IndexError when starting trac

[Franz]

When trying to go to Trac startpage, I get an "Internal Server Error". When looking into trac.log, there some IndexError in method _get_name_for_cookie (see full traceback below).

There are several entries in table auth_cookie.

What I did:

• Copying database dump and files (including svn) from productive server to test server
• Starting test server: getting this error
• Updgrading to Trac 1.1.6 (before was 1.1.1, but I have tried 1.1.3 beforehand and reverted to 1.1.1)
• Starting test server: still getting this error
• Updgrading Acct-Mgr to newest version: still getting this error
• Disabling Acct-Mgr: Trac works fine

My Environment:

• Trac 1.1.6
• PostgreSQL 9.3.6
• Python 2.7.6
• running under Apache/2.4.7 and Ubuntu 14.04

Full Traceback

2015-09-04 11:00:42,089 Trac[build\bdist.win32\egg\trac\web\main] ERROR: Exception caught while post-processing request:
Traceback (most recent call last):
  File "build\bdist.win32\egg\trac\web\main.py", line 276, in dispatch
    self._post_process_request(req)
  File "build\bdist.win32\egg\trac\web\main.py", line 424, in _post_process_request
    f.post_process_request(req, *(None,)*extra_arg_count)
  File "build\bdist.win32\egg\navigationplugin\navigation.py", line 72, in post_process_request
    display = self.get_display(req)
  File "build\bdist.win32\egg\navigationplugin\navigation.py", line 145, in get_display
    return self.__get_pref_value(req, 'nav') or self.display_navigation
  File "build\bdist.win32\egg\navigationplugin\navigation.py", line 163, in __get_pref_value
    if req.session.has_key(SESSION_KEYS[session_key]):
  File "build\bdist.win32\egg\trac\web\api.py", line 389, in __getattr__
    value = self.callbacks[name](self)
  File "build\bdist.win32\egg\trac\web\main.py", line 327, in _get_session
    return Session(self.env, req)
  File "build\bdist.win32\egg\trac\web\session.py", line 203, in __init__
    if req.authname == 'anonymous':
  File "build\bdist.win32\egg\trac\web\api.py", line 389, in __getattr__
    value = self.callbacks[name](self)
  File "build\bdist.win32\egg\trac\web\main.py", line 160, in authenticate
    authname = authenticator.authenticate(req)
  File "build\bdist.win-amd64\egg\acct_mgr\util.py", line 81, in wrap
    return func(self, *args, **kwds)
  File "build\bdist.win-amd64\egg\acct_mgr\web_ui.py", line 425, in authenticate
    return auth.LoginModule.authenticate(self, req)
  File "build\bdist.win32\egg\trac\web\auth.py", line 90, in authenticate
    req.incookie['trac_auth'])
  File "build\bdist.win-amd64\egg\acct_mgr\web_ui.py", line 502, in _get_name_for_cookie
    name = self.env.db_query(sql, args)[0]
IndexError: list index out of range
2015-09-04 11:00:42,090 Trac[build\bdist.win32\egg\trac\web\main] ERROR: Internal Server Error:
Traceback (most recent call last):
  File "build\bdist.win32\egg\trac\web\main.py", line 587, in _dispatch_request
    dispatcher.dispatch(req)
  File "build\bdist.win32\egg\trac\web\main.py", line 207, in dispatch
    chosen_handler = self._get_valid_default_handler(req)
  File "build\bdist.win32\egg\trac\web\main.py", line 300, in _get_valid_default_handler
    name = req.session.get('default_handler')
  File "build\bdist.win32\egg\trac\web\api.py", line 389, in __getattr__
    value = self.callbacks[name](self)
  File "build\bdist.win32\egg\trac\web\main.py", line 327, in _get_session
    return Session(self.env, req)
  File "build\bdist.win32\egg\trac\web\session.py", line 203, in __init__
    if req.authname == 'anonymous':
  File "build\bdist.win32\egg\trac\web\api.py", line 389, in __getattr__
    value = self.callbacks[name](self)
  File "build\bdist.win32\egg\trac\web\main.py", line 160, in authenticate
    authname = authenticator.authenticate(req)
  File "build\bdist.win-amd64\egg\acct_mgr\util.py", line 81, in wrap
    return func(self, *args, **kwds)
  File "build\bdist.win-amd64\egg\acct_mgr\web_ui.py", line 425, in authenticate
    return auth.LoginModule.authenticate(self, req)
  File "build\bdist.win32\egg\trac\web\auth.py", line 90, in authenticate
    req.incookie['trac_auth'])
  File "build\bdist.win-amd64\egg\acct_mgr\web_ui.py", line 502, in _get_name_for_cookie
    name = self.env.db_query(sql, args)[0]
IndexError: list index out of range

[Franz]

I had some error with old templates of Trac (see ​Trac Ticket #11736); after fixing that issue I get following error:

  File "build\bdist.win-amd64\egg\acct_mgr\web_ui.py", line 425, in authenticate
    return auth.LoginModule.authenticate(self, req)
  File "build\bdist.win32\egg\trac\web\auth.py", line 90, in authenticate
    req.incookie['trac_auth'])
  File "build\bdist.win-amd64\egg\acct_mgr\web_ui.py", line 496, in _get_name_for_cookie
    db = self.env.get_db_cnx()
AttributeError: 'Environment' object has no attribute 'get_db_cnx'

This problem has already been reported with #11915, so I close this ticket as duplicate.