Bug#991750: nauty: segfaults during sagemath testsuite

[Torrance, Douglas]

Control: forwarded -1 nauty at anu.edu.au

FYI, the segfault below was just reported in Debian.

On Sat, 31 Jul 2021 21:11:10 +0200 (CEST) Ahzo <ahzo at tutanota.com> wrote:
> Package: nauty
> Version: 2.7r1+ds-2
> Severity: important
> Control: affects -1 sagemath
> 
> Hi,
> 
> during the sagemath testsuite, a nauty crash occurs. Nonetheless, the sagemath test passes:
> sage -t --long --random-seed=0 src/sage/graphs/digraph_generators.py
> Â Â Â  [150 tests, 6.44 s]
> 
> The crash can be easily reproduced:
> $ nauty-gentourng -d0 -D1 -c 2
> >A nauty-gentourng -cd1D0 n=2
> Segmentation fault (core dumped)
> 
> Anyway, nauty should not crash like this, particularly since the input seems valid.
> 
> Regards,
> Ahzo