What's wrong with Linux Kernel 5.12.5?

Question

linux

Fedora 34 installed a new kernel version 5.12.5 and as a result the system started to drop dead, I had to roll back to the previous kernel! What to do?

Answer 1

Fedora 34 couldn't install kernel 5.12.5 on its own because 5.11.21 is the last thing Fedora 34 has in official updates:
[[email protected] ~]$ sudo dnf update
Last metadata expiration check: 2:47:11 ago on Sun 23 May 2021 07:50:11 AM BST.
Dependencies resolved.
nothing to do.
Complete!
[[email protected] ~]$ uname -r
5.11.21-300.fc34.x86_64
[[email protected] ~]$ cat /etc/redhat-release
Fedora release 34 (Thirty Four)
[[email protected] ~]$
So with installing kernel 5.12.5 obviously "playful little hands" [re]tried.
ADDED: although Fedora 34 could install kernel 5 by itself. 12.5 But only if the testing repository has been enabled . For stable version 5.11.21 latest. Well, if you allowed yourself testing , then Evil Pinocchio to Yourself.