Description of problem:
When running:
  systemctl enable messagebus.service
I got this message:
  Failed to execute operation: No such file or directory
I am able to enable/disable all other services but this on.
It is enabled by default, so it is not really problem for me. It is just weird.

Version-Release number of selected component (if applicable):
# rpm -qf /bin/systemctl /usr/lib/systemd/system/messagebus.service
systemd-216-14.fc21.x86_64
dbus-1.8.14-1.fc21.x86_64

How reproducible:
always
I was able to reproduce this on RHEL7 too.

Steps to Reproduce:
1. systemctl enable messagebus.service

Actual results:
  Failed to execute operation: No such file or directory

Expected results:
  no errors

Additional info:
Tail of strace:
access("/etc/systemd/system/messagebus.service", F_OK) = -1 ENOENT (No such file or directory)
access("/run/systemd/system/messagebus.service", F_OK) = -1 ENOENT (No such file or directory)
access("/usr/local/lib/systemd/system/messagebus.service", F_OK) = -1 ENOENT (No such file or directory)
access("/usr/lib/systemd/system/messagebus.service", F_OK) = 0
stat("/proc/1/root", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
stat("/", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
lstat("/run/systemd/system/", {st_mode=S_IFDIR|0755, st_size=140, ...}) = 0
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"OK f97d44f4b5fb434f9dbab13f57730"..., 256}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS{pid=1, uid=0, gid=0}}, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 52
sendmsg(3, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\4\1$\0\0\0\1\0\0\0\242\0\0\0\1\1o\0\31\0\0\0/org/fre"..., 184}, {"\27\0\0\0\22\0\0\0messagebus.service\0\0\0\0\0\0"..., 36}], msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 220
recvmsg(3, 0x7fff2e0d48e0, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
ppoll([{fd=3, events=POLLIN}], 1, {24, 999970000}, NULL, 8) = 1 ([{fd=3, revents=POLLIN}], left {24, 999480933})
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"l\3\1\1\36\0\0\0\1\0\0\0?\0\0\0\5\1u\0\1\0\0\0", 24}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS{pid=1, uid=0, gid=0}}, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 24
recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\4\1s\0'\0\0\0org.freedesktop.DBus.Err"..., 86}], msg_controllen=32, {cmsg_len=28, cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS{pid=1, uid=0, gid=0}}, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) = 86
writev(2, [{"Failed to execute operation: No "..., 54}, {"\n", 1}], 2Failed to execute operation: No such file or directory
) = 55
close(3)                                = 0
exit_group(1)                           = ?
+++ exited with 1 +++


Selinux is disabled (not sure if this matters).