My SUSE leap 42.3 system failed to boot after downloading latest kernal patch several days ago. I have my old SUSE 42.1 on a separate disk on the same computer. It booted OK and I can read the entire 42.3 system...same passwords! The 42.3 screen failure message is:

some messages followed by...
kernal_init
ret-from_fork
DWARF2 unwinder stuck at rtn_from_fork
Leftover inexact backtrace:
Kernal offset: disabled
{end kernal panic
not syncing: VPS:
unable to mount root FS on unknown block (0,0)

Since I have complete access to the failed system I presume I can fix it....IF I ONLY KNEW WHAT TO FIX.

Anybody have any ideas?

openSUSE bootloader menus keep at least one prior kernel option. Do you get the same failure choosing one? What if you choose a failsafe option? Which kernel version is failing?

Once booted to another kernel or with failsafe, you should be able to remove and reinstall the failing kernel, or rebuild its initrd, and capture the journal to look for more clues about what might have gone wrong installing the newest kernel or building its initrd.

Some specifications from your PC might help us help you. Try(which you might need to install first. From 42.1 would be fine, run from an Xorg session if possible.)

Thanks for the prior kernal option information. The prior kernal loads properly. Will research the way to replace the failed kernal.