> Hello, > Can you please help with an interesting problem. > I have an Intel Haswell based processor with CentOS 7.0 with an early > kernel > booting and running perfectly. > I changed the processor to an Ice Lake and I get the problem below when I > boot the working Haswell disk. > The boot process hangs almost immediately and when I remove the 'quiet' > boot > parameter I see that it hangs randomly, usually with a high CPU number, > when > SMPBOOT is starting up the cores. > The only solution I have found is to boot with the 'nr_cpus=8 (could be > any > low number), update to the latest kernel then reboot with the 'nr_cpus=8' > parameter removed. > On examination there are no problems with CentOS 7.4 and above but there > are > with CentOS 7.3 and below. I think the issue is quite clear here: the newer CPU is not handled correctly by the old kernel - maybe it even doesn't know this CPU type and doesn't know how to detect the number of cores it has. I don't think there is a better solution than what you already did. Regards, Simon