[Python-bugs-list] [ python-Bugs-466175 ] cPickle core dump

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Bugs item #466175, was opened at 2001-09-28 12:52
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=466175&group_id=5470

Category: Extension Modules
Group: None
Status: Open
Resolution: None
Priority: 6
Submitted By: Jeremy Hylton (jhylton)
Assigned to: Jeremy Hylton (jhylton)
Summary: cPickle core dump

Initial Comment:
A cPickler Pickler() operating in fast mode, i.e. when
Pickler().fast =1, dumps core on recursive objects.

a = []
a.append(a)
p = cPickle.Pickler()
p.fast = 1
p.dump(a)
[segfault]
The fast flag indicates that pickle shouldn't keep
track of object it has seen before, so it gets caught
in an infinite loop if it hits a recursive object.

Jim worries that fixing the segfault will slow down the
fast mode, which is a big performance improvement.  I
think it can be solved using the same trick that we use
for comparing and printing recursive objects like [[...]].

The approach is to use a simple counter to track
recursive calls.  Only track objects previously seen
after the counter exceeds some threshhold.


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>Comment By: Guido van Rossum (gvanrossum)
Date: 2001-09-28 13:04

Message:
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Go for it. I take it this relates to a customer project?
Else why the priority 6?

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