Public bug reported:

== Comment: #0 - Balamuruhan S <balamuruh...@in.ibm.com> - 2018-03-29 01:36:52 
==
---Problem Description---
Guest fails to boot with Call Trace by using "console=ttyS0,115200" in kernel 
param

Using latest kernel suggested by Bug 166023 in Host and Guest
 
Contact Information = Balamuruhan S / balamuruh...@in.ibm.com 
 
---uname output---
# uname -a Linux ltc-boston17 4.15.0-12-generic #13 SMP Tue Mar 27 08:20:19 CDT 
2018 ppc64le ppc64le ppc64le GNU/Linux
 
Machine Type = Boston 
 
---Debugger---
A debugger is not configured
 
---Steps to Reproduce---
1. Have a healthy guest booted with latest kernel
2. Boot the guest and enter grub menu to edit kernel param
2. append "console=ttyS0,115200" to kernel param and try to boot
3. Guest fails to boot and goes to shutoff state with Call Trace
 
Call Trace:
[    9.184631] random: crng init done
[    9.330927] Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x00000100
[    9.330927] 
[    9.332928] CPU: 25 PID: 1 Comm: init Not tainted 4.15.0-12-generic #13
 [    9.334375] Call Trace:
[    9.335077] [c0000007fd10bc30] [c000000000ce991c] dump_stack+0xb0/0xf4 
(unreliable)
[    9.336334] [c0000007fd10bc70] [c00000000010b4a0] panic+0x148/0x328
[    9.337339] [c0000007fd10bd10] [c000000000112888] do_exit+0xc78/0xc80
[    9.338359] [c0000007fd10bdd0] [c000000000112960] do_group_exit+0x60/0x100
[    9.339216] [c0000007fd10be10] [c000000000112a24] SyS_exit_group+0x24/0x30
[    9.340113] [c0000007fd10be30] [c00000000000b184] system_call+0x58/0x6c

Oops output:
 no
 
System Dump Info:
  The system is not configured to capture a system dump.
 
*Additional Instructions for Balamuruhan S / balamuruh...@in.ibm.com: 
-Post a private note with access information to the machine that the bug is 
occuring on. 
-Attach sysctl -a output output to the bug.

== Comment: #7 - Balamuruhan S <balamuruh...@in.ibm.com> - 2018-04-13
04:28:22 ==


I have hit it while booting already installed guest from qcow2 and edited its 
commandline from grub menu, so I have attached the full boot log.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-166200 severity-high 
targetmilestone-inin---

** Tags added: architecture-ppc64le bugnameltc-166200 severity-high
targetmilestone-inin---

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https://bugs.launchpad.net/bugs/1764377

Title:
  [Ubuntu 18.04] Guest fails to boot with "console=ttyS0,115200"
  included in kernel param

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