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Maniphest T65809

Blender crash while using the Normal's "merge" option in edit mode (in the normal editing section)
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Description

System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 398.36

Blender Version
Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-14 00:12, hash: rB8ac0fef4dfd1
Worked: (optional)

Short description of error
As the title, when you try to smooth some faces using the (Normal's)merge option (with kind of high-resolution mesh) blender crash, some times you have to repeat the action (5-7 times) for the crash to occur.

Exact steps for others to reproduce the error
open blender -> subdivide the default cube until it has 1500-+ verts -> select some faces -> execute : Mesh -> Normals -> Merge. if it isn't crash, try redoing the merge action around five - seven times.

Revisions and Commits

rB Blender
rB5767dcbe60c0 Fix T65809: Blender crash while using the Normal's "merge" option in edit mode.

Related Objects

Event Timeline

Arye Ramaty (BelgaratTheGrey) created this task.Jun 14 2019, 5:42 PM
Arye Ramaty (BelgaratTheGrey) added a comment.Jun 14 2019, 5:46 PM

I will not have access to the internet during Saturday so I wouldn't be able to give any clarification regarding this bug.

Dalai Felinto (dfelinto) assigned this task to Bastien Montagne (mont29).Jun 14 2019, 6:23 PM
Dalai Felinto (dfelinto) lowered the priority of this task from 90 to High.
Dalai Felinto (dfelinto) added a subscriber: Dalai Felinto (dfelinto).

It is easy to reproduce.
Open file and run "Merge Normals":

merge-normals.blend146 KBDownload

//source/blender/editors/mesh/editmesh_tools.c:8153:9: runtime error: member access within null pointer of type 'struct BMLoopNorEditData'

Thread 1 "blender" received signal SIGSEGV, Segmentation fault.
0x000055555de742c6 in normals_merge (bm=0x6190004b0f88, lnors_ed_arr=0x603000139ea8) at //source/blender/editors/mesh/editmesh_tools.c:8153
8153            BLI_assert(lnor_ed_tmp->loop_index == loop_index && lnor_ed_tmp->loop == l);

Full backtrace: P1003

Dalai Felinto (dfelinto) added a comment.Jun 14 2019, 6:24 PM

@Bastien Montagne (mont29) basically lnor_ed_tmp is NULL there.

Bastien Montagne (mont29) changed the task status from Unknown Status to Resolved by committing rB5767dcbe60c0: Fix T65809: Blender crash while using the Normal's "merge" option in edit mode..Jun 16 2019, 6:10 PM
Bastien Montagne (mont29) added a commit: rB5767dcbe60c0: Fix T65809: Blender crash while using the Normal's "merge" option in edit mode..
Alexey Mak (S-ed) added a subscriber: Alexey Mak (S-ed).EditedSep 2 2019, 10:54 PM

@Bastien Montagne (mont29)

I've tested it on v2.81.4 (283d96de1170) and it's still crashing on merge.
But weirdly it happens only when I make the mesh prior to that. It does not happen when I open the file with the "same" mesh. You may try it on linked file but it won't crash.

NormalMerge.blend91 KBDownload