Crash when using pickle and ElementTree

[Kronuz]

BPO	18997
Nosy	@scoder, @Kronuz
Files	houses.xml: XML test file join_obj.diff: Fixes getstate/setstate

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2013-09-13.13:28:41.617>
created_at = <Date 2013-09-10.13:49:20.540>
labels = ['extension-modules', 'type-bug']
title = 'Crash when using pickle and ElementTree'
updated_at = <Date 2013-09-18.10:13:36.652>
user = 'https://github.com/Kronuz'

bugs.python.org fields:

activity = <Date 2013-09-18.10:13:36.652>
actor = 'python-dev'
assignee = 'eli.bendersky'
closed = True
closed_date = <Date 2013-09-13.13:28:41.617>
closer = 'eli.bendersky'
components = ['Extension Modules']
creation = <Date 2013-09-10.13:49:20.540>
creator = 'Kronuz'
dependencies = []
files = ['31719', '31725']
hgrepos = []
issue_num = 18997
keywords = ['patch']
message_count = 6.0
messages = ['197440', '197452', '197455', '197568', '197570', '198012']
nosy_count = 5.0
nosy_names = ['scoder', 'Arfrever', 'eli.bendersky', 'python-dev', 'Kronuz']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue18997'
versions = ['Python 3.3', 'Python 3.4']

[Kronuz]

On the tip of 3.3, I've found Element.__getstate__ doesn't work and neither as pickle.dumps(Element) under certain circumstances.

This crashes:
e1 = ElementTree().parse('houses.xml')
e1.__getstate__()

This doesn't crash:
e2 = ElementTree().parse('houses.xml')
e2.text = 'some'
e2.__getstate__()

But still, both of these crash:
pickle.dumps(e1)
pickle.dumps(e2)

[Kronuz]

The attached patch fixes the problem (there were some missing JOIN_OBJ())

[elibendersky]

Thanks for this report, Germán (and the other issue as well). I'll do my best to take a look later this week.

[python-dev]

New changeset 39823ebfc731 by Eli Bendersky in branch '3.3':
Issue bpo-18997: fix ElementTree crash with using pickle and __getstate__.
http://hg.python.org/cpython/rev/39823ebfc731

New changeset bda5a87df1c8 by Eli Bendersky in branch 'default':
Merge for Issue bpo-18997: Issue bpo-18997: fix ElementTree crash with using pickle and __getstate__.
http://hg.python.org/cpython/rev/bda5a87df1c8

[elibendersky]

Fixed the patch and committed. Thanks.

[python-dev]

New changeset 111a74819192 by doko in branch '3.3':

• followup for issue bpo-18997, make _clear_joined_ptr static.
  http://hg.python.org/cpython/rev/111a74819192

New changeset 269be4aacb8e by doko in branch 'default':

• followup for issue bpo-18997, make _clear_joined_ptr static.
  http://hg.python.org/cpython/rev/269be4aacb8e