Open any 3D image, activate 3D interpolation, add a number of contours (bug is confirmed for at least 4 of them) and repeatedly trigger undo and redo operations => Crash will occur.
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This might be due to the write access on data that is being read by the interpolator. The crash appears to be more likely to be reproduced if the interpolation is more complex which seems to underline that assumption. Interestingly, if you perform the undo / redo operations once in sufficiently slow speed, it is more difficult to evoke the crash afterwards.
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This task was automatically closed because it wasn't updated at least since July 2016 (over 2 years). Please re-open this task if you think that it is still relevant. This most probably means that you will resolve it.