In order to reproduce it, draw a rectangle with radial gradient fill, with
direction
and normal, both of length 1.

This one works (no vm crash):
|form canvas fill direction normal|
direction := 1 at 0.
normal := 0 at 0.
form := Form extent:300 at 300 depth:32.
canvas := form getCanvas.
fill := GradientFillStyle new colorRamp:{0 -> Color white . 0.5 -> Color
green . 1 -> Color blue};origin:150 at 150
;direction:direction;normal:normal;radial:true;yourself.
canvas fillRectangle: (50 at 50 extent:200 at 200) fillStyle: fill.
Display getCanvas drawImage: form at: 300 at 300.


direction := 1 at 0.
normal := 0 at 0.
-> OK

direction := 0 at 0.
normal := 0 at 1.
-> OK

direction := 1 at 0.
normal := 0 at 1.
-> VM-Crash (Pharo and Squeak)

Pharo:
VM Version: Cog VM 4.0.0 (release) from Feb 16 2015
Compiler: gcc 4.6.2
Interpreter Build: NBCoInterpreter
NativeBoost-CogPlugin-EstebanLorenzano.21 uuid:
4d9b9bdf-2dfa-4c0b-99eb-5b110dadc697 Feb 16 2015
Cogit Build: NBCogit NativeBoost-CogPlugin-EstebanLorenzano.21 uuid:
4d9b9bdf-2dfa-4c0b-99eb-5b110dadc697 Feb 16 2015
Source Version: https://github.com/pharo-project/pharo-vm.git Commit:
55fbd0b0279998a4a33852f5afb3d213986cc3ae Date: 2015-02-16 17:54:00 +0100
By: Esteban Lorenzano <estebanlm at gmail.com> Jenkins build #14895

Current byte code: -1
Primitive index: 117
Smalltalk stack dump:
  0x24c830 M BalloonEngine>copyLoopFaster 0x6b09b80: a(n) BalloonEngine
  0x24c848 M BalloonEngine>copyBits 0x6b09b80: a(n) BalloonEngine
  0x24c860 M BalloonEngine>postFlushIfNeeded 0x6b09b80: a(n) BalloonEngine
  0x24c884 I
BalloonEngine>drawRectangle:fill:borderWidth:borderColor:transform:
0x6b09b80: a(n) BalloonEngine
  0x24c8b8 I BalloonCanvas>drawRectangle:color:borderWidth:borderColor:
0x6b099c0: a(n) BalloonCanvas
  0x24c8e8 I BalloonCanvas>fillRectangle:basicFillStyle: 0x6b099c0: a(n)
BalloonCanvas


Squeak:
VM Version: Cog VM 4.0.0 (release) from Aug 22 2013
Compiler: gcc 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
Interpreter Build: CoInterpreter VMMaker.oscog-eem.331 uuid:
37d2e4b0-2f37-4e2d-8313-c63637785e59 Aug 22 2013
Cogit Build: StackToRegisterMappingCogit VMMaker.oscog-eem.333 uuid:
84da9cb8-7f30-4cb7-b4fb-239a11f63b54 Aug 22 2013
Source Version: VM: r2776 http://www.squeakvm.org/svn/squeak/branches/Cog
Plugins: r2545 http://squeakvm.org/svn/squeak/trunk/platforms/Cross/plugins

Current byte code: -1
Primitive index: 117


nicolai
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