Opened 9 years ago

Closed 9 years ago

#13817 closed defect (fixed)

Memory leak in python vboxapi

Reported by: ali123 Owned by:
Component: other Version: VirtualBox 4.3.20
Keywords: vboxapi python sdk Cc:
Guest type: all Host type: Windows


This is an issue with the python library in the sdk: sdk/install/vboxapi/

If you create, then delete, a WEBSERVICE VirtualBoxManager object then it leaves 2 uncollectable objects in the garbage collector: vboxapi.VirtualBoxManager and ZSI.parse.ParsedSoap. The first is due to a circular reference, and the second due to a typo.

To replicate:

import gc
from vboxapi import VirtualBoxManager
creds = {'url': 'http://SERVER:18083', 'user': 'USERNAME', 'password': 'PASSWORD'}
manager = VirtualBoxManager('WEBSERVICE', creds)
del manager

This displays the uncollectable objects:

[<vboxapi.VirtualBoxManager object at 0x0235DED0>, <ZSI.parse.ParsedSoap instance at 0x0413D7D8>]

To workaround: Perform the following instead of "del manager":

del manager.mgr
del manager

The circular reference issue: has a circular reference at the end of the __init__ method of the VirtualBoxManager class (line 996):

    self.mgr = self;

The VirtualBoxManager class also defines a __del__ method (line 998).

A circular reference and a __del__ method mean that the object cannot be collected by the garbage collector (see

The typo:

In file, class PlatformWEBSERVICE, method deinit it calls disconnect(), where it should call self.disconnect() (line 878).

Change History (5)

comment:1 by Klaus Espenlaub, 9 years ago

Thanks for letting us know... the circular reference was trivially replaced by a property and the rest you already served on the silver platter. Will try to wrap this up ASAP and pass you a new SDK package for testing.

comment:2 by Klaus Espenlaub, 9 years ago

Hopefully fixed SDK package is at - feedback is very welcome.

comment:3 by ali123, 9 years ago

I've tested the new one and the problem is fixed. Thanks very much.

comment:4 by Klaus Espenlaub, 9 years ago

Thanks for the quick feedback... will be included in the next 4.3 release.

comment:5 by Frank Mehnert, 9 years ago

Resolution: fixed
Status: newclosed

Fix is part of VBox 4.3.22.

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