[Gmsh] Gmsh error: Segmentation violation (invalid memory reference)

[Mr Duong Hoang Vu]

Dear all,

I am trying to use Gmsh to generate a 3D unstructured mesh for a slide. 
I can mesh 3D with characteristic length lc=0.5 and characteristic 
length factor = 1 and have a mesh with about 30000 nodes and 125000 
tetrahedra. When I decrease lc to 0.2 or characteristic length factor 
to 0.5, I got error "segmentation violation", although my system memory 
still have 1GB available at that time. I need to decrease lc and 
characteristic length factor to get the radius of the sphere around a 
tetrahedron about 0.02mm, the unit of  point's coordination I am using 
is also milimet (mm). I attach here my .geo file and error file I got.
Please give me your suggestion as soon as you can.

Thanks,
Duong Vu.
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