Segmentation fault when running Convex Hull about liquidfun

[stewartmiles]

I just gave this a try on our Linux build in the debug and release configs but it doesn't result in a crash. Do you have any details on where the segmentation fault occurs?

Could you run gdb on the core dump to see where the application crashed?

[raivivek]

The following is a gdb output for the program.

Starting program: /home/vivekrai/liquidfun/Box2D/Testbed/Debug/Testbed 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
0x08091f3d in DebugDraw::DrawPolygon (this=0x823eb64, vertices=0xbffff0dc, 
    vertexCount=1058371353, color=...)
    at /home/vivekrai/liquidfun/Box2D/Testbed/Framework/Render.cpp:55
55          glVertex2f(vertices[i].x, vertices[i].y);

[jsanmiya]

Sorry for the delay on this. Can you please tell me if the 'vertices' array is bad? or perhaps the 'i' variable?

[raivivek]

I just checked the variables during runtime and the following is obtained:

(gdb) print i
$1 = 604
(gdb) print vertices[i].x
$2 = 0
(gdb) print vertices[i].y
Cannot access memory at address 0xc0000000
(gdb) print vertices[i]
Cannot access memory at address 0xc0000000

[jsanmiya]

Looking at your first message, vertexCount=1058371353 doesn't seem valid. Perhaps you can debug up the call stack to see where that number comes from?