#13864: Configure Python with pydebug when SAGE_DEBUG is set
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Reporter: jpflori | Owner: jason
Type: enhancement | Status: positive_review
Priority: major | Milestone: sage-5.6
Component: misc | Resolution:
Keywords: python spkg | Work issues:
Report Upstream: N/A | Reviewers: Volker Braun
Authors: Jean-Pierre Flori | Merged in:
Dependencies: #13865 | Stopgaps:
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Comment (by vbraun):
Replying to [comment:17 SimonKing]:
> Interestingly, the error on my laptop looks different from what Volker
reported in comment:15:
> ...
> dlopen("/home/simon/SAGE/debug/sage-5.5.rc0/local/lib/python2.7/site-
packages/sage/rings/integer.so", 2);
> python: Modules/gcmodule.c:326: visit_decref: Assertion `gc->gc.gc_refs
!= 0' failed.
> ...
You die in a garbage collection cycle, presumably because you have < 32 GB
RAM (= my desktop). So the garbage collector runs earlier.
We both get killed by integer arithmetic, which points to a circular
import problem. The Integer class is a particularly bad case of stuff that
tries to define and compute everything upon import. At the same time it is
interleaved with the rationals class, so it is full of circular imports.
Which almost certainly equals half-constructed objects during the circular
import fest.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13864#comment:24>
Sage <http://www.sagemath.org>
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