Okay Here is what i did ! i removed 5.6 installed 5.5 ; i thought there might be difference but again still the same problem ; here is the content of /etc/yum.repos.d/ after yum clean all ...

CentOS mit neuen Funktionen und Erweiterungen In der Versionsankündigung schreiben die Entwickler, dass der Kernel in aktueller Version 6.12 dabei ist.

Greg Kurtzer, one of the co-founders of the CentOS Linux distribution, the creator of the Singularity container environment for HPC workloads, the founder of the new Rocky Linux distribution that ...