[ python-Bugs-1376775 ] Memory leak in the email package

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Bugs item #1376775, was opened at 2005-12-08 17:03
Message generated for change (Comment added) made by ken668
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: ken668 (ken668)
Assigned to: Nobody/Anonymous (nobody)
Summary: Memory leak in the email package

Initial Comment:
memory leak in email.message_from_string. This is what
I did to create a leak.

You used the attached file, memleak.eml.

f = open("memleak.eml")
buffer = f.read()
f.close()

# now buffer has the email string
msg = email.message_from_string(buffer)
msg = None # this should free the memory but it doesn't

# The memory that is used in msg is not completely free


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>Comment By: ken668 (ken668)
Date: 2005-12-12 08:00

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My mistake. I had also called gc.get_objects() too. It was
gc.get_objects() that outputed the content of the email
message. It was not gc.garbage. Sorry about that.

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Comment By: ken668 (ken668)
Date: 2005-12-12 07:59

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My mistake. I had also called gc.get_objects() too. It was
gc.get_objects() that outputed the content of the email
message. It was not gc.garbage. Sorry about that.

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Comment By: ken668 (ken668)
Date: 2005-12-12 07:53

Message:
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I added these three lines after the line "msg=None"

import gc
print "gc.collect()\n\n", gc.collect()
print "gc.garbage\n\n", gc.garbage

If you pipe the output of gc.garbage to a file, you will see
the email message you just sent are still be in the memory.

Everytime I call email.message_from_string, a copy of the
message will be kept in the memory even after I set the
returned value to None.

I tried the same thing with email package email-2.5.tar.gz,
that memory was freed right after I set the variable "msg"
to None.

Thanks

Ken



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Comment By: Neal Norwitz (nnorwitz)
Date: 2005-12-11 12:13

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What causes you to believe this is a memory leak?  I ran
this under valgrind and it doesn't report any leaks.

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