We recently had infrastructure issues which caused the internal PHP function session_regenerate_id() to fail, and this was reported (incorrectly, I think) as a coding_exception().

This appears to be caused by MDL-23884's changes to the default_error_handler() function, which treat any E_RECOVERABLE_ERROR as a coding_exception().

Is this expected behaviour (i.e. should the Moodle session manager code be expected to anticipate and handle this obscure error)? If not, could it maybe be changed to moodle_exception()?