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[Bruno Chareyre <1732210@xxxxxxxxxxxxxxxxxx>]

>It seems to be another compiler/cgal a-logical bug

Well... blame the a-logical programmer first.
A redundant and undefined FlowEngine::currentTess was floating around. It was harmless until someone had the idea of using it in some code. 
Fixed in [1].
Bruno

[1]
https://github.com/yade/trunk/commit/890f2c251657ed851859bdf8b700c400745658a0

** Changed in: yade
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1732210

Title:
  getNeighbors_Segmentation fault (core dumped)

Status in Yade:
  Fix Released

Bug description:
  Hi,

  I got an error "Segmentation fault (core dumped)". I have narrowed
  down to find out that the problem is about the function
  getNeighbors(). But this error does not always happen. I got error
  when num_spheres = 50,100,200,250,300 but when num_spheres = 150 there
  will be no error with getNeighbors()

  My system info:
  Ubuntu 14.04 LTS
  Yade is compiled using packaged version yade-2017.01a

  Regards,
  Son

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