Bug#745487: apt python library leak memory and file descriptors
Control: tag -1 pending
On Tue, Apr 22, 2014 at 11:23:24AM +0200, Petter Reinholdtsen wrote:
>
> Package: python-apt
> Version: 0.8.8.2
> Severity: important
>
> Since I wrote the isenkram package, it have been plagued with a nasty
> resourse leak. It leak memory and file descriptors every time some
> hardware is inserted. The amount of leaked memory varies, but seem to
> be 30-40 MiB every time. The amount of file descriptors depend on the
> number of APT sources listed in /etc/apt/.
> <URL: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=730704 >
> is an example on what happen when the process run out of file
> descriptors, and
> <URL: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=719837 > is the
> initial report about leaking memory.
>
> I've been able to track down the problem to the python-apt library, and
> the following test program demonstrate the leak:
>
> #!/usr/bin/python
> import apt
> while True:
> cache = apt.Cache()
> cache.open(None)
Just fixed it in git, expect it to be part of the upcoming
1.0 release.
The problem was that apt.Cache() had a cyclic reference to
itself, because it stored its own methods in its callback
dictionary.
BTW: There is no need to open() the cache, the constructor
already opens it.
--
Julian Andres Klode - Debian Developer, Ubuntu Member
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