lscpu not showing number of sockets on arm64

Bug #1957126 reported by William Wilson
This bug affects 1 person
Affects Status Importance Assigned to Milestone
util-linux (Ubuntu)

Bug Description

When running `lscpu` on arm64, the number of sockets is not populated. This is seen on both Raspberry Pi hardware and in the autopkgtest environment. Example output:

Architecture: aarch64
  CPU op-mode(s): 32-bit, 64-bit
  Byte Order: Little Endian
CPU(s): 4
  On-line CPU(s) list: 0-3
Vendor ID: ARM
  Model name: Cortex-A72
    Model: 3
    Thread(s) per core: 1
    Core(s) per cluster: 4
    Socket(s): -
    Cluster(s): 1
    Stepping: r0p3
    CPU max MHz: 1500.0000
    CPU min MHz: 600.0000
    BogoMIPS: 108.00
    Flags: fp asimd evtstrm crc32 cpuid
  Itlb multihit: Not affected
  L1tf: Not affected
  Mds: Not affected
  Meltdown: Not affected
  Spec store bypass: Vulnerable
  Spectre v1: Mitigation; __user pointer sanitization
  Spectre v2: Vulnerable
  Srbds: Not affected
  Tsx async abort: Not affected

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