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.