[Graph Libraries] Segmentation fault when gvLayout() called after gvFreeLayout()

[GadgetSteve]

Ported Issue from Mantis
Original ID: 2467
Reported By: stvdedal

SEVERITY: MINOR
Submitted: 2014-07-05 20:55:18

DESCRIPTION

verrsion: graphviz-2.30.1

Segmentation fault when gvLayout() called after gvFreeLayout()
See minimal example in "step to reproduce".

I need to relayout created graph again, so I do:

1. greate graph
2. gvLayout()
3. graph modifications: add/remove nodes or edges
4. gvFreeLayout()
5. gvLayout() <---- SIGSEG

STEPS TO REPRODUCE

1. minimal example:

================= gvLayout_SIGSEG.c ======================
#include <graphviz/cgraph.h>
#include <graphviz/gvc.h>

int main(int argc, char** argv)
{
    GVC_t* gvc = gvContext();

    Agraph_t* g1 = agopen("g1", Agundirected, NULL);
    agnode(g1, "n1", 1);
    agnode(g1, "n2", 1);

    gvFreeLayout(gvc, g1);
    gvLayout(gvc, g1, "dot");

    return 0;
}

2. compiling:

gcc -Wall gvLayout_SIGSEG.c -lgvc -lcgraph -lcdt -I/usr/include/graphviz

3. run

$ ./a.out 
Segmentation fault

4. call trace

$ gdb -q ./a.out 
Reading symbols from /home/dedal/programming/etoile/src/graphview/test/a.out...done.
(gdb) r
Starting program: /home/dedal/programming/etoile/src/graphview/test/a.out 
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib64/libgobject-2.0.so.0.3200.4-gdb.py", line 9, in <module>
    from gobject import register
  File "/usr/share/glib-2.0/gdb/gobject.py", line 3, in <module>
    import gdb.backtrace
ImportError: No module named backtrace
Warning: couldn't activate thread debugging using libthread_db: Cannot find new threads: generic error
warning: File "/lib64/libthread_db-1.0.so" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load".
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7932cf4 in agdictsym () from /usr/lib64/libcgraph.so.6
(gdb) bt
#0  0x00007ffff7932cf4 in agdictsym () from /usr/lib64/libcgraph.so.6
#1  0x00007ffff7933526 in agget () from /usr/lib64/libcgraph.so.6
#2  0x00007ffff7b6521d in gvLayoutJobs () from /usr/lib64/libgvc.so.6
#3  0x00007ffff7b6adb2 in gvLayout () from /usr/lib64/libgvc.so.6
#4  0x0000000000400918 in main ()
(gdb)