Blender Foundation: Blender 2.x BF release: Detail: 32692 Crash on Python console autocompletion

Log In
New Account

[#32692] Crash on Python console autocompletion

Date:
2012-09-29 11:06 Priority:
3

State:
Closed

Submitted by:
Artyom Lebedev (vagran) Assigned to:
Campbell Barton (campbellbarton)

Category:
Python Status:
Won't-Fix / Closed

Relates to: Duplicates:

Patches:

Summary:
Crash on Python console autocompletion

Detailed description

Crash sometimes occurs when using Python console autocompletion. I did not managed to find exact reproduction scenarios, crashes occur spontaneously. Hope fault location will help:
blender[3648] general protection ip:1070205 sp:7fffdae10930 error:0 in blender[400000+3a26000]
System info file and loaded model file attached.

Followup

Message

Date: 2012-09-29 14:24
Sender: Campbell Barton
This is not enough info to redo the crash.

You need to give steps to redo the crash, even if it happens only one in 10 times, the steps you go through to get the crash to happen are really important.

marking as incomplete.

Date: 2012-10-01 12:52
Sender: Sebastian Nell
i can confirm (random?) crashes on auto-complete, but not provide any steps to reproduce it either.

IIRC, it happened for me when auto-completing variable attributes, and the variable was a ref to blender data, like:

var = bpy.context.object
# do stuff here
var.<strg+spacebar> CRASH

the problem might have to do with a context, that changes over time, and accessing attributes might try to read from invalid memory address - but it's just a wild guess

Date: 2012-10-02 04:42
Sender: Campbell Barton
This is likely invalid memory access: see
http://www.blender.org/documentation/blender_python_api_2_63_release/info_gotcha.html#edit-mode-memory-access

there is a cmake build time option that checks for this but slows down blender/python execution too. - WITH_PYTHON_SAFETY

closing. can re-open if you find steps to redo which are not accessing freed data (which is known limitation)

Date: 2012-10-02 14:04
Sender: Sebastian Nell
pretty sure it's invalid memory access:

Edit mode:
>>> p=bpy.context.object.data.polygons[0]
>>> p
bpy.data.meshes['Cube'].polygons[0]

Object mode
>>> p
bpy.data.meshes['Cube'].polygons[-292049]

auto-completing p does crash blender, as the reference is bad. So we just need to be careful with vars which refer to geometry and have been assigned in edit mode.

Attached Files:

Name	Date	Download

armat.blend	2012-09-29 11:06	Download
system-info.txt	2012-09-29 11:06	Download

Changes:

Field	Old Value	Date	By

Status	Incomplete	2012-10-02 04:42	campbellbarton
status_id	Open	2012-10-02 04:42	campbellbarton
close_date	None	2012-10-02 04:42	campbellbarton
assigned_to	none	2012-09-29 14:24	campbellbarton
Status	New	2012-09-29 14:24	campbellbarton
File Added	22203: armat.blend	2012-09-29 11:06	vagran
File Added	22204: system-info.txt	2012-09-29 11:06	vagran