Steps to reproduce
Pull phabricator, arcanist and libphutil from the wmf hosted repo's, check out wmf/stable.
Then you will get errors.
[Sun Dec 11 12:12:09.274098 2016] [:error] [pid 1422] [client 10.68.21.68:37080] >>> UNRECOVERABLE FATAL ERROR <<<\n\nCall to undefined method PhabricatorEnv::getRemoteAddress()\n\n/srv/phab/phabricator/src/applications/people/storage/PhabricatorUserLog.php:111\n\n\n\xe2\x94\xbb\xe2\x94\x81\xe2\x94\xbb \xef\xb8\xb5 \xc2\xaf\\_(\xe3\x83\x84)_/\xc2\xaf \xef\xb8\xb5 \xe2\x94\xbb\xe2\x94\x81\xe2\x94\xbb
^^ that is related to the update they are doing for supporting ipv6 I think.
Caused by https://github.com/wikimedia/phabricator/commit/6058d3305f82cec7e0d149e4d93d26706a9617e5