On Tue, Sep 11, 2018 at 11:08 AM Erik Bray <erik.m.b...@gmail.com> wrote:
>
> On Fri, Sep 7, 2018 at 1:24 AM Volker Braun <vbraun.n...@gmail.com> 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
>
> On Cygwin `make ptestlong` with 4 processes gave me a few random
> failures.  I have a lot of browser tabs open so I'm getting a lot of
> spurious
>
>      ***   Warning: not enough memory, new PARI stack 8545042432
>
> warnings as the cause for most of the random failures.  I really need
> to figure out how to disable that message for good.
>
> But I also got this failure again:
>
>     sage -t --long --warn-long 168.0 src/sage/parallel/map_reduce.py
>     **********************************************************************
>     File "src/sage/parallel/map_reduce.py", line 281, in
> sage.parallel.map_reduce
>     Failed example:
>         st = pstats.Stats(prof+'0')
>     Expected nothing
>     Got:
>         Exception AssertionError: AssertionError('TripleDictEraser:
> key match but no weakref match',) in
> <sage.structure.coerce_dict.TripleDictEraser object at 0x6fffe90ef68>
> ignored
>     **********************************************************************
>     1 item had failures:
>        1 of  48 in sage.parallel.map_reduce
>         [300 tests, 1 failure, 68.01 s]
>
> Last time I saw this I could never manage to reproduce this, but there
> it is again in the exact same place before, so it's at least not
> completely random.

Well, I can reproduce this reliably now by running

    SAGE_NUM_THREADS=2 ./sage -t --long src/sage/parallel/map_reduce.py

without the SAGE_NUM_THREADS=2 it doesn't happen.

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