The fix for T8691 solved that particular problem, but it helped the upgrade process only two steps ahead. The next bump is:
Applying patch 'phabricator:20150504.symbolsproject.1.php'... [2015-06-27 13:38:13] EXCEPTION: (AphrontSchemaQueryException) #1146: Table 'phabricator_spaces.spaces_namespace' doesn't exist at [<phutil>/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:308] arcanist(head=master, ref.master=29839e8c72c5), phabricator(head=master, ref.master=76e69f0be5c1), phutil(head=master, ref.master=ea6830cc8019) #0 AphrontBaseMySQLDatabaseConnection::throwQueryCodeException(integer, string) called at [<phutil>/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:275] #1 AphrontBaseMySQLDatabaseConnection::throwQueryException(mysqli) called at [<phutil>/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:181] #2 AphrontBaseMySQLDatabaseConnection::executeRawQuery(string) called at [<phutil>/src/xsprintf/queryfx.php:6] #3 queryfx(AphrontMySQLiDatabaseConnection, string, string, string, string, string, string, string, string, string, string) #4 call_user_func_array(string, array) called at [<phutil>/src/xsprintf/queryfx.php:11] #5 queryfx_all(AphrontMySQLiDatabaseConnection, string, string, string, string, string, string, string, string, string, string) called at [<phabricator>/src/infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php:99] #6 PhabricatorCursorPagedPolicyAwareQuery::loadStandardPageRows(PhabricatorSpacesNamespace) called at [<phabricator>/src/infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php:81] #7 PhabricatorCursorPagedPolicyAwareQuery::loadStandardPage(PhabricatorSpacesNamespace) called at [<phabricator>/src/applications/spaces/query/PhabricatorSpacesNamespaceQuery.php:40] #8 PhabricatorPolicyAwareQuery::execute() called at [<phabricator>/src/applications/spaces/query/PhabricatorSpacesNamespaceQuery.php:114] #9 PhabricatorSpacesNamespaceQuery::getAllSpaces() called at [<phabricator>/src/infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php:1769] #10 PhabricatorCursorPagedPolicyAwareQuery::buildSpacesWhereClause(AphrontMySQLiDatabaseConnection) called at [<phabricator>/src/infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php:276] #11 PhabricatorCursorPagedPolicyAwareQuery::buildWhereClauseParts(AphrontMySQLiDatabaseConnection) called at [<phabricator>/src/applications/repository/query/PhabricatorRepositoryQuery.php:425] #12 PhabricatorRepositoryQuery::buildWhereClauseParts(AphrontMySQLiDatabaseConnection) called at [<phabricator>/src/infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php:264] #13 PhabricatorCursorPagedPolicyAwareQuery::buildWhereClause(AphrontMySQLiDatabaseConnection) called at [<phabricator>/src/infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php:95] #14 PhabricatorCursorPagedPolicyAwareQuery::loadStandardPageRows(PhabricatorRepository) called at [<phabricator>/src/applications/repository/query/PhabricatorRepositoryQuery.php:159] #15 PhabricatorRepositoryQuery::loadPage() called at [<phabricator>/src/infrastructure/query/policy/PhabricatorPolicyAwareQuery.php:227] #16 PhabricatorPolicyAwareQuery::execute() called at [<phabricator>/resources/sql/autopatches/20150504.symbolsproject.1.php:21] #17 require_once(string) called at [<phabricator>/src/infrastructure/storage/management/PhabricatorStorageManagementAPI.php:226] #18 PhabricatorStorageManagementAPI::applyPatchPHP(string) called at [<phabricator>/src/infrastructure/storage/management/PhabricatorStorageManagementAPI.php:191] #19 PhabricatorStorageManagementAPI::applyPatch(PhabricatorStoragePatch) called at [<phabricator>/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementUpgradeWorkflow.php:190] #20 PhabricatorStorageManagementUpgradeWorkflow::execute(PhutilArgumentParser) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:406] #21 PhutilArgumentParser::parseWorkflowsFull(array) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:301] #22 PhutilArgumentParser::parseWorkflows(array) called at [<phabricator>/scripts/sql/manage_storage.php:176]
My installation has been running for a while now, but is otherwise plain vanilla (I have made no customizations other than the configuration settings). If you need any additional information please let me know.