On Tue, Sep 11, 2018 at 11:34 AM Erik Bray <erik.m.b...@gmail.com> wrote: > > 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.
I think it might be something similar to this issue: https://bugs.python.org/issue14548 The exact details aren't clear to me yet, but if you fork in the middle of a garbage collection cycle (quite likely in the sage.parallel.map_reduce module which is why this happens to be appearing there), I suppose you could end up in some fork-unsafe state. -- You received this message because you are subscribed to the Google Groups "sage-release" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-release+unsubscr...@googlegroups.com. To post to this group, send email to sage-release@googlegroups.com. Visit this group at https://groups.google.com/group/sage-release. For more options, visit https://groups.google.com/d/optout.
