[Bug 2098777] Re: Intel-microcode 3.20250211.0ubuntu0.20.04.1 causes panic and bootloop on Dell PowerEdge R740xd

[Alex Murray]

Thanks - as I suspected, this microcode was not updated in the most
recent release from what I can see - the list of changed microcodes is
in https://launchpad.net/ubuntu/+source/intel-
microcode/3.20250211.0ubuntu0.20.04.1 and this one is not listed.
Similarly, Intel do not document this in their release notes either -
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-
Files/releases/tag/microcode-20250211

Also I have tested this against a number of machines with this same CPU
and none fail in the same way - so I am not sure how to proceed, other
than to suggest you file a bug upstream with Intel at
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-
Files/issues and see if they can provide any guidance. In this case, can
you please link to your upstream report here so we can track the status
too? Thanks.

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https://bugs.launchpad.net/bugs/2098777

Title:
  Intel-microcode 3.20250211.0ubuntu0.20.04.1 causes panic and bootloop
  on Dell PowerEdge R740xd

Status in intel-microcode package in Ubuntu:
  Incomplete

Bug description:
  After updating intel-microcode from 3.20241112.0ubuntu0.20.04.1 to
  3.20250211.0ubuntu0.20.04.1 in my Ubuntu Server 20.04.6 LTS the server
  is stuck in a bootloop.

  Sometimes I can see an error on console while booting, or sometimes it reboots without completing bootup sequence, and is no more usable.
  For what I have seen on console, it appears to be a kernel panic error coming from "tg3" (broadcom Tigon3 Ethernet driver for NICs).

  Now I succeeded in reverting to version 3.20241112.0ubuntu0.20.04.1 thanks to recovery mode, and server is booting and stable again.
  I put the package on hold to prevent upgrading.

  Server is a Dell PowerEdge R740XD

  Processor: 1x Intel(R) Xeon(R) Gold 6238R CPU @ 2.20GHz
  CPU family:                         6
  Model:                              85
  Model name:                         Intel(R) Xeon(R) Gold 6238R CPU @ 2.20GHz
  Stepping:                           7

  NIC is the integrated, quad-port Broadcom NetXtreme Gigabit Ethernet
  (BCM5720) with firmware 23.11.4

  Ubuntu Version: 20.04.6 LTS
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.27
  Architecture: amd64
  CasperMD5CheckResult: pass
  CloudArchitecture: x86_64
  CloudID: none
  CloudName: none
  CloudPlatform: none
  CloudSubPlatform: config
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2022-04-19 (1036 days ago)
  InstallationMedia: Ubuntu-Server 20.04.4 LTS "Focal Fossa" - Release amd64 (20220223.1)
  Package: intel-microcode 3.20241112.0ubuntu0.20.04.1
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 5.4.0-205.225-generic 5.4.284
  Tags:  focal uec-images
  Uname: Linux 5.4.0-205-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: N/A
  _MarkForUpload: True

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