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But why it tells smpboot: CPU 6 Converting physical 0 to logical die 1? it's very nervous for me.

# cat /proc/cpuinfo

After last upgrade to kernel 5.4 we are found strange bug about the last core of Xeon 5xxx family procs. Kernel marking the last core of last processor as dead: smpboot: CPU 6 Converting physical 0 to logical die 1 We are using Supermicro X8DTU motherboard, BIOS and Intel microcodes was...