[ python-Bugs-1092502 ] Memory leak in socket.py on Mac OS X 10.3

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Bugs item #1092502, was opened at 2004-12-28 21:09
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Category: Python Library
Group: Platform-specific
Status: Open
Resolution: None
Priority: 5
Submitted By: bacchusrx (bacchusrx)
Assigned to: Nobody/Anonymous (nobody)
Summary: Memory leak in socket.py on Mac OS X 10.3

Initial Comment:
Some part of socket.py leaks memory on Mac OS X 10.3 (both with 
the python 2.3 that ships with the OS and with python 2.4).

I encountered the problem in John Goerzen's offlineimap. 
Transfers of messages over a certain size would cause the program 
to bail with malloc errors, eg

*** malloc: vm_allocate(size=5459968) failed (error code=3)
*** malloc[13730]: error: Can't allocate region

Inspecting the process as it runs shows that python's total memory
size grows wildly during such transfers.

The bug manifests in _fileobject.read() in socket.py. You can 
replicate the problem easily using the attached example with "nc -l 
-p 9330 < /dev/zero" running on some some remote host.

The way _fileobject.read() is written, socket.recv is called with the 
larger of the minimum rbuf size or whatever's left to be read. 
Whatever is received is then appended to a buffer which is joined 
and returned at the end of function.

It looks like each time through the loop, space for recv_size is 
allocated but not freed, so if the loop runs for enough iterations, 
python exhausts the memory available to it.

You can sidestep the condition if recv_size is small (like 
_fileobject.default_bufsize small).

I can't replicate this problem with python 2.3 on FreeBSD 4.9 or  
FreeBSD 5.2, nor on Mac OS X 10.3 if the logic from 
_fileobject.read() is re-written in Perl (for example).

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