#14501: Fix memory allocation problems in data_structures_pyx.pxi
---------------------------------+------------------------------------------
Reporter: dcoudert | Owner: joyner
Type: defect | Status: new
Priority: major | Milestone: sage-5.10
Component: group theory | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: David Coudert | Merged in:
Dependencies: | Stopgaps:
---------------------------------+------------------------------------------
Description changed by dcoudert:
Old description:
> While testing patch #13961, I raised a memory allocation problem in file
> {{{data_structures_pyx.pxi}}}
>
> More precisely, the following test causes a segfault on my computer
> {{{
> sage: G = graphs.CompleteGraph(10)
> sage: GG = G.line_graph().line_graph().line_graph()
> sage: H = GG.relabel(inplace=False)
> sage: GG.is_isomorphic(H)
> ...
> sage: line 135: 3438 Segmentation fault (core dumped)
> "$SAGE_ROOT/spkg/bin/sage" "$@"
> }}}
> Tracking the segfault, I ended up in the {{{SC_new}}} of
> {{{sage/groups/perm_gps/partn_ref/data_structures_pyx.pxi}}}
>
> This patch fix some assignments performed before testing memory
> allocations and other similar stuff, but not the entire issue.
New description:
The following test causes a segfault on my computer (Intel(R) Xeon(R) CPU
W3520 @ 2.67GHz / 4GB ram / linux)
{{{
sage: G = graphs.CompleteGraph(10)
sage: GG = G.line_graph().line_graph().line_graph()
sage: H = GG.relabel(inplace=False)
sage: GG.is_isomorphic(H)
...
sage: line 135: 3438 Segmentation fault (core dumped)
"$SAGE_ROOT/spkg/bin/sage" "$@"
}}}
Tracking the segfault, I ended up in the {{{SC_new}}} of
{{{sage/groups/perm_gps/partn_ref/data_structures_pyx.pxi}}}
This patch fix some assignments performed before testing memory
allocations and other similar stuff, but does not fix my problem.
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14501#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.
