May be transverse: https://bugzilla.redhat.com/show_bug.cgi?id=700559

SELinux is preventing /bin/systemd-tty-ask-password-agent from using the 'signull' accesses on a process.

*****  Plugin catchall (100. confidence) suggests  ***************************

If you believe that systemd-tty-ask-password-agent should be allowed signull access on processes labeled lvm_t by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep systemd-tty-ask /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                unconfined_u:system_r:systemd_passwd_agent_t:s0
Target Context                system_u:system_r:lvm_t:s0
Target Objects                Unknown [ process ]
Source                        systemd-tty-ask
Source Path                   /bin/systemd-tty-ask-password-agent
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           systemd-25-1.fc15
Target RPM Packages           
Policy RPM                    selinux-policy-3.9.16-16.fc15
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux localhost 2.6.38.3-18.fc15.x86_64 #1 SMP Fri
                              Apr 22 13:24:23 UTC 2011 x86_64 x86_64
Alert Count                   2
First Seen                    Thu 28 Apr 2011 08:31:34 PM MSD
Last Seen                     Thu 28 Apr 2011 08:41:57 PM MSD
Local ID                      cc044d1b-1ce3-42e3-9aab-d7f56ea4b940

Raw Audit Messages
type=AVC msg=audit(1304008917.897:1600): avc:  denied  { signull } for  pid=32297 comm="systemd-tty-ask" scontext=unconfined_u:system_r:systemd_passwd_agent_t:s0 tcontext=system_u:system_r:lvm_t:s0 tclass=process


type=SYSCALL msg=audit(1304008917.897:1600): arch=x86_64 syscall=kill success=yes exit=0 a0=7e02 a1=0 a2=4ff1a a3=3130313065633464 items=0 ppid=32296 pid=32297 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=1 comm=systemd-tty-ask exe=/bin/systemd-tty-ask-password-agent subj=unconfined_u:system_r:systemd_passwd_agent_t:s0 key=(null)

Hash: systemd-tty-ask,systemd_passwd_agent_t,lvm_t,process,signull

audit2allow

#============= systemd_passwd_agent_t ==============
allow systemd_passwd_agent_t lvm_t:process signull;

audit2allow -R

#============= systemd_passwd_agent_t ==============
allow systemd_passwd_agent_t lvm_t:process signull;