ValueError: list.remove(x): x not in list

[gwe@…]

How to Reproduce

While doing a POST operation on /query, Trac issued an internal error.

I did a batch modify on about 50 tickets (moving them from in_QA to fixed). The error appeared on hitting Submit.

Request parameters:

{'__FORM_TOKEN': u'970418cd0f31aec48ff3a90b',
 'batchmod_modify_changetime': u'true',
 'batchmod_submit': u'Change tickets',
 'batchmod_value_comment': u'Closing a number of tickets which have been in_QA for a long time.',
 'batchmod_value_resolution': u'fixed',
 'batchmod_value_status': u'closed',
 'query_href': u'/trac/powerflarm/query?status=in_QA&col=id&col=summary&col=status&col=type&col=priority&col=milestone&col=component&order=priority',
 'selectedTickets': u'16,147,148,160,166,203,281,293,365,175,182,256,369,372,55,98,101,126,132,133,134,144,152,153,165,188,189,192,195,229,243,253,254,265,276,277,314,336,366,73,114,161,162,163,164,172,179,185,190,193,194,201,231,262,316,318,117,288,327'}

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.168 Safari/535.19

System Information

Trac	0.12
Genshi	0.6
mod_python	3.3.1
pysqlite	2.4.1
Python	2.5.2 (r252:60911, Jan 24 2010, 15:24:24) [GCC 4.3.2]
setuptools	0.6c8
SQLite	3.5.9
Subversion	1.5.1 (r32289)
jQuery	1.4.2

Enabled Plugins

BatchModify	0.8.0-trac0.12
TracAccountManager	0.3dev-r9785
TracCustomRoadmap	0.4
TracMasterTickets	3.0.2
TracRevtreePlugin	0.6.4dev-r8057
TracWysiwyg	0.12.0.3

Python Traceback

Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 513, in _dispatch_request
    dispatcher.dispatch(req)
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 200, in dispatch
    chosen_handler)
  File "build/bdist.linux-x86_64/egg/trac/web/main.py", line 346, in _pre_process_request
    chosen_handler = filter_.pre_process_request(req, chosen_handler)
  File "/var/lib/trac/powerflarm/plugins/BatchModify-0.8.0_trac0.12-py2.5.egg/batchmod/web_ui.py", line 71, in pre_process_request
    batch_modifier.process_request(req, self.env, self.log)
  File "/var/lib/trac/powerflarm/plugins/BatchModify-0.8.0_trac0.12-py2.5.egg/batchmod/web_ui.py", line 158, in process_request
    values, comment, modify_changetime, send_notifications)
  File "/var/lib/trac/powerflarm/plugins/BatchModify-0.8.0_trac0.12-py2.5.egg/batchmod/web_ui.py", line 194, in _save_ticket_changes
    @with_transaction(env)
  File "build/bdist.linux-x86_64/egg/trac/db/api.py", line 77, in transaction_wrapper
    fn(ldb)
  File "/var/lib/trac/powerflarm/plugins/BatchModify-0.8.0_trac0.12-py2.5.egg/batchmod/web_ui.py", line 213, in _implementation
    t.save_changes(req.authname, comment, when=new_changetime)
  File "build/bdist.linux-x86_64/egg/trac/ticket/model.py", line 353, in save_changes
    listener.ticket_changed(self, comment, author, old_values)
  File "build/bdist.linux-x86_64/egg/mastertickets/api.py", line 111, in ticket_changed
    links.save(author, comment, tkt.time_changed, db)
  File "build/bdist.linux-x86_64/egg/mastertickets/model.py", line 68, in save
    update_field(new_value)
  File "build/bdist.linux-x86_64/egg/mastertickets/model.py", line 61, in <lambda>
    update_field = lambda lst: lst.remove(str(self.tkt.id))
ValueError: list.remove(x): x not in list

[Jun Omae]

This is ​th:MasterTicketsPlugin issue (PluginIssue). The same issue already has been reported at ​th:#8792.