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Segfault when copying object data of linked object
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Description

I'm doing a MagLev mod for Space Engineers, and all the rail pieces are just linked to the same 1x1 rail piece with array and curve modifiers.
I'd accidentally kept a curve piece linked to the original, so I tried to make a single copy. Doing so reproducibly crashes Blender.

This happens on Windows 7, 64-bit, 2.77, 2.78 and November 1 Nightly. I used an addon for Space Engineers modding, but the issue happens when it's disabled as well.

Steps to reproduce:

  • Open attached (minimal) Blender file .
  • On the tool panel on the right, click [2] to make a single-user copy. Blender crashes with Error: EXCEPTION_ACCESS_VIOLATION.

Interestingly, the crash does not happen if you delete the collision geometry on layer 2 first.

Event Timeline

Hit another crash. I suspect it's the same one. This one happens because I have the materials linked to object instead of data? Same steps to reproduce, click [2] on the right and it crashes.

File:

Bastien Montagne (mont29) lowered the priority of this task from 90 to 50.

Yep, both cases have same cause, fix incoming.