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

[bugproxy]

== Comment: #0 - Balamuruhan S <email address hidden> - 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 / <email address hidden>

---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 / <email address hidden>:
-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 <email address hidden> - 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.

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Default Comment by Bridge

[Frank Heimes (fheimes)]

Since we are still in development with bionic and things change quickly, please re-try with the very latest kernel which is right now:

$ sudo apt -y -qq update && rmadison --arch=ppc64el linux-generic | grep bionic
 linux-generic | 4.15.0.15.16 | bionic | ppc64el

[Manoj Iyer (manjo)]

This bug was reported using a very old bionic kernel, closing this bug as invalid, if this is still a valid bug please re-open.