[Bug 1854881] Re: Boot hang after updating and setting up Iscsi with 4.15.0-72 generic kernel

[Seth Arnold]

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

** No longer affects: intel-microcode (Ubuntu)

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Title:
  Boot hang after updating and setting up Iscsi with  4.15.0-72 generic
  kernel

Status in linux package in Ubuntu:
  New

Bug description:
  Hi All,

  Host Server - Dell PowerEdge R630, Dual Xeon E5-2650 v4, 768GB Memory,
  ESX 6.5.0

  I created a VM with 1vCPU, 2GB Memory, 16GB Hard drive.

  I installed Ubuntu Server 16.04.2 (latest ISO I had on hand),
  installed fine.

  I then ran apt-get update, apt-get upgrade... upgrade failed as repos
  were out of date. I then ran do-distribution-upgrade, ran through
  everything and it appears to work.

  --I don't want to mislead anyone - I can't remember if I rebooted or
  not at this point.

  After this, I setup an Iscsi initiator to an external target, added to
  fstab, formatted and confirmed all working.

  I then rebooted, and... nothing!

  No ping, no ssh or anything... Control + Alt + Del did not work,
  looked like it had frozen. The last line was starting SSH, but the
  previous line was the Iscsi initiator. At this point, I figured
  network is down and ISCSI is hanging as it can't connect/maybe I
  messed up the ISCSI mount.

  I then went to GRUB and did advanced, I did the recovery console for
  kernel 4.15.0-72 generic which lead to a kernel panic:
  https://snipboard.io/YCOZwv.jpg

  I then went through the options again and selected 4.4.0-62 generic,
  and it booted fine, and after about 2 seconds at the recovery menu,
  further ISCSI related text came up: https://snipboard.io/ALZcsF.jpg

  I went to the shell as root, deleted the line from fstab, and
  rebooted, but, it hang again at the same point.

  I then went to advanced, booted normally to 4.4.0-62 generic, and, it
  went through without any issue what so ever.

  Messing around with kernels puts me out of my depth... happy to give
  further info or do more diagnostics if required, however, due to it
  working in a different kernel and nothing out of the ordinary - I
  believe this to be a bug.

  This is on Ubuntu 18.04.3 LTS / Release 18.04

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