ExaCC CPU-Scale Up Fails With "smpboot: do_boot_cpu failed(-1) to wakeup CPU#"
Applies to:
Linux OS - Version Oracle Linux 6.0 and later
Oracle Cloud Infrastructure
Linux x86-64
Symptoms:
After scale-up on an ExaCC Gen 2 system vCPUs missing on domU side though lscpu shows the right allocated count.
The following error is shown in the console:
[ 51.983296] smpboot: do_boot_cpu failed(-1) to wakeup CPU#6
or in /var/log/messages:
2021-11-04T17:39:54.594039+00:00 <hostname> kernel:info: smpboot: Booting Node 0 Processor 6 APIC 0x6 2021-11-04T17:40:16.753970+00:00 <hostname> kernel:err: smpboot:do_boot_cpu failed(-1) to wakeup CPU#6
Cause:
The CPU is offline:
[root@<hostname> scale]# lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 16 On-line CPU(s) list: 0-5,7,16-23 Off-line CPU(s) list: 6 <<<<<<<<<< Thread(s) per core: 1 Core(s) per socket: 4 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel
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