Arfrever Frehtes Taifersar Arahesis added the comment:

680959a3ae2e has caused that g-ir-scanner tool from gobject-introspection 
(which seems to create some pickles and next load them?) fails with 
MemoryError, e.g. during building of GTK+.
MemoryError occurs only for a subset of pickles.
I attach a small pickle, which allows to reproduce this problem.
Download this pickle and save it in /tmp.

Additional preparation:
$ cd /tmp
$ wget -q 
http://ftp.gnome.org/pub/gnome/sources/gobject-introspection/1.34/gobject-introspection-1.34.2.tar.xz
$ tar -xJf gobject-introspection-1.34.2.tar.xz
$ sed -e '/^with LibtoolImporter/,/^$/d' -i 
gobject-introspection-1.34.2/giscanner/xmlwriter.py

Behavior before 680959a3ae2e:
$ PYTHONPATH="gobject-introspection-1.34.2" python2.7 -c 'import cPickle; 
print(cPickle.load(open("pickle")))'
<giscanner.girparser.GIRParser object at 0x7f506299be90>

Behavior after 680959a3ae2e:
$ PYTHONPATH="gobject-introspection-1.34.2" python2.7 -c 'import cPickle; 
print(cPickle.load(open("pickle")))'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
MemoryError

----------
nosy: +benjamin.peterson
priority: normal -> release blocker
resolution: fixed -> 
stage: committed/rejected -> 
status: closed -> open
Added file: http://bugs.python.org/file29239/pickle

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<http://bugs.python.org/issue13555>
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