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Posted to dev@qpid.apache.org by "Jeff Ortel (JIRA)" <ji...@apache.org> on 2011/04/19 21:04:05 UTC
[jira] [Created] (QPID-3218) AttributeError: 'NoneType' object has
no attribute 'write_cmds'
AttributeError: 'NoneType' object has no attribute 'write_cmds'
---------------------------------------------------------------
Key: QPID-3218
URL: https://issues.apache.org/jira/browse/QPID-3218
Project: Qpid
Issue Type: Bug
Components: Python Client
Affects Versions: 0.7
Environment: OS=RHEL6
python-qpid-0.7.946106-12.el6.noarch
qpid-cpp-client-0.7.946106-5.el6.x86_64
qpid-cpp-server-0.7.946106-5.el6.x86_64
qpid broker on main server and all the nodes are
vm's with bridged configuration in a single network.
Reporter: Jeff Ortel
2011-04-19 22:05:07,321 [ERROR][asynctaskreplyqueue] __fetch() @ consumer.py:90 - asynctaskreplyqueue
Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/gofer/messaging/consumer.py", line 86, in __fetch
return self.receiver.fetch(timeout=self.WAIT)
File "<string>", line 6, in fetch
File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 994, in fetch
self._ecwait(lambda: self.linked)
File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 50, in _ecwait
result = self._ewait(lambda: self.closed or predicate(), timeout)
File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 957, in _ewait
result = self.session._ewait(lambda: self.error or predicate(), timeout)
File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 550, in _ewait
result = self.connection._ewait(lambda: self.error or predicate(), timeout)
File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 194, in _ewait
self.check_error()
File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 187, in check_error
raise self.error
InternalError: Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 496, in dispatch
self.engine.dispatch()
File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 791, in dispatch
self.attach(ssn)
File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 834, in attach
self.link(rcv, self._in, rcv.source)
File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 885, in link
dir.do_unlink(sst, lnk, _lnk)
File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 261, in do_unlink
sst.write_cmds(cmds, action)
AttributeError: 'NoneType' object has no attribute 'write_cmds'
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[jira] [Assigned] (QPID-3218) AttributeError: 'NoneType' object has
no attribute 'write_cmds'
Posted by "Gordon Sim (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/QPID-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gordon Sim reassigned QPID-3218:
--------------------------------
Assignee: Gordon Sim (was: Rafael H. Schloming)
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
> ---------------------------------------------------------------
>
> Key: QPID-3218
> URL: https://issues.apache.org/jira/browse/QPID-3218
> Project: Qpid
> Issue Type: Bug
> Components: Python Client
> Affects Versions: 0.7
> Environment: OS=RHEL6
> python-qpid-0.7.946106-12.el6.noarch
> qpid-cpp-client-0.7.946106-5.el6.x86_64
> qpid-cpp-server-0.7.946106-5.el6.x86_64
> qpid broker on main server and all the nodes are
> vm's with bridged configuration in a single network.
> Reporter: Jeff Ortel
> Assignee: Gordon Sim
> Attachments: test.py
>
>
> 2011-04-19 22:05:07,321 [ERROR][asynctaskreplyqueue] __fetch() @ consumer.py:90 - asynctaskreplyqueue
> Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/gofer/messaging/consumer.py", line 86, in __fetch
> return self.receiver.fetch(timeout=self.WAIT)
> File "<string>", line 6, in fetch
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 994, in fetch
> self._ecwait(lambda: self.linked)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 50, in _ecwait
> result = self._ewait(lambda: self.closed or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 957, in _ewait
> result = self.session._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 550, in _ewait
> result = self.connection._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 194, in _ewait
> self.check_error()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 187, in check_error
> raise self.error
> InternalError: Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 496, in dispatch
> self.engine.dispatch()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 791, in dispatch
> self.attach(ssn)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 834, in attach
> self.link(rcv, self._in, rcv.source)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 885, in link
> dir.do_unlink(sst, lnk, _lnk)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 261, in do_unlink
> sst.write_cmds(cmds, action)
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
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[jira] [Commented] (QPID-3218) AttributeError: 'NoneType' object
has no attribute 'write_cmds'
Posted by "Gordon Sim (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/QPID-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026371#comment-13026371 ]
Gordon Sim commented on QPID-3218:
----------------------------------
The attachment for a receivers session is not set... somewhat similar (to the uninformed at any rate) to QPID-3212
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
> ---------------------------------------------------------------
>
> Key: QPID-3218
> URL: https://issues.apache.org/jira/browse/QPID-3218
> Project: Qpid
> Issue Type: Bug
> Components: Python Client
> Affects Versions: 0.7
> Environment: OS=RHEL6
> python-qpid-0.7.946106-12.el6.noarch
> qpid-cpp-client-0.7.946106-5.el6.x86_64
> qpid-cpp-server-0.7.946106-5.el6.x86_64
> qpid broker on main server and all the nodes are
> vm's with bridged configuration in a single network.
