On Dec 31, 10:38 am, Robert Bradshaw <rober...@math.washington.edu>
wrote:
> Is there a build somewhere on sage.math that I could copy and reproduce
> this with?

There is now:

sage.math.washington.edu:/scratch/nbruin/5.6b2

I've inserted a gc.collect() into TripleDictEraser.__call__ to
reliably produce a crash with

./sage -t devel/sage/sage/modules/module.pyx

Note that the crash happens quite a bit later than the double free. On
a debug build this gets detected a little closer to the source of the
problem (it gets noted that the refcount doesn't match upon GC-ing).

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