https://rhn.redhat.com/errata/RHBA-2015-0048.html http://bugs.centos.org/view.php?id=8083 Hi All, I would like to check if you are also able to see this issue. After nss-softokn-freebl upgraded to 3.14.3-19, it doesnt provide file: /usr/lib64/libfreebl3.chk If we try to install/reinstall kernel, or try mkinitrd. it will fail. I can reproduce this problem on EL 6.6, I think it should be a serious problem... since later yum update kernel will report success(tiny warning), but os reboot will crash. -- Regards, -suse