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Maniphest T61683

Linking the instance of a collection crashes Blender
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Description

System Information
Operating system: elementaryOS 0.4.1
Graphics card: GTX 1080

Blender Version
Broken: 2.80, aed631fa4779
Worked: 2.79b

Short description of error
I have two blendfiles, Scene_A and Scene B.
In Scene_A I added a monkey and moved it to a new collection, called "Suzanne".
Then I added a collection instance of Suzanne to the scene, called "suzanne_instance".
Then I saved the file.
Now, in a new file, I try to link in the object "suzanne_instance" -> Blender crashes.

Exact steps for others to reproduce the error
Download Scene_A:

scene_A.blend668 KBDownload

Download Scene_B:

scene_B.blend579 KBDownload

If you open Scene_B and try to link in the object "suzanne_instance" from Scene_A Blender crashes.
In theory you could also just use the default startup file instead of Scene_B.

If I try the same but instead of a monkey I try it with the default cube I do not get a crash. I assume it is because the mesh "Cube" is already present in the default scene, hence it is present in SceneB, and so Blender finds a mesh with the same name it tries to instance, is happy and does not crash.

Revisions and Commits

rB Blender
rBcba447966ec5 Fix T61683: Linking the instance of a collection crashes Blender.

Related Objects

Event Timeline

Sebastian Koenig (sebastian_k) created this task.Feb 18 2019, 6:25 PM
William Reynish (billreynish) added a subscriber: William Reynish (billreynish).Feb 18 2019, 7:19 PM

Are you even supposed to be able to instance an instance?

Sebastian Koenig (sebastian_k) added a comment.Feb 18 2019, 8:54 PM

Why wouldn't I be? It works just fine in 2.79.
Usecase:
Usually I have my main scene with main geometry for the building etc., which instances objects like furniture and props from single files.
Now I want to have a second file with a variation of that scene, but some props should be linked from the first scene to the second scene, so that those objects are always in sync and share the same position, rotation etc. . It should actually be not a big deal to do that.

Sebastian Parborg (zeddb) assigned this task to Bastien Montagne (mont29).Feb 19 2019, 11:51 AM
Sebastian Parborg (zeddb) lowered the priority of this task from 90 to 50.
Sebastian Parborg (zeddb) added a subscriber: Sebastian Parborg (zeddb).

Backtrace:

Thread 1 "blender" received signal SIGSEGV, Segmentation fault.
collection_object_add (bmain=bmain@entry=0x7fffcebe0808, collection=collection@entry=0x7fffcee741c8, ob=ob@entry=0x7fffccb64408, flag=flag@entry=0,
    add_us=add_us@entry=true) at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/collection.c:489
489			if (collection_find_child_recursive(ob->instance_collection, collection)) {
(gdb) bt
#0  collection_object_add (bmain=bmain@entry=0x7fffcebe0808, collection=collection@entry=0x7fffcee741c8, ob=ob@entry=0x7fffccb64408, flag=flag@entry=0,
    add_us=add_us@entry=true) at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/collection.c:489
#1  0x0000555556855d51 in BKE_collection_object_add (bmain=bmain@entry=0x7fffcebe0808, collection=0x7fffcee741c8, ob=ob@entry=0x7fffccb64408)
    at /home/zed/programmering/blender_master/blender/source/blender/blenkernel/intern/collection.c:550
#2  0x00005555567a9310 in link_object_postprocess (flag=1078, v3d=0x0, view_layer=0x7fffccb21d08, scene=0x7fffceacc008, bmain=0x7fffcebe0808,
    id=0x7fffccb64408) at /home/zed/programmering/blender_master/blender/source/blender/blenloader/intern/readfile.c:10516
#3  link_named_part_ex (v3d=0x0, view_layer=0x7fffccb21d08, scene=0x7fffceacc008, bmain=0x7fffcebe0808, flag=1078, name=<optimized out>,
    idcode=<optimized out>, fd=<optimized out>, mainl=mainl@entry=0x7fffcebdf308)
    at /home/zed/programmering/blender_master/blender/source/blender/blenloader/intern/readfile.c:10577
#4  BLO_library_link_named_part_ex (mainl=mainl@entry=0x7fffcebdf308, bh=bh@entry=0x7fffffffc7f0, idcode=<optimized out>, name=<optimized out>,
    flag=flag@entry=1078, bmain=bmain@entry=0x7fffcebe0808, scene=0x7fffceacc008, view_layer=0x7fffccb21d08, v3d=0x0)
    at /home/zed/programmering/blender_master/blender/source/blender/blenloader/intern/readfile.c:10621
#5  0x000055555613728d in wm_link_do (lapp_data=lapp_data@entry=0x7fffd8620010, reports=0x7fffe9662d98, bmain=bmain@entry=0x7fffcebe0808,
    scene=scene@entry=0x7fffceacc008, view_layer=view_layer@entry=0x7fffccb21d08, v3d=0x0)
    at /home/zed/programmering/blender_master/blender/source/blender/windowmanager/intern/wm_files_link.c:256
#6  0x0000555556138574 in wm_link_append_exec (C=0x7fffea058108, op=<optimized out>)
    at /home/zed/programmering/blender_master/blender/source/blender/windowmanager/intern/wm_files_link.c:445
#7  0x000055555610fb90 in wm_handler_fileselect_do (C=C@entry=0x7fffea058108, handlers=handlers@entry=0x7fffccbf7120, handler=handler@entry=0x7fffccbce088,
    val=2) at /home/zed/programmering/blender_master/blender/source/blender/windowmanager/intern/wm_event_system.c:2219
#8  0x0000555556112514 in wm_handler_fileselect_call (event=0x7fffce9a3808, handler=0x7fffccbce088, handlers=0x7fffccbf7120, C=0x7fffea058108)
    at /home/zed/programmering/blender_master/blender/source/blender/windowmanager/intern/wm_event_system.c:2307
#9  wm_handlers_do_intern (C=C@entry=0x7fffea058108, event=event@entry=0x7fffce9a3808, handlers=handlers@entry=0x7fffccbf7120)
    at /home/zed/programmering/blender_master/blender/source/blender/windowmanager/intern/wm_event_system.c:2438
#10 0x0000555556112c4c in wm_handlers_do (C=C@entry=0x7fffea058108, event=event@entry=0x7fffce9a3808, handlers=handlers@entry=0x7fffccbf7120)
    at /home/zed/programmering/blender_master/blender/source/blender/windowmanager/intern/wm_event_system.c:2655
#11 0x000055555611342d in wm_event_do_handlers (C=C@entry=0x7fffea058108)
    at /home/zed/programmering/blender_master/blender/source/blender/windowmanager/intern/wm_event_system.c:3046
#12 0x000055555610a8f0 in WM_main (C=0x7fffea058108) at /home/zed/programmering/blender_master/blender/source/blender/windowmanager/intern/wm.c:418
#13 0x00005555560f5453 in main (argc=1, argv=0x7fffffffdd28) at /home/zed/programmering/blender_master/blender/source/creator/creator.c:505
Bastien Montagne (mont29) changed the task status from Unknown Status to Resolved by committing rBcba447966ec5: Fix T61683: Linking the instance of a collection crashes Blender..Feb 19 2019, 1:50 PM
Bastien Montagne (mont29) added a commit: rBcba447966ec5: Fix T61683: Linking the instance of a collection crashes Blender..
Sebastian Koenig (sebastian_k) mentioned this in T61796: Linking a collection with instances inside will place the instanced object in the scene.Feb 21 2019, 12:27 PM