What I find in common for the 7 failures is:
"/home/rllozes/sage-9.3/local/lib/libopenblas.so.0(zgemm_kernel_n+0x9d)[0x7f2b0f8c549d]",
 
and further
"0x00007f2b0f8c549d in zgemm_kernel_n () at 
../kernel/x86_64/zgemm_kernel_1x4_nehalem.S:214"
indicating an openblas error. 
The install.log shows that we built openblas with correct detection of AVX 
(yes), AVX2 (no), and AVX-512 (no), which was once a common root cause for 
openblas failures (ca. 2012). OTOH, the system already supplies an openblas 
in /usr/lib64, which configure did not find. 

On Monday, May 17, 2021 at 2:32:59 AM UTC-7 dim...@gmail.com wrote:

> On Sun, May 16, 2021 at 4:26 PM Richard_L <rich...@lozestech.com> wrote:
> >
> > 'make ptestlong' gave the following error summary on a new build from 
> source:
> >
> > ----------------------------------------------------------------------
> > sage -t --long --warn-long 103.3 --random-seed=0 
> src/sage/calculus/riemann.pyx # Killed due to illegal instruction
>
>
> this kind of error indicates that a component is using CPU
> instructions not understood by your CPU.
> It could be either something you installed from the system, or
> something that you built from source as a part of Sage.
> You can look in logs/ptestlong.log to locate more precise errors/stack 
> dumps.
>
>
>
>
> > sage -t --long --warn-long 103.3 --random-seed=0 
> src/sage/schemes/riemann_surfaces/riemann_surface.py # Killed due to 
> illegal instruction
> > sage -t --long --warn-long 103.3 --random-seed=0 
> src/sage/matrix/matrix2.pyx # Killed due to illegal instruction
> > sage -t --long --warn-long 103.3 --random-seed=0 
> src/sage/misc/functional.py # Killed due to illegal instruction
> > sage -t --long --warn-long 103.3 --random-seed=0 
> src/sage/calculus/interpolators.pyx # Killed due to illegal instruction
> > sage -t --long --warn-long 103.3 --random-seed=0 
> src/sage/matrix/matrix_double_dense.pyx # Killed due to illegal instruction
> > sage -t --long --warn-long 103.3 --random-seed=0 
> src/sage/schemes/affine/affine_homset.py # Killed due to illegal instruction
> > sage -t --long --warn-long 103.3 --random-seed=0 
> src/sage/modular/modform/numerical.py # Killed due to illegal instruction
> > ----------------------------------------------------------------------
> > Total time for all tests: 3514.1 seconds
> > cpu time: 22425.1 seconds
> > cumulative wall time: 27133.4 seconds
> > make: *** [Makefile:201: ptestlong] Error 16
> >
> > I allowed the package to build Python 3.9.2. The OS is openSUSE Leap 
> 15.2. There were 8 threads active during testing.
> >
> > --
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> .
>

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