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

[Alex Murray]

Thanks for reporting this issue - apologies for the inconvenience - I am
a bit confused though since from what I can see the microcode for this
processor was not updated as part of this latest update - can you please
run

apport-collect 2098777

from the affected machine - which should attach additional information
about the machine here.

Otherwise, can you provide the output of the following commands on the
affected system:

lscpu
iucode-tool -S
journalctl -k --grep microcode


Thanks.

** Changed in: intel-microcode (Ubuntu)
       Status: New => Incomplete

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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

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