> Reporter: Jeff Ortel
>
> 2011-04-19 22:05:07,321 [ERROR][asynctaskreplyqueue] __fetch() @ consumer.py:90 - asynctaskreplyqueue
> Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/gofer/messaging/consumer.py", line 86, in __fetch
> return self.receiver.fetch(timeout=self.WAIT)
> File "<string>", line 6, in fetch
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 994, in fetch
> self._ecwait(lambda: self.linked)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 50, in _ecwait
> result = self._ewait(lambda: self.closed or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 957, in _ewait
> result = self.session._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 550, in _ewait
> result = self.connection._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 194, in _ewait
> self.check_error()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 187, in check_error
> raise self.error
> InternalError: Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 496, in dispatch
> self.engine.dispatch()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 791, in dispatch
> self.attach(ssn)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 834, in attach
> self.link(rcv, self._in, rcv.source)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 885, in link
> dir.do_unlink(sst, lnk, _lnk)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 261, in do_unlink
> sst.write_cmds(cmds, action)
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
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[jira] [Assigned] (QPID-3218) AttributeError: 'NoneType' object has
no attribute 'write_cmds'
Posted by "Gordon Sim (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/QPID-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gordon Sim reassigned QPID-3218:
--------------------------------
Assignee: Rafael H. Schloming
Rafi, can you review the suggested fix here?
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
> ---------------------------------------------------------------
>
> Key: QPID-3218
> URL: https://issues.apache.org/jira/browse/QPID-3218
> Project: Qpid
> Issue Type: Bug
> Components: Python Client
> Affects Versions: 0.7
> Environment: OS=RHEL6
> python-qpid-0.7.946106-12.el6.noarch
> qpid-cpp-client-0.7.946106-5.el6.x86_64
> qpid-cpp-server-0.7.946106-5.el6.x86_64
> qpid broker on main server and all the nodes are
> vm's with bridged configuration in a single network.
