#10963: More functorial constructions
-------------------------------------+-------------------------------------
Reporter: nthiery | Owner: stumpc5
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.1
Component: categories | Resolution:
Keywords: days54 | Merged in:
Authors: Nicolas M. Thiéry | Reviewers: Simon King, Frédéric
Report Upstream: N/A | Chapoton
Branch: | Work issues: Detect and fix
public/ticket/10963 | Heisenbugs
Dependencies: #11224, #8327, | Commit:
#10193, #12895, #14516, #14722, | 5ccf253b17c151d8e773037ac634a64f84f03075
#13589, #14471, #15069, #15094, | Stopgaps:
#11688, #13394, #15150, #15506 |
-------------------------------------+-------------------------------------
Comment (by vbraun):
Here is another stab at debugging this: Put an `abort()` in
`PyErr_WriteUnraisable` to just die and let gdb produce a backtrace where
an exception would be ignored. See attachment. Then recompile Python,
Cython, and the Sage library with `CFLAGS='-O0 -g3'` for good measure.
The first surprise is that this always hits `PyErr_WriteUnraisable` when
quitting Sage, its only that printing the message is disabled while Python
shuts down (stderr == None). So skip over that, too.
Then force a failure by running
{{{
sage -btp --long --global-iterations=100 src/sage/combinat/species/
}}}
for a while. Stack backtrace of the eventual failure is at
http://boxen.math.washington.edu/home/vbraun/logs/crash_functorial_constructions.log
--
Ticket URL: <http://trac.sagemath.org/ticket/10963#comment:241>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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