CentOS

Problem confirmed by Redhat, and they have rolled back the patch:

http://www.theregister.co.uk/2018/01/18 ... date_woes/

TrevorH wrote:It seems to be done from /lib/udev/rules.d/89-microcode.rules

Aha ! That is useful to know for future reference, thanks.

I don't have such a physical CentOS 6 system readily available so that I could check, but I assume TrevorH is right. When you booted from USB, are you sure you checked the installed system's /etc/rc3.d and not the USB's /etc/rc3.d ? Yes definitely not present on our running Centos 6.9 and 7 systems...

Thanks Trevor. Unfortunately neither the symlink nor the file it is supposed to link to exist on the system. They are also not present on our other unpatched Centos 6.9 machine (sorry I forgot to mention the Centos version before). Also not on a Centos 7 machine we have. In addition, passing dis_uco...

Yesterday I ran a yum update on Centos 6.9 which resulted in an unbootable system. The sequence hangs at microcode: CPU0 sig=0x406f1, pf=0x1, revision=0xb000010 platform microcode: firmware: requesting intel-ucode/06-2f-01 so presumably it's related to microcode changes for the Intel bugs. Unfortuna...