> Reporter: Jeff Ortel
> Assignee: Rafael H. Schloming
> Attachments: test.py
>
>
> 2011-04-19 22:05:07,321 [ERROR][asynctaskreplyqueue] __fetch() @ consumer.py:90 - asynctaskreplyqueue
> Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/gofer/messaging/consumer.py", line 86, in __fetch
> return self.receiver.fetch(timeout=self.WAIT)
> File "<string>", line 6, in fetch
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 994, in fetch
> self._ecwait(lambda: self.linked)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 50, in _ecwait
> result = self._ewait(lambda: self.closed or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 957, in _ewait
> result = self.session._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 550, in _ewait
> result = self.connection._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 194, in _ewait
> self.check_error()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 187, in check_error
> raise self.error
> InternalError: Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 496, in dispatch
> self.engine.dispatch()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 791, in dispatch
> self.attach(ssn)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 834, in attach
> self.link(rcv, self._in, rcv.source)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 885, in link
> dir.do_unlink(sst, lnk, _lnk)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 261, in do_unlink
> sst.write_cmds(cmds, action)
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
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[jira] [Updated] (QPID-3218) AttributeError: 'NoneType' object has
no attribute 'write_cmds'
Posted by "Gordon Sim (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/QPID-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gordon Sim updated QPID-3218:
-----------------------------
Attachment: test.py
The attached simple test results in a similar error:
qpid.messaging.exceptions.InternalError: Traceback (most recent call last):
File "/home/gordon/projects/qpid-svn-trunk/python/qpid/messaging/driver.py", line 507, in dispatch
self.engine.dispatch()
File "/home/gordon/projects/qpid-svn-trunk/python/qpid/messaging/driver.py", line 810, in dispatch
self.attach(ssn)
File "/home/gordon/projects/qpid-svn-trunk/python/qpid/messaging/driver.py", line 851, in attach
self.link(snd, self._out, snd.target)
File "/home/gordon/projects/qpid-svn-trunk/python/qpid/messaging/driver.py", line 894, in link
self.resolve_declare(sst, _lnk, dir.DIR_NAME, resolved)
File "/home/gordon/projects/qpid-svn-trunk/python/qpid/messaging/driver.py", line 955, in resolve_declare
self.resolve(sst, lnk.name, do_resolved, force=declare)
File "/home/gordon/projects/qpid-svn-trunk/python/qpid/messaging/driver.py", line 981, in resolve
sst.write_query(ExchangeQuery(name), do_result)
AttributeError: 'NoneType' object has no attribute 'write_query'
Attaching in case reproducing that sheds light on the larger issue. (note this is the same test as for the unrelated QPID-3242 but with the actual send/fetch commented out).
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
> ---------------------------------------------------------------
>
> Key: QPID-3218
> URL: https://issues.apache.org/jira/browse/QPID-3218
> Project: Qpid
> Issue Type: Bug
> Components: Python Client
> Affects Versions: 0.7
> Environment: OS=RHEL6
> python-qpid-0.7.946106-12.el6.noarch
> qpid-cpp-client-0.7.946106-5.el6.x86_64
> qpid-cpp-server-0.7.946106-5.el6.x86_64
> qpid broker on main server and all the nodes are
> vm's with bridged configuration in a single network.
> Reporter: Jeff Ortel
> Attachments: test.py
>
>
> 2011-04-19 22:05:07,321 [ERROR][asynctaskreplyqueue] __fetch() @ consumer.py:90 - asynctaskreplyqueue
> Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/gofer/messaging/consumer.py", line 86, in __fetch
> return self.receiver.fetch(timeout=self.WAIT)
> File "<string>", line 6, in fetch
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 994, in fetch
> self._ecwait(lambda: self.linked)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 50, in _ecwait
> result = self._ewait(lambda: self.closed or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 957, in _ewait
> result = self.session._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 550, in _ewait
> result = self.connection._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 194, in _ewait
> self.check_error()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 187, in check_error
> raise self.error
> InternalError: Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 496, in dispatch
> self.engine.dispatch()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 791, in dispatch
> self.attach(ssn)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 834, in attach
> self.link(rcv, self._in, rcv.source)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 885, in link
> dir.do_unlink(sst, lnk, _lnk)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 261, in do_unlink
> sst.write_cmds(cmds, action)
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
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[jira] [Resolved] (QPID-3218) AttributeError: 'NoneType' object has
no attribute 'write_cmds'
Posted by "Gordon Sim (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/QPID-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gordon Sim resolved QPID-3218.
------------------------------
Resolution: Fixed
Fix Version/s: 0.11
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
> ---------------------------------------------------------------
>
> Key: QPID-3218
> URL: https://issues.apache.org/jira/browse/QPID-3218
> Project: Qpid
> Issue Type: Bug
> Components: Python Client
> Affects Versions: 0.7
> Environment: OS=RHEL6
> python-qpid-0.7.946106-12.el6.noarch
> qpid-cpp-client-0.7.946106-5.el6.x86_64
> qpid-cpp-server-0.7.946106-5.el6.x86_64
> qpid broker on main server and all the nodes are
> vm's with bridged configuration in a single network.
