this is what passenger try to do:

rm -rf /var/run/rh-passenger40/passenger.1.0.16997/generation-0
rm -rf /var/run/rh-passenger40/passenger.1.0.16997

According to my tests, this is the minimal SELinux policy module needed by passenger to work in RHEL7 without AVCs:

module test 1.0;

require {
        type fs_t;
        type passenger_t;
        type httpd_t;
        class unix_stream_socket { read write getattr };
        class process getsession;
        class capability2 block_suspend;
        class tcp_socket accept;
        class filesystem getattr;
}

allow passenger_t self:capability2 block_suspend;
allow passenger_t self:process getsession;
allow passenger_t fs_t:filesystem getattr;
allow passenger_t self:tcp_socket accept;
allow passenger_t httpd_t:unix_stream_socket { getattr read write };

(In reply to Jan Kaluža from comment #2)
> According to my tests, this is the minimal SELinux policy module needed by
> passenger to work in RHEL7 without AVCs:
> 
> module test 1.0;
> 
> require {
>         type fs_t;
>         type passenger_t;
>         type httpd_t;
>         class unix_stream_socket { read write getattr };
>         class process getsession;
>         class capability2 block_suspend;
>         class tcp_socket accept;
>         class filesystem getattr;
> }
> 
> allow passenger_t self:capability2 block_suspend;
> allow passenger_t self:process getsession;
> allow passenger_t fs_t:filesystem getattr;
> allow passenger_t self:tcp_socket accept;
> allow passenger_t httpd_t:unix_stream_socket { getattr read write };

My test pass with this module and Enforcing mode. Test is about running passenger with mod_passenger and 3 ruby collection (ruby193,ruby200,rh-ruby22) as interpret.

commit 972c57ac37720defc8b6bd7e100ce9dcb4bb9309
Author: Lukas Vrabec <lvrabec>
Date:   Tue Sep 1 18:01:36 2015 +0200

    Allow passenger to getattr filesystem xattr
    Resolves: #1196555

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2300.html