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<div class="moz-cite-prefix">On 08/21/2012 03:49 PM,
<a class="moz-txt-link-abbreviated" href="mailto:michel.gauthier@bull.net">michel.gauthier@bull.net</a> wrote:<br>
</div>
<blockquote
cite="mid:OF22039CE3.CCCA89B6-ONC1257A61.004A4033-C1257A61.004BE7D3@bull.net"
type="cite"><font size="2" face="sans-serif">I have installed
winpdb, but I have still
a problem while debugging nova-scheduler service : </font>
<br>
<br>
<font size="2" face="sans-serif">on </font><tt><font size="2">eventlet.monkey_patch()</font></tt><font
size="2" face="sans-serif">
instruction, the debugger get the following exception :</font>
<br>
<br>
<br>
<font size="2" face="sans-serif">on winpdb GUI session ( launched
thru
: winpdb command and then atteched to the debugee session)</font>
<br>
<font size="2" face="sans-serif">Exception in thread Thread-57:</font>
<br>
<font size="2" face="sans-serif">Traceback (most recent call
last):</font>
<br>
<font size="2" face="sans-serif"> File
"/usr/lib/python2.7/threading.py",
line 551, in __bootstrap_inner</font>
<br>
<font size="2" face="sans-serif"> self.run()</font>
<br>
<font size="2" face="sans-serif"> File
"/usr/lib/python2.7/threading.py",
line 504, in run</font>
<br>
<font size="2" face="sans-serif"> self.__target(*self.__args,
**self.__kwargs)</font>
<br>
<font size="2" face="sans-serif"> File
"/usr/local/lib/python2.7/dist-packages/rpdb2.py",
line 10790, in __event_monitor_proc</font>
<br>
<font size="2" face="sans-serif"> (n, sel) =
self.getSession().getProxy().wait_for_event(PING_TIMEOUT,
self.m_remote_event_index)</font>
<br>
<font size="2" face="sans-serif"> File
"/usr/lib/python2.7/xmlrpclib.py",
line 1224, in __call__</font>
<br>
<font size="2" face="sans-serif"> return
self.__send(self.__name,
args)</font>
<br>
<font size="2" face="sans-serif"> File
"/usr/local/lib/python2.7/dist-packages/rpdb2.py",
line 9520, in __request</font>
<br>
<font size="2" face="sans-serif"> raise _e</font>
<br>
<font size="2" face="sans-serif">RuntimeError: cannot release
un-acquired
lock</font>
<br>
<br>
<br>
<font size="2" face="sans-serif">on winpdb debugee session
(launched
thru : winpdb -d /usr/bin/nova-scheduler
--flagfile=/etc/nova/nova.conf
command)</font>
<br>
<font size="2" face="sans-serif">Exception in thread
__worker_target:</font>
<br>
<font size="2" face="sans-serif">Traceback (most recent call
last):</font>
<br>
<font size="2" face="sans-serif"> File
"/usr/lib/python2.7/threading.py",
line 551, in __bootstrap_inner</font>
<br>
<font size="2" face="sans-serif"> self.run()</font>
<br>
<font size="2" face="sans-serif"> File
"/usr/local/lib/python2.7/dist-packages/rpdb2.py",
line 4574, in run</font>
<br>
<font size="2" face="sans-serif"> threading.Thread.run(self)</font>
<br>
<font size="2" face="sans-serif"> File
"/usr/lib/python2.7/threading.py",
line 504, in run</font>
<br>
<font size="2" face="sans-serif"> self.__target(*self.__args,
**self.__kwargs)</font>
<br>
<font size="2" face="sans-serif"> File
"/usr/local/lib/python2.7/dist-packages/rpdb2.py",
line 9361, in __worker_target</font>
<br>
<font size="2" face="sans-serif"> self.m_lock.release()</font>
<br>
<font size="2" face="sans-serif"> File
"/usr/lib/python2.7/threading.py",
line 142, in release</font>
<br>
<font size="2" face="sans-serif"> raise RuntimeError("cannot
release un-acquired lock")</font>
<br>
<font size="2" face="sans-serif">RuntimeError: cannot release
un-acquired
lock</font>
<br>
<br>
<br>
<font size="2" face="sans-serif">Help for a solution.</font>
<br>
<br>
<br>
<br>
<br>
<br>
<font size="1" face="sans-serif" color="#5f5f5f">De :
</font><font size="1" face="sans-serif">Michael J Fork
<a class="moz-txt-link-rfc2396E" href="mailto:mjfork@us.ibm.com"><mjfork@us.ibm.com></a></font>
<br>
<font size="1" face="sans-serif" color="#5f5f5f">A :
</font><font size="1" face="sans-serif">OpenStack Development
Mailing List <a class="moz-txt-link-rfc2396E" href="mailto:openstack-dev@lists.openstack.org"><openstack-dev@lists.openstack.org></a></font>
<br>
<font size="1" face="sans-serif" color="#5f5f5f">Date :
</font><font size="1" face="sans-serif">17/08/2012 15:03</font>
<br>
<font size="1" face="sans-serif" color="#5f5f5f">Objet :
</font><font size="1" face="sans-serif">Re: [openstack-dev]
Problem with debugging program having
eventlet.monkey_patch() code</font>
<br>
<hr noshade="noshade">
<br>
<br>
<br>
