Description of problem:
Dracut/systemd fails to boot to installed system. When booting with rd.break=pre-pivot, /sysroot is not mounted:

pre-pivot:/# mount
mount 
rootfs on / type rootfs (rw) 
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) 
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime) 
devtmpfs on /dev type devtmpfs (rw,nosuid,size=725980k,nr_inodes=181495,mode=755) 
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) 
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime) 
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev) 
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000) 
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755) 
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,mode=755) 
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd) 
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime) 
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset) 
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu) 
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory) 
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices) 
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) 
cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls) 
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio) 
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event) 
pre-pivot:/# 


pre-pivot:/# systemctl status mount-sysroot
systemctl status mount-sysroot 
mount-sysroot.service 
   Loaded:  [1;31merror [0m (Reason: No such file or directory)
   Active: inactive (dead) 


If rootfs is mounted manually at this point, system boots fine:
pre-pivot:/# mount /dev/mapper/fedora_rtt6-root /sysroot
pre-pivot:/# exit

Whole boot log will be attached.

Version-Release number of selected component (if applicable):
dracut-027-26.git20130415.fc19.s390x
systemd-201-1.fc19.s390x

How reproducible:
always

Steps to Reproduce:
1. install F19 for s390x
2. optionally, update systemd and dracut to latest versions
  
Actual results:
system doesn't boot, rootfs is not mounted

Expected results:
successful boot to installed system