL 
>> in /tmp when running tests
>> 74b0302 Updated SageMath version to 8.0
>>
>>

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