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Build Identifier: 

updating tumbleweed with zypper dup to TW 2018-06-26 results in systems which successfully loads grub. However, starting the OS fails because it cannot find root device. The path to the root device and root device name are correct, however, the following error is displayed before the startup process tries to access to the root device:

"device-mapper: table 254:0 multipath: error getting device"

Not sure why device mapper is involved to begin with as I don't use a device mapper setup. 

Reproducible: Always

Steps to Reproduce:
1. zypper dup --no-allow-vendor-change
2. reboot
3. select the default kernel image
Actual Results:  
after selecting the new TW version, a short notice is displayed stating 
"device-mapper: table 254:0 multipath: error getting device" followed by an animated boot screen. Hitting the ESC key displays: 
a start job is running for device ..... (with device id of the root device)

The start job never finishes. The system can be rebooted with Sys-Req S,U,B

Expected Results:  
Normal startup

The current system runs kernel 4.16.0-1-default, with the following disk layout:

UUID=7f67d2ea-51cc-4e6c-9e82-2e17c47edc86  swap                     swap   defaults                        0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /                        btrfs  defaults                        0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /boot/grub2/i386-pc      btrfs  subvol=@/boot/grub2/i386-pc     0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /boot/grub2/x86_64-efi   btrfs  subvol=@/boot/grub2/x86_64-efi  0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /opt                     btrfs  subvol=@/opt                    0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /srv                     btrfs  subvol=@/srv                    0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /tmp                     btrfs  subvol=@/tmp                    0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /usr/local               btrfs  subvol=@/usr/local              0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/cache               btrfs  subvol=@/var/cache              0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/crash               btrfs  subvol=@/var/crash              0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/lib/libvirt/images  btrfs  subvol=@/var/lib/libvirt/images  0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/lib/machines        btrfs  subvol=@/var/lib/machines       0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/lib/mailman         btrfs  subvol=@/var/lib/mailman        0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/lib/mariadb         btrfs  subvol=@/var/lib/mariadb        0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/lib/mysql           btrfs  subvol=@/var/lib/mysql          0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/lib/named           btrfs  subvol=@/var/lib/named          0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/lib/pgsql           btrfs  subvol=@/var/lib/pgsql          0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/log                 btrfs  subvol=@/var/log                0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/opt                 btrfs  subvol=@/var/opt                0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/spool               btrfs  subvol=@/var/spool              0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /var/tmp                 btrfs  subvol=@/var/tmp                0  0
UUID=d5d82692-28ad-43d3-860c-22b4991a15cc  /.snapshots              btrfs  subvol=@/.snapshots             0  0
UUID=CE1E-17A4                             /boot/efi                vfat   umask=0002,utf8=true            0  0
UUID=4e9fb774-a924-4399-9539-43c17563a138  /home                    btrfs  defaults                        0  0