Cycles Bake break when building a special mesh #45729

New Issue

Dalai Felinto · 2015-08-07T21:49:01+02:00

Dalai Felinto commented

2015-08-07 21:49:01 +02:00

Blender Version
Broken: 2.75
Worked: 2.74

Short description of error
I'm importing the mesh from SketchUp (using BlendUp plugin), so maybe the problem is in the mesh. But as soon as I bake I get a segfault.

Exact steps for others to reproduce the error

bake-bug.blend

Open the attached file with:

./blender -y -b bake-bug.blend
(the file is a simple mesh, and a simple script to call bake when you open the file, to simplify debugging)

ASAN gets the following crash:

==3206== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60180008243b at pc 0x34fe9c5 bp 0x7fffffffc160 sp 0x7fffffffc158
WRITE of size 1 at 0x60180008243b thread T0
    - 0 0x34fe9c4 in CustomData_copy_data_layer /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/customdata.c:2173
    - 1 0x34fee3a in CustomData_copy_data /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/customdata.c:2216
    - 2 0x36c4cda in BKE_mesh_split_faces /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/mesh.c:2294
    - 3 0x246cea9 in bake /home/dfelinto/blender/git/blender/source/blender/editors/object/object_bake_api.c:691
    #4 0x2470c68 in bake_exec /home/dfelinto/blender/git/blender/source/blender/editors/object/object_bake_api.c:1118  

0x60180008243b is located 3 bytes to the right of 120-byte region [0x6018000823c0,0x601800082438)
allocated by thread T0 here:
    - 0 0x7ffff4e6041a in malloc ??:?
    - 1 0x4493a07 in MEM_lockfree_mallocN /home/dfelinto/blender/git/blender/intern/guardedalloc/intern/mallocn_lockfree_impl.c:307
    - 2 0x34fc52c in customData_add_layer__internal /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/customdata.c:1832
    - 3 0x34f975e in CustomData_merge /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/customdata.c:1488
    - 4 0x34f9a8b in CustomData_copy /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/customdata.c:1515
    - 5 0x33c4045 in DM_to_mesh /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/DerivedMesh.c:715
    - 6 0x36c5b6f in BKE_mesh_new_from_object /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/mesh.c:2452
    - 7 0x246ce93 in bake /home/dfelinto/blender/git/blender/source/blender/editors/object/object_bake_api.c:690
    #8 0x2470c68 in bake_exec /home/dfelinto/blender/git/blender/source/blender/editors/object/object_bake_api.c:1118 (discriminator 2)

Which leads to the lines:

690 . me_low = BKE_mesh_new_from_object(bmain, scene, ob_low, 1, 2, 0, 0);
691 . BKE_mesh_split_faces(me_low);

I will wait for the other cycles bug to be fixed without investigating this one further.

**Blender Version** Broken: 2.75 Worked: 2.74 **Short description of error** I'm importing the mesh from SketchUp (using BlendUp plugin), so maybe the problem is in the mesh. But as soon as I bake I get a segfault. **Exact steps for others to reproduce the error** [bake-bug.blend](https://archive.blender.org/developer/F221462/bake-bug.blend) Open the attached file with: `./blender -y -b bake-bug.blend` (the file is a simple mesh, and a simple script to call bake when you open the file, to simplify debugging) ASAN gets the following crash: ``` ==3206== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60180008243b at pc 0x34fe9c5 bp 0x7fffffffc160 sp 0x7fffffffc158 WRITE of size 1 at 0x60180008243b thread T0 - 0 0x34fe9c4 in CustomData_copy_data_layer /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/customdata.c:2173 - 1 0x34fee3a in CustomData_copy_data /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/customdata.c:2216 - 2 0x36c4cda in BKE_mesh_split_faces /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/mesh.c:2294 - 3 0x246cea9 in bake /home/dfelinto/blender/git/blender/source/blender/editors/object/object_bake_api.c:691 #4 0x2470c68 in bake_exec /home/dfelinto/blender/git/blender/source/blender/editors/object/object_bake_api.c:1118 0x60180008243b is located 3 bytes to the right of 120-byte region [0x6018000823c0,0x601800082438) allocated by thread T0 here: - 0 0x7ffff4e6041a in malloc ??:? - 1 0x4493a07 in MEM_lockfree_mallocN /home/dfelinto/blender/git/blender/intern/guardedalloc/intern/mallocn_lockfree_impl.c:307 - 2 0x34fc52c in customData_add_layer__internal /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/customdata.c:1832 - 3 0x34f975e in CustomData_merge /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/customdata.c:1488 - 4 0x34f9a8b in CustomData_copy /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/customdata.c:1515 - 5 0x33c4045 in DM_to_mesh /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/DerivedMesh.c:715 - 6 0x36c5b6f in BKE_mesh_new_from_object /home/dfelinto/blender/git/blender/source/blender/blenkernel/intern/mesh.c:2452 - 7 0x246ce93 in bake /home/dfelinto/blender/git/blender/source/blender/editors/object/object_bake_api.c:690 #8 0x2470c68 in bake_exec /home/dfelinto/blender/git/blender/source/blender/editors/object/object_bake_api.c:1118 (discriminator 2) ``` Which leads to the lines: 690 . me_low = BKE_mesh_new_from_object(bmain, scene, ob_low, 1, 2, 0, 0); 691 . BKE_mesh_split_faces(me_low); I will wait for the other cycles bug to be fixed without investigating this one further.

Dalai Felinto commented

2015-08-07 21:49:01 +02:00

Changed status to: 'Open'

Dalai Felinto commented

2015-08-07 21:49:01 +02:00

Added subscriber: @dfelinto

Dalai Felinto commented

2015-08-07 22:33:18 +02:00

Added subscriber: @ideasman42

Dalai Felinto commented

2015-08-07 22:33:18 +02:00

I just confirmed and the bug was introduced on 1cd4070e (Fix: Cycles bake disregards Auto Smooth (vertex per-face normals))

@ideasman42 any clues whether the issue is the file (corrupted mesh?) or your commit? Thanks :)

I just confirmed and the bug was introduced on 1cd4070e (Fix: Cycles bake disregards Auto Smooth (vertex per-face normals)) @ideasman42 any clues whether the issue is the file (corrupted mesh?) or your commit? Thanks :)

Sergey Sharybin was assigned by Dalai Felinto

2015-08-10 22:16:59 +02:00

Dalai Felinto commented

2015-08-10 22:16:59 +02:00

Added subscriber: @Sergey