As bionic already ships a v4.15 kernel, this should be fixed in bionic.

Can you verify?

Cascardo.

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Bionic)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1747134

Title:
  [bug] [BDX]Ubuntu 16.04.3  with kernel
  "4.10.0-32-generic_4.10.0-32.36~16.04.1_amd64"  hang if set "Cores
  Enabled" to 2 for both CPU

Status in intel:
  New
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  New
Status in linux source package in Artful:
  Triaged
Status in linux source package in Bionic:
  Fix Released

Bug description:
  Description:
  Customer report a Ubuntu kernel issue related to Intel BDX Core numbers 
setting
  Ubuntu 16.04.3  with kernel "4.10.0-32-generic_4.10.0-32.36~16.04.1_amd64"  
hang if set "Cores Enabled" to 2 for both CPU.

  We have reproduced this issue on 17.10 release.

  With latest kernel, this issue disappears.

  now we bisect this issue is fixed by commit 947134d9b00f
  (“x86/smpboot: Do not use smp_num_siblings in __max_logical_packages
  calculation”) which was merged in v4.15-rc4.

  But after applying this commit to Ubuntu 16.04.3 kernel v4.13 code
  base or Linux upstream mainline kernel v4.13 code base, this issue
  still exists.

  Target Release: 16.04 / 17.10

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