<font size="2" face="sans-serif">We have found that Winpdb (</font><a
moz-do-not-send="true" href="http://winpdb.org/"><font size="2"
face="sans-serif" color="blue"><u>http://winpdb.org/</u></font></a><font
size="2" face="sans-serif">
- platform independent despite Win in the name) works well with
multi-threaded
Python. While using PyDev for development, run Winpdb as a
remote
debugger for the multithreaded service. Flow is like this:</font><font
size="3"><br>
</font><font size="2" face="sans-serif"><br>
Launch Winpdb GUI<br>
# winpdb</font><font size="3"><br>
</font><font size="2" face="sans-serif"><br>
Start Debugging <br>
# cd /home/openstack-dev/workspace/nova/bin <br>
# winpdb -d -r <file_to_debug> <br>
Set Password: openstack </font><font size="3"><br>
</font><font size="2" face="sans-serif"><br>
Attach to Process<br>
1) In Winpdb GUI, select File -> Attach<br>
2) Enter password from step 4, should display files associated
with that
password <br>
3) Select process/file then select OK <br>
<br>
To Stop Debug or Make Changes and Restart <br>
1) File -> Stop to detach current debugger <br>
2) Make changes in Eclipse and Save (make sure development user
has write
privileges to repository) <br>
3) kill and restart winpdb debugging process started above<br>
4) Re-attach to the process in the Winpdb GUI<br>
<br>
Michael<br>
<br>
-------------------------------------------------<br>
Michael Fork<br>
Cloud Architect, Emerging Solutions<br>
IBM Systems & Technology Group</font><font size="3"><br>
</font><tt><font size="2"><br>
<a class="moz-txt-link-abbreviated" href="mailto:michel.gauthier@bull.net">michel.gauthier@bull.net</a> wrote on 08/17/2012 07:59:18 AM:<br>
<br>
> From: <a class="moz-txt-link-abbreviated" href="mailto:michel.gauthier@bull.net">michel.gauthier@bull.net</a><br>
> To: <a class="moz-txt-link-abbreviated" href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>, <br>
> Date: 08/17/2012 08:02 AM<br>
> Subject: [openstack-dev] Problem with debugging program
having <br>
> eventlet.monkey_patch() code<br>
> <br>
> Hi all, <br>
> I want to debug nova-scheduler service (Essex version)
code
with <br>
> Eclipse->Pydev->Debug Configuration. <br>
> But when I launch it under Debug Configuration, I get the
following
<br>
> error messages : <br>
> <br>
> pydev debugger: starting <br>
> Traceback (most recent call last): <br>
> File
"/usr/lib/python2.7/dist-packages/eventlet/hubs/hub.py",
line<br>
> 336, in fire_timers <br>
> timer() <br>
> File
"/usr/lib/python2.7/dist-packages/eventlet/hubs/timer.py",
<br>
> line 56, in __call__ <br>
> cb(*args, **kw) <br>
> File
"/usr/lib/python2.7/dist-packages/eventlet/semaphore.py",
<br>
> line 95, in _do_acquire <br>
> waiter.switch() <br>
> error: cannot switch to a different thread <br>
> <br>
> and then, Pydev debugger does not work! <br>
> <br>
> In fact, these errors are due to the use of
eventlet.monkey_patch()
inside <br>
> nova-scheduler launcher (as well as inside other nova-*
launchers).
<br>
> <br>
> Do you have any ideas to resolve this problem? <br>
> <br>
> Thanks in
advance._______________________________________________<br>
> OpenStack-dev mailing list<br>
> <a class="moz-txt-link-abbreviated" href="mailto:OpenStack-dev@lists.openstack.org">OpenStack-dev@lists.openstack.org</a><br>
> </font></tt><a moz-do-not-send="true"
href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev"><tt><font
size="2" color="blue"><u>http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</u></font></tt></a><tt><font
size="2">_______________________________________________<br>
OpenStack-dev mailing list<br>
<a class="moz-txt-link-abbreviated" href="mailto:OpenStack-dev@lists.openstack.org">OpenStack-dev@lists.openstack.org</a><br>
</font></tt><a moz-do-not-send="true"
href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev"><tt><font
size="2">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</font></tt></a><tt><font
size="2"><br>
</font></tt>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
OpenStack-dev mailing list
<a class="moz-txt-link-abbreviated" href="mailto:OpenStack-dev@lists.openstack.org">OpenStack-dev@lists.openstack.org</a>
<a class="moz-txt-link-freetext" href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a>
</pre>
</blockquote>
As a quick workaround you can change monkey patching at
nova-scheduler script:<br>
<br>
eventlet.monkey_patch(thread=False)<br>
<br>
HTH<br>
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