#4752: list_plot3d crashes sage with some exact input
----------------------+-----------------------------------------------------
 Reporter:  mhampton  |       Owner:  was                  
     Type:  defect    |      Status:  new                  
 Priority:  major     |   Milestone:  sage-3.2.2           
Component:  graphics  |    Keywords:  list_plot3d, graphics
----------------------+-----------------------------------------------------
 The following is an example of the problem (which was first noticed by
 "Snark" on the IRC sage-devel channel):
 {{{
 sage: pts =[(-4/5, -2/5, -2/5), (-4/5, -2/5, 2/5), (-4/5, 2/5, -2/5),
 (-4/5, 2/5, 2/5), (-2/5, -4/5, -2/5), (-2/5, -4/5, 2/5), (-2/5, -2/5,
 -4/5), (-2/5, -2/5, 4/5), (-2/5, 2/5, -4/5), (-2/5, 2/5, 4/5), (-2/5, 4/5,
 -2/5), (-2/5, 4/5, 2/5), (2/5, -4/5, -2/5), (2/5, -4/5, 2/5), (2/5, -2/5,
 -4/5), (2/5, -2/5, 4/5), (2/5, 2/5, -4/5), (2/5, 2/5, 4/5), (2/5, 4/5,
 -2/5), (2/5, 4/5, 2/5), (4/5, -2/5, -2/5), (4/5, -2/5, 2/5), (4/5, 2/5,
 -2/5), (4/5, 2/5, 2/5)]
 sage: show(list_plot3d(pts))

 ------------------------------------------------------------
 Unhandled SIGBUS: A bus error occured in SAGE.
 This probably occured because a *compiled* component
 of SAGE has a bug in it (typically accessing invalid memory)
 or is not properly wrapped with _sig_on, _sig_off.
 You might want to run SAGE under gdb with 'sage -gdb' to debug this.
 SAGE will now terminate (sorry).
 ------------------------------------------------------------

 python(2829) malloc: *** error for object 0xed2f1f0: incorrect checksum
 for freed object - object was probably modified after being freed, break
 at szone_error to debug
 python(2829) malloc: *** set a breakpoint in szone_error to debug
 }}}

 It doesn't crash if the pts are converted to numerical values, although
 the interpolated surface looks bad no matter which interpolation setting
 is used.  The example points are on a sphere.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4752>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of 
Reinventing the Wheel
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