Comment # 1 on bug 1187726 from Takashi Iwai

(In reply to Giacomo Comes from comment #0)
> I'm testing the latest kernel stable from Kernel:/stable:/Backport on leap
> 15.3.
> However when I try to install packages from Kernel:/stable:/KMP I found the
> following problems:
> 
> 1) installing virtualbox-kmp-default gives the following error:
> 
> Problem: nothing provides 'kernel-uname-r = 5.12.13-1.g2ab6e2b-default'
> needed by the to be installed
> virtualbox-kmp-default-6.1.22_k5.12.13_1.g2ab6e2b-4.34.x86_64
>  Solution 1: do not install
> virtualbox-kmp-default-6.1.22_k5.12.13_1.g2ab6e2b-4.34.x86_64
>  Solution 2: break
> virtualbox-kmp-default-6.1.22_k5.12.13_1.g2ab6e2b-4.34.x86_64 by ignoring
> some of its dependencies
> 
> It seems like the kmp modules have version 5.12.13-1 but the kernel has
> version 5.12.13 then the error.
> The same issue apply to the others kmp rpms.

The KMPs might become incompatible due to the different tools.
We may need yet another OBS projects for KMP on Kernel:stable:Backport?  Adding
Michal to Cc.

> 2) installing virtualbox gives the following error:
> 
> Problem: nothing provides 'libc.so.6(GLIBC_2.33)(64bit)' needed by the to be
> installed virtualbox-6.1.22-4.38.x86_64
>  Solution 1: do not install virtualbox-6.1.22-4.38.x86_64
>  Solution 2: break virtualbox-6.1.22-4.38.x86_64 by ignoring some of its
> dependencies

This is because you've tried to install a package for TW.  That won't work.
You must install a package from its devel project built for openSUSE Leap
instead.