This is happening with me too. I installed a dockerized RB 
(https://github.com/ikatson/docker-reviewboard). Every time I kill and 
restart the docker (using 'docker stop'), I see the error mentioned above 
when click on any reviews or the svn repository link.

I am not modifying the DB manually, any SECRET_KEY in settings_local.py 
doesn't change too. This looks like a real bug in RB. I am using version 
2.5.7.

Thanks,
Shashi

On Wednesday, March 1, 2017 at 4:57:06 PM UTC-5, Christian Hammond wrote:
>
> Another thing to check is that your SECRET_KEY in settings_local.py hasn't 
> changed. If you're regenerating your site directory from scratch, this will 
> happen.
>
> Christian 
>
> On Wed, Mar 1, 2017 at 13:29 Christian Hammond <[email protected] 
> <javascript:>> wrote:
>
>> Hi,
>>
>> We've seen this happen when manually manipulating the contents of these 
>> columns in the table. Was there any database work being done via script or 
>> manual SQL manipulation?
>>
>> Basically, the code looks in the password column for a special character 
>> at the beginning (a tab). If present, the following data is expected to be 
>> encrypted. If not, it's a plain text password, which will then be encrypted.
>>
>> What can happen is if the tab was ever dropped, it would have seen the 
>> content as plain text and tried to re-encrypt it. The next decrypt would 
>> have then returned the binary content from the previous encryption, instead 
>> of valid UTF-8 content. This triggers the errors you see below.
>>
>> If this is happening occasionally, then these tables are being manually 
>> manipulated in some way that corrupts the field. Can you think of what may 
>> be running or what SQL work was done that would cause that?
>>
>> A common one is dumping the entries to the screen using SQL and then 
>> copy/pasting them back into the database (usually another database).
>>
>> You shouldn't delete the repository entries, though. Once I know what's 
>> going on, I can give you a solution for fixing up the passwords.
>>
>> Christian
>>
>>
>> On Wed, Mar 1, 2017 at 07:29 Michael Governale <[email protected] 
>> <javascript:>> wrote:
>>
>>> We ran into this issue twice this week. Going to review pages and 
>>> repository config pages is giving a 500 error. The log messages are below.
>>>
>>> The last time we deleted and recreated the repository configuration 
>>> pages. This loses the old / active reviews and isn't ideal.
>>>
>>> Any help or advice is appreciate. Thanks.
>>>
>>> Review Board 2.5.7
>>>
>>> Python warning:
>>>
>>>  - /usr/lib/python2.7/site-packages/feedparser.py:364: DeprecationWarning: 
>>> To avoid breaking existing software while fixing issue 310, a temporary 
>>> mapping has been created from `updated_parsed` to `published_parsed` if 
>>> `updated_parsed` doesn't exist. This fallback will be removed in a future 
>>> version of feedparser.
>>>   DeprecationWarning)
>>>
>>>
>>> Repository configuration error:
>>>
>>>  - Exception thrown for user at 
>>> http://reviewboard/admin/db/scmtools/repository/9/
>>>
>>> 'utf8' codec can't decode byte 0xbc in position 0: invalid start byte
>>> Traceback (most recent call last):
>>>   File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py", 
>>> line 112, in get_response
>>>     response = wrapped_callback(request, *callback_args, **callback_kwargs)
>>>   File "/usr/lib/python2.7/site-packages/django/contrib/admin/options.py", 
>>> line 465, in wrapper
>>>     return self.admin_site.admin_view(view)(*args, **kwargs)
>>>   File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 
>>> 99, in _wrapped_view
>>>     response = view_func(request, *args, **kwargs)
>>>   File "/usr/lib/python2.7/site-packages/django/views/decorators/cache.py", 
>>> line 52, in _wrapped_view_func
>>>     response = view_func(request, *args, **kwargs)
>>>   File "/usr/lib/python2.7/site-packages/django/contrib/admin/sites.py", 
>>> line 198, in inner
>>>     return view(request, *args, **kwargs)
>>>   File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 
>>> 29, in _wrapper
>>>     return bound_func(*args, **kwargs)
>>>   File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 
>>> 99, in _wrapped_view
>>>     response = view_func(request, *args, **kwargs)
