Boot stops and hangs after Update (SLE12 SP1)

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Environment

SUSE Linux Enterprise Server 12 Service Pack 1 (SLES 12 SP1)

Situation

After an update from Kernel 3.12.67-60.64.24 the system does not start up anymore but hangs after loading kernel and initrd. Debug shows an error at

Mounting /sysroot
[FAILED] Failed to mount /sysroot

in the grub commandline there is an entry like

root=UUID=

for the root device.

Resolution

To boot into the system again replace

    root=UUID=

with

   root=/dev/mapper/insert_here_the_SCSIID_and_if_necessary_partNO_of_root_device

within the grub shell and boot into the system. After booting into the system

adjust the entry for the root Filesystem in

   /etc/fstab

accordingly and set in

/etc/default/grub

   GRUB_DISABLE_LINUX_UUID=true

and then activate the new bootloader settings with

    grub2-mkconfig -o /boot/grub/grub.cfg

the system will boot properly again.

Cause

Disclaimer

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