Caught this in the production error logs. We can end up with argv defined and set to an array in an nginx + php-fpm configuration.
When we later run ExecFuture subprocesses, they won't be able to forward the value.
The error this produces looks like this:
015/04/27 12:17:35 [error] 10948#0: *674 FastCGI sent in stderr: "PHP message: [2015-04-27 12:17:35] ERROR 8: Array to string conversion at [/core/lib/libphutil/src/future/exec/ExecFuture.php:667] PHP message: arcanist(head=master, ref.master=805ae12408e8), phabricator(head=master, ref.master=8ce8a761efe9), phutil(head=master, ref.master=fccf03d48e08) PHP message: #0 ExecFuture::isReady() called at [<phutil>/src/future/Future.php:39] PHP message: #1 Future::resolve(NULL) called at [<phutil>/src/future/exec/ExecFuture.php:413] PHP message: #2 ExecFuture::resolvex() called at [<phabricator>/src/applications/diffusion/query/rawdiff/DiffusionGitRawDiffQuery.php:40] PHP message: #3 DiffusionGitRawDiffQuery::executeQuery() called at [<phabricator>/src/applications/diffusion/query/rawdiff/DiffusionRawDiffQuery.php:17] PHP message: #4 DiffusionRawDiffQuery::loadRawDiff() called at [<phabricator>/src/applications/diffusion/conduit/DiffusionRawDiffQueryConduitAPIMethod.php:56] PHP message: #5 DiffusionRawDiffQueryConduitAPIMethod::getResult(ConduitAPIRequest) called at [<phabricator>/src/applications/diffusion/conduit/DiffusionQueryConduitAPIMethod.php:135] PHP message: #6 DiffusionQueryConduitAPIMethod::execute(ConduitAPIRequest) called at [<phabricator>/src/applications/conduit/method/ConduitAPIMethod.php:90] PHP message: #7 ConduitAPIMethod::executeMethod(ConduitAPIRequest) called at [<phabricator>/src/applications/conduit/call/ConduitCall.php:134] PHP message: #8 ConduitCall::executeMethod() called at [<phabricator>/src/applications/conduit/call/ConduitCall.php:84] PHP message: #9 ConduitCall::execute() called at [<phabricator>/src/applications/diffusion/query/DiffusionQuery.php:81] PHP message: #10 DiffusionQuery::callConduitWithDiffusionRequest(PhabricatorUser, DiffusionGitRequest, string, array) called at [<phabricator>/src/applications/diffusion/controller/DiffusionController.php:184] PHP message: #11 DiffusionController::callConduitWithDiffusionRequest(string, array) called at [<phabricat