The missing errors are specifically php centric (e.g. PHP Fatal error:
Call to undefined function). Nginx's standard HTTP errors are logged as
normal (such as 404 not found).
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Public bug reported:
Since updating Ubuntu to 12.04, the included php version contains a bug
that causes errors to not be sent upstream to the web server. This error
is a regression from the version supplied with Ubuntu 11.10
(5.3.6-13ubuntu3.7 0).
Using php5-fpm version: 5.3.10-1ubuntu3.1
This