BGE: Children objects not freed after python acces. #40475

New Issue

Guillaume BRUN · 2014-06-03T00:29:23+02:00

Guillaume BRUN commented

2014-06-03 00:29:23 +02:00

Blender Version
Broken: 2.70a (could not test 2.71)

Short description of error
Blender crashes suddenly when starting game (PKEY) or at random while playing

Exact steps for others to reproduce the error
Use the attached .blend file .

Start the game, play a bit (W-S control the prop), escape to quit, then start again and play a bit more. Crash should occur within 3 minutes, sometimes instantly - some other times when STOPPING the game with esc.

Additional info
scenegraph node was null. They'll see it at once
lazy solution is to just add a NULL check
but ideally we want to know why that pointer is nulled out

**Blender Version** Broken: 2.70a (could not test 2.71) **Short description of error** Blender crashes suddenly when starting game (PKEY) or at random while playing **Exact steps for others to reproduce the error** Use the [attached .blend file ](https://developer.blender.org/file/info/PHID-FILE-by7242uc6mytzhnp73qq/). Start the game, play a bit (W-S control the prop), escape to quit, then start again and play a bit more. Crash should occur within 3 minutes, sometimes instantly - some other times when STOPPING the game with esc. **Additional info** <psy-fi> scenegraph node was null. They'll see it at once <psy-fi> lazy solution is to just add a NULL check <psy-fi> but ideally we want to know why that pointer is nulled out

Guillaume BRUN commented

2014-06-03 00:29:23 +02:00

Changed status to: 'Open'

Guillaume BRUN commented

2014-06-03 00:29:23 +02:00

Added subscriber: @Cheaterman

Mitchell Stokes was assigned by Antonis Ryakiotakis

2014-06-03 00:33:12 +02:00

Mitchell Stokes commented

2014-06-03 23:30:05 +02:00

There is something strange going on with our Python interface not properly freeing/releasing objects. For now, it appears changing airflow_deflect to this (change how own.children is used):

import GameLogic

#import mathutils


def airflow_deflect(obj, plane):
	if 'deflect_size' in plane:
		plane_normal = plane.worldOrientation.copy()
		plane_normal.invert()
		plane_normal = plane_normal[2]
		
		relpos = plane.position - obj.position
		vel = obj.getVelocity(relpos).copy()
		
		factor = (vel * plane_normal) * plane["deflect_size"]

		if 'deflect_scaling' in obj:
			factor *= obj["deflect_scaling"]
		obj.applyImpulse(relpos, plane_normal*-factor)

	#applyForce(obj, relpos, plane_normal*factor)

		

cont = GameLogic.getCurrentController()
own = cont.owner

#children = own.children

if own.name == 'Cube':
	own['speed'] = -(own.getLinearVelocity(True)[1] * 3.6)

for child in own.children:
	airflow_deflect(own, child)

works around the issue. I'll need to talk Campbell about this the next time I see him.

There is something strange going on with our Python interface not properly freeing/releasing objects. For now, it appears changing airflow_deflect to this (change how own.children is used): ``` import GameLogic ``` #import mathutils ``` def airflow_deflect(obj, plane): if 'deflect_size' in plane: plane_normal = plane.worldOrientation.copy() plane_normal.invert() plane_normal = plane_normal[2] relpos = plane.position - obj.position vel = obj.getVelocity(relpos).copy() factor = (vel * plane_normal) * plane["deflect_size"] if 'deflect_scaling' in obj: factor *= obj["deflect_scaling"] obj.applyImpulse(relpos, plane_normal*-factor) ``` #applyForce(obj, relpos, plane_normal*factor) ``` cont = GameLogic.getCurrentController() own = cont.owner ``` #children = own.children ``` if own.name == 'Cube': own['speed'] = -(own.getLinearVelocity(True)[1] * 3.6) for child in own.children: airflow_deflect(own, child) ``` works around the issue. I'll need to talk Campbell about this the next time I see him.

Inês Almeida commented

2014-06-27 22:59:59 +02:00

Added subscribers: @ideasman42, @brita

Inês Almeida commented

2014-06-27 22:59:59 +02:00

asking campbell about this then :)

Porteries Tristan commented

2015-10-11 21:09:57 +02:00

Added subscriber: @panzergame

Porteries Tristan commented

2015-10-11 21:09:57 +02:00

it's very odd, the following code create the temporary (it's free at the blender close) memory leak:

from bge import *
import sys
		
def dsthsftghjdyh():
	pass

cont = logic.getCurrentController()
own = cont.owner
children = own.children
ex = [0, 2, 5]

print(sys.getrefcount(children))
print(sys.getrefcount(ex))

but if you remove the function all works, like in :

from bge import *
import sys

cont = logic.getCurrentController()
own = cont.owner
children = own.children
ex = [0, 2, 5]

print(sys.getrefcount(children))
print(sys.getrefcount(ex))

I think that's a python reference count bug. @ideasman42: Do you have an idea ?

it's very odd, the following code create the temporary (it's free at the blender close) memory leak: ``` from bge import * import sys def dsthsftghjdyh(): pass cont = logic.getCurrentController() own = cont.owner children = own.children ex = [0, 2, 5] print(sys.getrefcount(children)) print(sys.getrefcount(ex)) ``` but if you remove the function all works, like in : ``` from bge import * import sys cont = logic.getCurrentController() own = cont.owner children = own.children ex = [0, 2, 5] print(sys.getrefcount(children)) print(sys.getrefcount(ex)) ``` I think that's a python reference count bug. @ideasman42: Do you have an idea ?

Mitchell Stokes was unassigned by Porteries Tristan

2015-10-28 22:45:44 +01:00

Porteries Tristan self-assigned this 2015-10-28 22:45:44 +01:00

Porteries Tristan changed title from ~~BGE crashes without displaying any error~~ to BGE: Children objects not freed after python acces.

2015-10-28 22:47:23 +01:00

Aaron Carlisle commented

2019-06-29 02:20:13 +02:00

Added subscriber: @Blendify

Aaron Carlisle commented

2019-06-29 02:20:13 +02:00

Changed status from 'Open' to: 'Archived'

Aaron Carlisle closed this issue

2019-06-29 02:20:13 +02:00

Aaron Carlisle commented

2019-06-29 02:20:13 +02:00

This task is being closed because the BGE has been removed in Blender 2.8.

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BGE: Children objects not freed after python acces. #40475