** Changed in: dellserver
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1719697

Title:
  Boot/Installation crash of Ubuntu-16.04.3 HWE kernel on R940

Status in dellserver:
  Fix Released
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Zesty:
  Fix Released

Bug description:

  == SRU Justification ==
  Kernel crashes when installation of Ubuntu-16.04.3 with HWE (ISO).
  Same observation while booting to 4.10.0-28 HWE kerenl of Ubuntu-16.04.3
  and 4.10.0-33 HWE as well.

  Seen only with 4.10 HWE kernels of Ubuntu-16.04.3.  4.4 kernels of
  Ubuntu-16.04.3 works fine. Daily builds of Ubuntu Server 17.10 works fine.

  Reducing the core count to <26 cores helps here. Boot & installation of
  HWE-kernel works fine.

  This bug was introduced by commit:
  dc6db24d2476 ("x86/acpi: Set persistent cpuid <-> nodeid mapping when 
booting")

  It is resolved by reverting commit dc6db24d2476, which was done in mainline 
by 
  commit c962cff17df as of v4.11-rc3.

  There are three additiona commits introduced by the same patch author when
  commit c962cff17df was submitted.  However, it was confirmed that only the 
single
  revert is needed to fix this particular bug.  Upstream thread:
   https://lkml.org/lkml/2017/2/20/66

  == Fix ==
  commit c962cff17dfa11f4a8227ac16de2b28aea3312e4
  Author: Dou Liyang <douly.f...@cn.fujitsu.com>
  Date:   Fri Mar 3 16:02:23 2017 +0800

      Revert "x86/acpi: Set persistent cpuid <-> nodeid mapping when
  booting"

  == Regression Potential ==
  This is reverting a commit that introduced a bug.  This commit has also
  been reverted upstream.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.




  Setup:
  Dell PowerEdge R940 having 2 socket populated with 28 cores.

  Impact:
  This is a boot and installation failure for R940 users having 2 socket x 28 
cores.
  Requesting an SRU for the fix.

  Steps:
  1. Setup a Dell PowerEdge R940 with 28 cores CPUs on 2 sockets.
  2. Start installation of Ubuntu-16.04.3 with HWE kernel.
  3. Observe the screen remains blank. Console logs indicate kernel crash.

  Additional Info:
  * Seen only with 4.10 HWE kernels of Ubuntu-16.04.3.
    4.4 kernels of Ubuntu-16.04.3 works fine. Daily builds of Ubuntu Server 
17.10 works fine.

  * Reducing the core count to <26 cores helps here. Boot & installation
  of HWE-kernel works fine.

  * Attaching the console log and acpidump from the setup.

  * Patch causing this failure: 
https://github.com/torvalds/linux/commit/dc6db24d2476cd09c0ecf2b8d80313539f737a89
  x86/acpi: Set persistent cpuid <-> nodeid mapping when booting

  * Fix patch series: https://lkml.org/lkml/2017/2/20/66

  Revert "x86/acpi: Set persistent cpuid <-> nodeid mapping when booting"
  
https://github.com/torvalds/linux/commit/c962cff17dfa11f4a8227ac16de2b28aea3312e4#diff-6bd7ef719bca1a2a56b9ebf4bd0bd88d

  Revert"x86/acpi: Enable MADT APIs to return disabled apicids"
  
https://github.com/torvalds/linux/commit/09c3f2bd5c7e5f18687663acb6adc6b167484ca5

  acpi/processor: Implement DEVICE operator for processor enumeration
  
https://github.com/torvalds/linux/commit/8c8cb30f49b86333d8e036e1945cf1a78c03577e

  acpi/processor: Check for duplicate processor ids at hotplug time
  
https://github.com/torvalds/linux/commit/a77d6cd968497792e072b74dff45b891ba778ddb

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