bm.*.sort() leads to strange bytes object and crashes occasionally #45939

New Issue

CodeManX · 2015-08-28T22:49:29+02:00

CodeManX commented

2015-08-28 22:49:29 +02:00

System Information
Windows 8.1, 64bit

Blender Version
Broken: 2.75a official

Short description of error

Exact steps for others to reproduce the error
Add a Plane, go to edit mode and run below script several times. It should eventually produce an error that bytes object does not have property "index" or "co". Subsequent runs of the script or clicks in viewport may crash Blender.

import bpy
import bmesh
import random

ob = bpy.context.object
assert ob.type == "MESH"
me = ob.data

bm = bmesh.from_edit_mesh(me)
new_order = list(range(len(bm.verts)))
random.shuffle(new_order)

for i, v in zip(new_order, bm.verts):
    v.index = i

print("shuffled indices:")
for v in bm.verts:
    print(v.index)

print("update index()")    
bm.verts.index_update()

print("indices returned to original order:")
for v in bm.verts:
    print(v.index, v.co.xy)

print("shuffling again, followed by a sort:")
for i, v in zip(new_order, bm.verts):
    v.index = i
bm.verts.sort()

for v in bm.verts:
    print(v.index, v.co.xy)
    
bmesh.update_edit_mesh(me)

**System Information** Windows 8.1, 64bit **Blender Version** Broken: 2.75a official **Short description of error** **Exact steps for others to reproduce the error** Add a Plane, go to edit mode and run below script several times. It should eventually produce an error that bytes object does not have property "index" or "co". Subsequent runs of the script or clicks in viewport may crash Blender. ``` import bpy import bmesh import random ob = bpy.context.object assert ob.type == "MESH" me = ob.data bm = bmesh.from_edit_mesh(me) new_order = list(range(len(bm.verts))) random.shuffle(new_order) for i, v in zip(new_order, bm.verts): v.index = i print("shuffled indices:") for v in bm.verts: print(v.index) print("update index()") bm.verts.index_update() print("indices returned to original order:") for v in bm.verts: print(v.index, v.co.xy) print("shuffling again, followed by a sort:") for i, v in zip(new_order, bm.verts): v.index = i bm.verts.sort() for v in bm.verts: print(v.index, v.co.xy) bmesh.update_edit_mesh(me) ```

CodeManX commented

2015-08-28 22:49:29 +02:00

Changed status to: 'Open'

CodeManX commented

2015-08-28 22:49:29 +02:00

Added subscriber: @CodeManX

Sergey Sharybin commented

2015-08-29 11:26:22 +02:00

Added subscribers: @ideasman42, @Sergey

Campbell Barton was assigned by Sergey Sharybin

2015-08-29 11:26:22 +02:00

Sergey Sharybin commented

2015-08-29 11:26:22 +02:00

Can confirm the crash, it actually happens first time you run the script with asan enabled.

I'm not sure if there's some obvious mistake in the py code, will let @ideasman42 to decide :)

Can confirm the crash, it actually happens first time you run the script with asan enabled. I'm not sure if there's some obvious mistake in the py code, will let @ideasman42 to decide :)

Campbell Barton commented

2015-08-31 09:00:45 +02:00

I can't get this to crash.
Even playing back animation (in edit-mode), while holding Enter, over the run script button - is working fine.

Tested with valgrind and asan, - no errors in either.

@Sergey, whats the report you get?

I can't get this to crash. Even playing back animation (in edit-mode), while holding Enter, over the run script button - is working fine. Tested with valgrind and asan, - no errors in either. @Sergey, whats the report you get?

CodeManX commented

2015-09-01 00:36:50 +02:00

All it prints to console is "Error: EXCEPTION_ACCESS_VIOLATION".

@Sergey / @ideasman42: What OS did you try this on? And what exact Blender version?

All it prints to console is "Error: EXCEPTION_ACCESS_VIOLATION". @Sergey / @ideasman42: What OS did you try this on? And what exact Blender version?

CodeManX commented

2015-09-01 00:58:28 +02:00

Error occurs at least on Windows 8, 64bit in every version since the introduction of sort(), which was 2.64 (had to adapt the test script, because update_edit_mesh() didn't exist back then). I tried 32 and 64 bit releases.

In 2.64, the error is slightly different: 'PyCapsule' object has no attribute 'index' .

It's definitely the sort() call, if I comment it out, everything is fine.

Error occurs at least on Windows 8, 64bit in every version since the introduction of sort(), which was 2.64 (had to adapt the test script, because update_edit_mesh() didn't exist back then). I tried 32 and 64 bit releases. In 2.64, the error is slightly different: 'PyCapsule' object has no attribute 'index' . It's definitely the sort() call, if I comment it out, everything is fine.

blender-admin commented

2015-09-01 08:07:34 +02:00

This issue was referenced by blender/blender@9304df5182

This issue was referenced by blender/blender@9304df51827f9040789364d8374ce12ef5c43e41

Campbell Barton commented

2015-09-01 08:14:02 +02:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2015-09-01 08:14:02 +02:00

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bm.*.sort() leads to strange bytes object and crashes occasionally #45939