Hi,

We have recently upgraded our ReviewBoard from version 1.7.22 to 2.5.10 - 
as well as also upgrading from RHEL 6.x to CentOS 7.3.1611.
Since then we have a review that cannot be interacted with...can't post a 
new review or comment, adjust existing comments etc - or even delete the 
review.
We get a "HTTP 500 INTERNAL SERVER ERROR" from the browser and the 
following error in the ReviewBoard logs:

--------------------------------

None - admin - /api/review-requests/27393/ - Exception thrown for user admin at 
http://reviews/api/review-requests/27393/?api_format=json&force-text-type=html&include-text-types=raw

(1062, "Duplicate entry '1701871-1' for key 'reviews_reviewrequest_b8c24015'")
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/views/decorators/cache.py", 
line 52, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/django/views/decorators/vary.py", line 
19, in inner_func
    response = func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/djblets/webapi/resources/base.py", 
line 196, in __call__
    request, method, view, api_format=api_format, *args, **kwargs)
  File 
"/usr/lib/python2.7/site-packages/djblets/webapi/resources/mixins/api_tokens.py",
 line 65, in call_method_view
    return view(request, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/djblets/util/decorators.py", line 75, 
in _call
    f = augmented_func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/djblets/webapi/decorators.py", line 
122, in _call
    return view_func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/reviewboard/webapi/decorators.py", 
line 36, in _check
    return view_func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/djblets/webapi/decorators.py", line 
122, in _call
    return view_func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/reviewboard/webapi/decorators.py", 
line 139, in _check
    return view_func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/djblets/util/decorators.py", line 75, 
in _call
    f = augmented_func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/djblets/webapi/decorators.py", line 
122, in _call
    return view_func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/djblets/webapi/resources/base.py", 
line 488, in get
    etag = self.get_etag(request, obj, **kwargs)
  File "/usr/lib/python2.7/site-packages/djblets/webapi/resources/base.py", 
line 1134, in get_etag
    encode_etag=False, **kwargs)
  File "/usr/lib/python2.7/site-packages/djblets/webapi/resources/base.py", 
line 1162, in generate_etag
    etag = repr(self.serialize_object(obj, request=request, **kwargs))
  File "/usr/lib/python2.7/site-packages/reviewboard/webapi/mixins.py", line 
60, in serialize_object
    obj, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/djblets/webapi/resources/base.py", 
line 774, in serialize_object
    value = serialize_func(obj, request=request)
  File 
"/usr/lib/python2.7/site-packages/reviewboard/webapi/resources/review_request.py",
 line 561, in serialize_commit_id_field
    return obj.commit
  File 
"/usr/lib/python2.7/site-packages/reviewboard/reviews/models/review_request.py",
 line 273, in get_commit
    commit_id=six.text_type(self.changenum))
  File "/usr/lib/python2.7/site-packages/django/db/models/query.py", line 493, 
in update
    rows = query.get_compiler(self.db).execute_sql(None)
  File "/usr/lib/python2.7/site-packages/django/db/models/sql/compiler.py", 
line 980, in execute_sql
    cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
  File "/usr/lib/python2.7/site-packages/django/db/models/sql/compiler.py", 
line 786, in execute_sql
    cursor.execute(sql, params)
  File "/usr/lib/python2.7/site-packages/django/db/backends/util.py", line 53, 
in execute
    return self.cursor.execute(sql, params)
  File "/usr/lib/python2.7/site-packages/django/db/utils.py", line 99, in 
__exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/usr/lib/python2.7/site-packages/django/db/backends/util.py", line 53, 
in execute
    return self.cursor.execute(sql, params)
  File "/usr/lib/python2.7/site-packages/django/db/backends/mysql/base.py", 
line 124, in execute
    return self.cursor.execute(query, args)
  File "/usr/lib64/python2.7/site-packages/MySQLdb/cursors.py", line 205, in 
execute
    self.errorhandler(self, exc, value)
  File "/usr/lib64/python2.7/site-packages/MySQLdb/connections.py", line 36, in 
defaulterrorhandler
    raise errorclass, errorvalue
IntegrityError: (1062, "Duplicate entry '1701871-1' for key 
'reviews_reviewrequest_b8c24015'")


--------------------------------


I've seen another similar post on this forum but no resolution.  
(https://groups.google.com/forum/#!topic/reviewboard/7T9oAFHuLSU)

Is there anything we can do here?


Thanks

Rob


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