[Mailman-Users] Stack dump trying to "Approve" postings

[Rosenbaum, Larry M.]

We are running mailman-2.1.12-18.el6.x86_64, python 2.6.6, RHEL6. Sometimes when a moderator tries to approve postings, he gets this error:

"Bug in Mailman version 2.1.12
We're sorry, we hit a bug!

Please inform the webmaster for this site of this problem. Printing of traceback and other system information has been explicitly inhibited, but the webmaster can find this information in the Mailman error logs."

I have checked the traceback and found the following. What does it mean, and how do we fix it?

Dec 03 09:48:57 2013 admin(20706): @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
admin(20706): [----- Mailman Version: 2.1.12 -----]
admin(20706): [----- Traceback ------]
admin(20706): Traceback (most recent call last):
admin(20706):   File "/usr/lib/mailman/scripts/driver", line 112, in run_main
admin(20706):     main()
admin(20706):   File "/usr/lib/mailman/Mailman/Cgi/admindb.py", line 165, in main
admin(20706):     process_form(mlist, doc, cgidata)
admin(20706):   File "/usr/lib/mailman/Mailman/Cgi/admindb.py", line 716, in process_form
admin(20706):     forward, forwardaddr)
admin(20706):   File "/usr/lib/mailman/Mailman/ListAdmin.py", line 167, in HandleRequest
admin(20706):     forward, addr)
admin(20706):   File "/usr/lib/mailman/Mailman/ListAdmin.py", line 254, in __handlepost
admin(20706):     g(msg, 1)
admin(20706): AttributeError: Generator instance has no __call__ method
admin(20706): [----- Python Information -----]
admin(20706): sys.version     =   2.6.6 (r266:84292, May 27 2013, 05:35:12)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)]
admin(20706): sys.executable  =   /usr/bin/python
admin(20706): sys.prefix      =   /usr
admin(20706): sys.exec_prefix =   /usr
admin(20706): sys.path        =   /usr
admin(20706): sys.platform    =   linux2
admin(20706): [----- Environment Variables -----]
admin(20706):   HTTP_COOKIE: grayhive+admin=<snip>
admin(20706):   SERVER_SOFTWARE: Apache/2.2.15 (Red Hat)
admin(20706):   SCRIPT_NAME: /mailman/admindb
admin(20706):   SERVER_SIGNATURE: <address>Apache/2.2.15 (Red Hat) Server at email.ornl.gov Port 443</address>
admin(20706):
admin(20706):   REQUEST_METHOD: POST
admin(20706):   PATH_INFO: /grayhive
admin(20706):   HTTP_ORIGIN: https://email.ornl.gov
admin(20706):   SERVER_PROTOCOL: HTTP/1.1
admin(20706):   QUERY_STRING:
admin(20706):   SSL_TLS_SNI: email.ornl.gov
admin(20706):   CONTENT_LENGTH: 225
admin(20706):   HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_5) AppleWebKit/536.30.1 (KHTML, like Gecko) Version/6.0.5 Safari/536.30.1
admin(20706):   HTTP_CONNECTION: keep-alive
admin(20706):   HTTP_REFERER: https://email.ornl.gov/mailman/admindb/grayhive
admin(20706):   SERVER_NAME: email.ornl.gov
admin(20706):   REMOTE_ADDR: 160.91.240.104
admin(20706):   PATH_TRANSLATED: /var/www/html/grayhive
admin(20706):   SERVER_PORT: 443
admin(20706):   SERVER_ADDR: 160.91.4.92
admin(20706):   DOCUMENT_ROOT: /var/www/html
admin(20706):   PYTHONPATH: /usr/lib/mailman
admin(20706):   SCRIPT_FILENAME: /usr/lib/mailman/cgi-bin/admindb
admin(20706):   SERVER_ADMIN: root at localhost
admin(20706):   HTTP_DNT: 1
admin(20706):   HTTP_HOST: email.ornl.gov
admin(20706):   HTTPS: on
admin(20706):   REQUEST_URI: /mailman/admindb/grayhive
admin(20706):   HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
admin(20706):   GATEWAY_INTERFACE: CGI/1.1
admin(20706):   REMOTE_PORT: 52988
admin(20706):   HTTP_ACCEPT_LANGUAGE: en-us
admin(20706):   CONTENT_TYPE: application/x-www-form-urlencoded
admin(20706):   HTTP_ACCEPT_ENCODING: gzip, deflate