On Gentoo, incremental build from beta12 -> beta13, I see the following 
failure

sage -t --long --warn-long 209.7 --random-seed=0 
src/sage/interfaces/singular.py  # Killed due to segmentation fault

which is identical to the failure on ubuntu-groovy with beta12

https://github.com/sagemath/sage/runs/1078907777

The Cython backtrace starts as

Cython backtrace
----------------
#0  0x00007f2640f8daa0 in wait4 ()
#1  0x00007f2637f989ed in print_enhanced_backtrace ()
#2  0x00007f2637f98b89 in sigdie ()
#3  0x00007f2637f97f1c in sigdie_for_sig ()
#4  0x00007f2637f980b4 in cysigs_signal_handler ()
#5  0x0000000000000000 in ?? ()
#6  0x00007f2512e72710 in __pyx_f_9cysignals_7signals_verify_exc_value ()
#7  0x00007f261f11e0f9 in sig_occurred () at 
/local/sage-git/sage/build/pkgs/sagelib/src/sage/graphs/base/boost_graph.pyx:0
     1    r"""
     2    Interface to run Boost algorithms
     3
     4    Wrapper for a Boost graph. The Boost graphs are Cython C++ 
variables, and they
#8  0x00007f261f11caa4 in fast_tp_dealloc () at 
/local/sage-git/sage/build/pkgs/sagelib/src/sage/rings/integer.pyx:0
     1    r"""
     2    Elements of the ring `\ZZ` of integers
     3
     4    Sage has highly optimized and extensive functionality for 
arithmetic with integers
#9  0x00007f26412ebe40 in _PyEval_EvalFrameDefault ()
#10 0x00007f26413c8ab0 in _PyEval_EvalCodeWithName ()
#11 0x00007f26413c95d0 in PyEval_EvalCodeEx ()
#12 0x00007f26413c9620 in PyEval_EvalCode ()

The doctest always fails when run individually; although, occasionally it 
will pass when run from the full testsuite.
On Monday, September 21, 2020 at 4:31:17 PM UTC-6 Volker Braun wrote:

> 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 
>
> Again, if there is anything that should be merged in this beta cycle then 
> a positively-reviewed patch has to materialize real soon ;-)
>
> 468f23815a (tag: 9.2.beta13, trac/develop) Updated SageMath version to 
> 9.2.beta13
> 85a3dc5389 Trac #30600: fix ecm on macOS Xcode 12
> a7608327d4 Trac #30053: Python 3.7+: setlocale: LC_ALL: cannot change 
> locale (C.UTF-8) from build/bin/sage-spkg and in doctests; disable use of 
> system Python 3.6
> 99faab8cbe Trac #30593: gf2x build with Xcode 12
> 2e265be7d0 Trac #30594: ecl build with Xcode 12
> b66986d09b Trac #30491: add check parameter for lattice posets
> 114ee7373b Trac #30467: src/tox.ini: Check patchbot plugin patterns and 
> common typo patterns
> f2e15e2be5 Trac #30465: faster and memory efficient implementation of 
> Szeged index
> 868adde689 Trac #30444: Mention anonymous hyperlinks in developer doc
> ee5f4f3c6d Trac #30437: Special Implementation of random_element() for 
> Laurent Series Rings
> 2eebb6c71e Trac #30425: Upgrade: misc pip upgrades 2020-08: SymPy, pip, six
> fc5bfc7617 Trac #29363: At the end of configure, indicate which 
> optional/experimental packages are configured to be installed
> 87116edf2a Trac #28864: 17 internet doctest failing in findstat.py
> c58024ef03 Trac #30568: Fix computation of eigenvectors using arb
> 5e159a4298 Trac #30560: Make openssl an optional dependency of python3
> 6525ae113e Trac #30557: Add spkg-configure.m4 for openssl
> fda96c41ac Trac #28838: Resurrect "sage -sws2rst" via a pip-installable 
> package sage_sws2rst
> da78a68d07 Trac #30396: cygwin-standard: sagelib build fails
> d5b9e06998 Trac #30403: Standard package zlib cannot be installed on some 
> platforms, breaking Docker build
> 907912f7ff Trac #30405: Graphs: fast implementation to compute antipodal 
> graph
> 5adec5bd66 Trac #30329: Graphs: last unbounded diameter distance-regular 
> graphs
> 51ea8fa1cb Trac #30320: set_default_frame() too restrictive on 
> parallelizable manifolds
> e8c87f3cd3 Trac #30312: Graphs: more classical parameters distance regular 
> graphs
> 42f81f6f5c Trac #30275: Replace AssertionError with ValueError
> 57cd152782 Trac #30216: GH Actions: Test Windows with WSL
> 762de29268 Trac #30187: Words: improve `count` consistency across datatype 
> representation
> 0ffff2c41b Trac #30041: coefficients of a polynomial yielding an element 
> in an extension of a p-adic field
> dff7c61f3a Trac #29541: spkg-configure.m4 for giac
> 70ea8fedf0 Trac #28136: Add number_of_subgroups() method to AbelianGroup
> 395be93987 Trac #28012: py3: import certain things from collections.abc
> d9c15ae9c9 Trac #30550: conda-forge-ubuntu-standard: Pillow fails to 
> install
> d73ae6d0f4 Trac #30543: Document spkg-configure.m4 and distros directory
> 488f5076f7 Trac #30535: conda-forge-macos-standard: sagelib build fails 
> with linbox-related error
> 53cf5c2aed Trac #29743: is_unit() fails for power-series-ring element: 
> O(t^0)
> 72a76b31a5 Trac #28991: spkg-configure.m4 for gc
> 0e79ab3e4c Trac #28814: Conversion of scientific notation 
> floats/RDF,etc... incorrect in Mathematica interface
> 0192e3a95c Trac #11736: Linear time implementation of lex_BFS()
> f100b1886d Trac #30536: configure: No longer prefer gfortran-9; homebrew: 
> Recommend gcc instead of gcc@9
> 736554330f Trac #30519: Fix check of orientation in volume form
> cd65699176 Trac #30340: tox.yml (dist): Do not fail when the tag already 
> exists
> 07a863dd16 Trac #28022: Downgrade rubiks to optional
> 363f8586eb Trac #16809: leak in maxima interface
> 5ec24db181 (tag: 9.2.beta12) Updated SageMath version to 9.2.beta12
>
>

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