Cross-filed ticket 01903060 on the Red Hat customer portal.

I assume that the AVC in comment#0 talks about /proc/sys/net directory.

There is a lot of files and directories under /proc/sys/net, all of them are labeled sysctl_net_t except for:

# ls -Z /proc/sys/net/unix
-rw-r--r--. root root system_u:object_r:sysctl_net_unix_t:s0 max_dgram_qlen
#

$ sealert -l f56525a2-36a4-48ef-a9d8-61adbc0f3e1d
[…]
Source Context                system_u:system_r:keepalived_t:s0
Target Context                system_u:object_r:sysctl_net_t:s0
Target Objects                net [ dir ]
Source                        keepalived
Source Path                   /usr/sbin/keepalived
[…]
Policy RPM                    selinux-policy-3.13.1-166.el7.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
[…]

Raw Audit Messages
type=AVC msg=audit(1502994621.228:112561): avc:  denied  { search } for  pid=2198 comm="keepalived" name="net" dev="proc" ino=9716 scontext=system_u:system_r:keepalived_t:s0 tcontext=system_u:object_r:sysctl_net_t:s0 tclass=dir
[…]
$

$ find /proc/ -inum 9716
/proc/sys/net
$ 

So the issue seems to be that keepalived is not allowed to search in the
/proc/sys/net directory in general?

comment#0 mentions that keepalived triggers SELinux denials which are related to /proc and sysctl_net_t. Here is the /proc related one:
----
type=PROCTITLE msg=audit(01/30/2018 10:55:44.274:633) : proctitle=/usr/sbin/keepalived -D --snmp 
type=SYSCALL msg=audit(01/30/2018 10:55:44.274:633) : arch=x86_64 syscall=statfs success=no exit=EACCES(Permission denied) a0=0x5566d189c854 a1=0x7ffc459bb9f0 a2=0x8000 a3=0x46 items=0 ppid=11234 pid=11236 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=keepalived exe=/usr/sbin/keepalived subj=system_u:system_r:keepalived_t:s0 key=(null) 
type=AVC msg=audit(01/30/2018 10:55:44.274:633) : avc:  denied  { getattr } for  pid=11236 comm=keepalived name=/ dev="proc" ino=1 scontext=system_u:system_r:keepalived_t:s0 tcontext=system_u:object_r:proc_t:s0 tclass=filesystem 
----

The AVC is reproducible even if the latest selinux-policy build is installed.

# rpm -qa selinux\* keepalived\* | sort
keepalived-1.3.5-5.el7.x86_64
selinux-policy-3.13.1-186.el7.noarch
selinux-policy-devel-3.13.1-186.el7.noarch
selinux-policy-targeted-3.13.1-186.el7.noarch
#

Based on SELinux denials from comment#0 and comment#4, keepalived wants to search something under /proc/sys/net. Even if keepalived found the right file, it would not be able to read it, because the policy does not allow keepalived to read any files under /proc/sys/net. Therefore I believe that following rule should be also added to the policy:

allow keepalived_t sysctl_net_t : file { getattr open read } ;

The same SELinux denial as mentioned in comment#8 appeared again:
----
type=PROCTITLE msg=audit(02/06/2018 09:04:22.470:361) : proctitle=/usr/sbin/keepalived -D --snmp 
type=SYSCALL msg=audit(02/06/2018 09:04:22.470:361) : arch=x86_64 syscall=statfs success=no exit=EACCES(Permission denied) a0=0x558e1d0c6854 a1=0x7fff30aec800 a2=0x8000 a3=0x46 items=0 ppid=20591 pid=20593 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=keepalived exe=/usr/sbin/keepalived subj=system_u:system_r:keepalived_t:s0 key=(null) 
type=AVC msg=audit(02/06/2018 09:04:22.470:361) : avc:  denied  { getattr } for  pid=20593 comm=keepalived name=/ dev="proc" ino=1 scontext=system_u:system_r:keepalived_t:s0 tcontext=system_u:object_r:proc_t:s0 tclass=filesystem permissive=0 
----

# rpm -qa selinux\*
selinux-policy-targeted-3.13.1-187.el7.noarch
selinux-policy-3.13.1-187.el7.noarch
selinux-policy-devel-3.13.1-187.el7.noarch
#

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://access.redhat.com/errata/RHBA-2018:0763