<html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> <div class="moz-cite-prefix">Il 12/06/2013 19:31, Cole Robinson ha scritto: </div> <blockquote cite="mid:51B8B07E.8060807@redhat.com" type="cite"> <pre wrap="">On 06/12/2013 04:10 AM, Sandro Bonazzola wrote: </pre> <blockquote type="cite"> <pre wrap="">Il 11/06/2013 18:21, Cole Robinson ha scritto: </pre> <blockquote type="cite"> <pre wrap="">On 06/11/2013 07:58 AM, Sandro Bonazzola wrote: </pre> <blockquote type="cite"> <pre wrap="">Hi, using vdsm python code, I've the following error at program exit that seems to be related to libvirt python code, something wrong in a destructor: Exception AttributeError: AttributeError("virConnect instance has no attribute 'domainEventCallbacks'",) in <bound method virConnect.__del__ of <libvirt.virConnect instance at 0x4280f38>> ignored I'm using libvirt 1.0.6 Is it a known issue? Is there any workaround / fix ? </pre> </blockquote> <pre wrap="">I've seen this too, sometimes via the virtinst test suite. Once upon a time I tracked it down to whether the virtinst code did 'import selinux' or not, so maybe it's a just some weird race, or a side effect of something other libraries do in their cleanup path. By inspection alone the __del__ handler doesn't seem to be doing anything wrong. - Cole </pre> </blockquote> <pre wrap=""> It seems related only to domainEventCallbacks so maybe it appears only after a domain creation / modification. </pre> </blockquote> <pre wrap=""> Oh, sorry, now that I look at the code it makes a bit more sense. The error I was recalling was a __del__ Exception but wasn't involving domain events. But I still don't see why __del__ is complaining, since the whole thing is wrapped in try: ... except AttributeError. So not sure what the issue is. - Cole </pre> </blockquote> According to the python documentation, you can't handle exception in __del__: <a class="moz-txt-link-freetext" href="http://docs.python.org/2/reference/datamodel.html#object.__del__">http://docs.python.org/2/reference/datamodel.html#object.__del__</a> Warning Due to the precarious circumstances under which <a class="reference internal" href="http://docs.python.org/2/reference/datamodel.html#object.__del__" title="object.__del__"><tt class="xref py py-meth docutils literal">__del__()</tt></a> methods are invoked, exceptions that occur during their execution are ignored, and a warning is printed to <tt class="docutils literal">sys.stderr</tt> instead. So you have to test the existence of the attribute before using it and not try to use it and try to handle an exception that can't be handled. <pre class="moz-signature" cols="72">-- Sandro Bonazzola Better technology. Faster innovation. Powered by community collaboration. See how it works at redhat.com</pre> </body> </html>