>>>   File "/usr/lib/python2.7/site-packages/django/utils/decorators.py", line 
>>> 25, in bound_func
>>>     return func(self, *args2, **kwargs2)
>>>   File "/usr/lib/python2.7/site-packages/django/db/transaction.py", line 
>>> 371, in inner
>>>     return func(*args, **kwargs)
>>>   File "/usr/lib/python2.7/site-packages/django/contrib/admin/options.py", 
>>> line 1270, in change_view
>>>     form = ModelForm(instance=obj)
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/scmtools/forms.py", 
>>> line 431, in __init__
>>>     self._populate_repository_info_fields()
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/scmtools/forms.py", 
>>> line 517, in _populate_repository_info_fields
>>>     self.fields['password'].initial = self.instance.password
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/scmtools/models.py", 
>>> line 217, in _get_password
>>>     password = decrypt_password(password).decode('utf-8')
>>>   File "/usr/lib64/python2.7/encodings/utf_8.py", line 16, in decode
>>>     return codecs.utf_8_decode(input, errors, True)
>>> UnicodeDecodeError: 'utf8' codec can't decode byte 0xbc in position 0: 
>>> invalid start byte
>>>
>>>
>>>
>>> Review error:
>>>
>>>  - Exception thrown for user at http://reviewboard/r/19/
>>>
>>> 'utf8' codec can't decode byte 0xa9 in position 0: invalid start byte
>>> Traceback (most recent call last):
>>>   File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py", 
>>> line 112, in get_response
>>>     response = wrapped_callback(request, *callback_args, **callback_kwargs)
>>>   File 
>>> "/usr/lib/python2.7/site-packages/reviewboard/accounts/decorators.py", line 
>>> 25, in _check
>>>     return view_func(*args, **kwargs)
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/site/decorators.py", 
>>> line 35, in _check
>>>     return view_func(request, local_site=local_site, *args, **kwargs)
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/reviews/views.py", 
>>> line 780, in review_detail
>>>     'screenshots': screenshots,
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/reviews/context.py", 
>>> line 99, in make_review_request_context
>>>     upload_diff_form = UploadDiffForm(review_request, request=request)
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/reviews/forms.py", 
>>> line 127, in __init__
>>>     data, *args, **kwargs)
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/diffviewer/forms.py", 
>>> line 41, in __init__
>>>     if self.repository.get_scmtool().get_diffs_use_absolute_paths():
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/scmtools/models.py", 
>>> line 231, in get_scmtool
>>>     return cls(self)
>>>   File 
>>> "/usr/lib/python2.7/site-packages/reviewboard/scmtools/svn/__init__.py", 
>>> line 69, in __init__
>>>     credentials = repository.get_credentials()
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/scmtools/models.py", 
>>> line 281, in get_credentials
>>>     password = self.password
>>>   File "/usr/lib/python2.7/site-packages/reviewboard/scmtools/models.py", 
>>> line 217, in _get_password
>>>     password = decrypt_password(password).decode('utf-8')
>>>   File "/usr/lib64/python2.7/encodings/utf_8.py", line 16, in decode
>>>     return codecs.utf_8_decode(input, errors, True)
>>> UnicodeDecodeError: 'utf8' codec can't decode byte 0xa9 in position 0: 
>>> invalid start byte
>>>
>>> -- 
>>> Supercharge your Review Board with Power Pack: 
>>> https://www.reviewboard.org/powerpack/
>>> Want us to host Review Board for you? Check out RBCommons: 
>>> https://rbcommons.com/
>>> Happy user? Let us know! https://www.reviewboard.org/users/
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>>>
>> -- 
>> -- 
>> Christian Hammond
>> President/CEO of Beanbag <https://www.beanbaginc.com/>
>> Makers of Review Board <https://www.reviewboard.org/>
>>
> -- 
> -- 
> Christian Hammond
> President/CEO of Beanbag <https://www.beanbaginc.com/>
> Makers of Review Board <https://www.reviewboard.org/>
>

-- 
Supercharge your Review Board with Power Pack: 
https://www.reviewboard.org/powerpack/
Want us to host Review Board for you? Check out RBCommons: 
https://rbcommons.com/
Happy user? Let us know! https://www.reviewboard.org/users/
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