> Reporter: Jeff Ortel
> Assignee: Gordon Sim
> Fix For: 0.11
>
> Attachments: test.py
>
>
> 2011-04-19 22:05:07,321 [ERROR][asynctaskreplyqueue] __fetch() @ consumer.py:90 - asynctaskreplyqueue
> Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/gofer/messaging/consumer.py", line 86, in __fetch
> return self.receiver.fetch(timeout=self.WAIT)
> File "<string>", line 6, in fetch
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 994, in fetch
> self._ecwait(lambda: self.linked)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 50, in _ecwait
> result = self._ewait(lambda: self.closed or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 957, in _ewait
> result = self.session._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 550, in _ewait
> result = self.connection._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 194, in _ewait
> self.check_error()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 187, in check_error
> raise self.error
> InternalError: Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 496, in dispatch
> self.engine.dispatch()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 791, in dispatch
> self.attach(ssn)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 834, in attach
> self.link(rcv, self._in, rcv.source)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 885, in link
> dir.do_unlink(sst, lnk, _lnk)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 261, in do_unlink
> sst.write_cmds(cmds, action)
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
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[jira] [Commented] (QPID-3218) AttributeError: 'NoneType' object
has no attribute 'write_cmds'
Posted by "Gordon Sim (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/QPID-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13031201#comment-13031201 ]
Gordon Sim commented on QPID-3218:
----------------------------------
I believe what is happening here is that a session_dectahed can result in the SessionState being removed from the attachments map, but the Engine.attach() method will proceed regardless of that fact and may then hit these types of errors on any linking/unlinking work. This certainly explains my case above and could explain the original trace. It would however most likely be accompanied by some error in the broker logs.
Suggested fix:
{noformat}
Index: qpid/messaging/driver.py
===================================================================
--- qpid/messaging/driver.py (revision 1097458)
+++ qpid/messaging/driver.py (working copy)
@@ -828,8 +828,9 @@
self._closing = True
def attach(self, ssn):
+ if ssn.closed: return
sst = self._attachments.get(ssn)
- if sst is None and not ssn.closed:
+ if sst is None:
for i in xrange(0, self.channel_max):
if not self._sessions.has_key(i):
ch = i
{noformat}
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
> ---------------------------------------------------------------
>
> Key: QPID-3218
> URL: https://issues.apache.org/jira/browse/QPID-3218
> Project: Qpid
> Issue Type: Bug
> Components: Python Client
> Affects Versions: 0.7
> Environment: OS=RHEL6
> python-qpid-0.7.946106-12.el6.noarch
> qpid-cpp-client-0.7.946106-5.el6.x86_64
> qpid-cpp-server-0.7.946106-5.el6.x86_64
> qpid broker on main server and all the nodes are
> vm's with bridged configuration in a single network.
> Reporter: Jeff Ortel
> Attachments: test.py
>
>
> 2011-04-19 22:05:07,321 [ERROR][asynctaskreplyqueue] __fetch() @ consumer.py:90 - asynctaskreplyqueue
> Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/gofer/messaging/consumer.py", line 86, in __fetch
> return self.receiver.fetch(timeout=self.WAIT)
> File "<string>", line 6, in fetch
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 994, in fetch
> self._ecwait(lambda: self.linked)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 50, in _ecwait
> result = self._ewait(lambda: self.closed or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 957, in _ewait
> result = self.session._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 550, in _ewait
> result = self.connection._ewait(lambda: self.error or predicate(), timeout)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 194, in _ewait
> self.check_error()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/endpoints.py", line 187, in check_error
> raise self.error
> InternalError: Traceback (most recent call last):
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 496, in dispatch
> self.engine.dispatch()
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 791, in dispatch
> self.attach(ssn)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 834, in attach
> self.link(rcv, self._in, rcv.source)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 885, in link
> dir.do_unlink(sst, lnk, _lnk)
> File "/usr/lib/python2.6/site-packages/qpid/messaging/driver.py", line 261, in do_unlink
> sst.write_cmds(cmds, action)
> AttributeError: 'NoneType' object has no attribute 'write_cmds'
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