I'm seeing the following error appearing a fair bit in our PHP logs:
```
[11-Jun-2014 04:16:45 UTC] [2014-06-11 14:16:45] ERROR 2: apc_store(): Potential cache slam averted for key 'phabricator.setup.issues' at [/usr/src/libphutil/src/cache/PhutilKeyValueCacheAPC.php:38]
[11-Jun-2014 04:16:45 UTC] #0 apc_store(phabricator.setup.issues, 0, 0) called at [/usr/src/libphutil/src/cache/PhutilKeyValueCacheAPC.php:38]
[11-Jun-2014 04:16:45 UTC] #1 PhutilKeyValueCacheAPC::setKeys(Array { phabricator.setup.issues => 0 }, null) called at [/usr/src/libphutil/src/cache/PhutilKeyValueCacheProxy.php:27]
[11-Jun-2014 04:16:45 UTC] #2 PhutilKeyValueCacheProxy::setKeys(Array { phabricator.setup.issues => 0 }, null) called at [/usr/src/libphutil/src/cache/PhutilKeyValueCacheProfiler.php:78]
[11-Jun-2014 04:16:45 UTC] #3 PhutilKeyValueCacheProfiler::setKeys(Array { phabricator.setup.issues => 0 }, null) called at [/usr/src/libphutil/src/cache/PhutilKeyValueCacheStack.php:114]
[11-Jun-2014 04:16:45 UTC] #4 PhutilKeyValueCacheStack::setKeys(Array { phabricator.setup.issues => 0 }, null) called at [/usr/src/libphutil/src/cache/PhutilKeyValueCache.php:60]
[11-Jun-2014 04:16:45 UTC] #5 PhutilKeyValueCache::setKey(phabricator.setup.issues, 0) called at [/usr/src/phabricator/src/applications/config/check/PhabricatorSetupCheck.php:37]
[11-Jun-2014 04:16:45 UTC] #6 PhabricatorSetupCheck::setOpenSetupIssueCount(0) called at [/usr/src/phabricator/src/applications/config/check/PhabricatorSetupCheck.php:82]
[11-Jun-2014 04:16:45 UTC] #7 PhabricatorSetupCheck::willProcessRequest() called at [/usr/src/phabricator/webroot/index.php:38]
```