Please add all the requested information about system information, blender version, steps to redo, etc, not just a title.

Hi brecht,

here is some more information....

System Information
Dell Studio 1749, i3, Windows 7, 1 GB ATI Mobility Radeon HD 5650

Blender Version
Broken: Blender 2.69.0 r60995

when importing the attached blender file objects into a new blender file, using file > link, linking just the objects, then make all objects local, then move up, move down, then as soon as i click 'ctrl & z' the blender crashes,

Any ideas?

undo steps set to 32{F32136}

thread #25: tid = 0x14d564, 0x0000000100aeb4d1 blender`BKE_curve_bevel_make(scene=0x0000000106501008, ob=0x00000001065e1c08, disp=0x0000000115f4bcb8, forRender=0, renderResolution=0) + 161 at curve.c:1641, stop reason = EXC_BAD_ACCESS (code=1, address=0x114)
  frame #0: 0x0000000100aeb4d1 blender`BKE_curve_bevel_make(scene=0x0000000106501008, ob=0x00000001065e1c08, disp=0x0000000115f4bcb8, forRender=0, renderResolution=0) + 161 at curve.c:1641
  frame #1: 0x0000000100b0fe08 blender`do_makeDispListCurveTypes(scene=0x0000000106501008, ob=0x00000001065e1c08, dispbase=0x000000010563da88, derivedFinal=0x00000001065e2120, forRender=0, forOrco=0, renderResolution=0) + 552 at displist.c:1396
  frame #2: 0x0000000100b0fbce blender`BKE_displist_make_curveTypes(scene=0x0000000106501008, ob=0x00000001065e1c08, forOrco=0) + 222 at displist.c:1612
  frame #3: 0x0000000100bf1224 blender`BKE_object_handle_update_ex(eval_ctx=0x000000010563f898, scene=0x0000000106501008, ob=0x00000001065e1c08, rbw=0x0000000000000000) + 1508 at object.c:2945
  frame #4: 0x0000000100c4924d blender`scene_update_object_func(pool=0x0000000113ad2128, taskdata=0x0000000113aabc98, threadid=6) + 285 at scene.c:1320
  frame #5: 0x0000000100dcf2b8 blender`task_scheduler_thread_run(thread_p=0x0000000105721098) + 104 at task.c:137
  frame #6: 0x00007fff85424899 libsystem_pthread.dylib`_pthread_body + 138
  frame #7: 0x00007fff8542472a libsystem_pthread.dylib`_pthread_start + 137
  frame #8: 0x00007fff85428fc9 libsystem_pthread.dylib`thread_start + 13

cu->bevobj->data and so bevcu is NULL. It's easy to add a NULL check but that doesn't seem like the right solution.

It should be possible to reproduce this if you follow these steps:

• New file
• File > Link, go to Objects, press A to select all, click Link
• L key to make local > Selected Objects
• G key to move, enter to confirm.
• Ctrl + Z to undo

@Brecht Van Lommel (brecht), managed to reproduce now. Checking for NULL is not the right solution at all, we need to understand why object data is got lost.

@Brecht Van Lommel (brecht), the issue is actually caused by linked curve pointing to a local object which screws up the file loading. As far as i can tell it's not really supported situation so guess proper solution would be to disallow making IDs local if they're used by other datablocks?

Right, either that or making the other datablocks local automatically, but to me it seems better to refuse and let the user then use Selected Objects & Data. So yes, I think we should disallow it.

◀ Merged tasks: T39354.