Ubuntu doesn't boot anymore {REGRESSION}

[Tommy_CZ]

After I upgraded to latest kernel, Ubuntu does not boot without messing with grub (I had to delete quiet splash options).
Before upgrade it was OK.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-42-generic 4.4.0-42.62
ProcVersionSignature: Ubuntu 4.4.0-42.62-generic 4.4.21
Uname: Linux 4.4.0-42-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: tomas 2090 F.... pulseaudio
 /dev/snd/controlC1: tomas 2090 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Oct 14 11:32:56 2016
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=2ff267c2-ec30-4f81-975c-46640f436942
InstallationDate: Installed on 2016-09-13 (30 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: LENOVO 10104
ProcEnviron:
 LANGUAGE=cs_CZ
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=cs_CZ.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.4.0-42-generic root=UUID=fd50bb86-da1a-45bb-957b-ea19b330d7ff ro rootflags=subvol=@ vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-42-generic N/A
 linux-backports-modules-4.4.0-42-generic N/A
 linux-firmware 1.157.3
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/21/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: ELKT31AUS
dmi.board.name: MAHOBAY
dmi.board.vendor: LENOVO
dmi.board.version: 31900003 STD
dmi.chassis.type: 13
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnLENOVO:bvrELKT31AUS:bd03/21/2013:svnLENOVO:pn10104:pvrLenovoC440:rvnLENOVO:rnMAHOBAY:rvr31900003STD:cvnToBeFilledByO.E.M.:ct13:cvrToBeFilledByO.E.M.:
dmi.product.name: 10104
dmi.product.version: Lenovo C440
dmi.sys.vendor: LENOVO

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

I'd like to perform a bisect to identify the commit that introduced this regression. Can you test the following kernels and see which ones exhibit the bug:

4.4.19: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.19/
4.4.20: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.20/
4.4.21: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.21

You don't have to test all of them, just up until the first one shows the bug.

Also, does this issue only happen with the -42 kernel? Do you know if it happens with the -39 kernel? Do you know the last kernel version that did not have the bug?

Thanks in advance!

[Joseph Salisbury (jsalisbury)]

This could be related to bug 1632902. Can you also see if the -36 kernel boots, but not -38?

[Tommy_CZ (t-kijas)]

The situation is crazy.
I have -43, -42, -38 and -36 kernels.

The bug is not in "quiet splash" option.

All of them can boot only 1 of 8 times, no matter which one, no matter whether "quiet splash" is present or not.

It is probably not bug in kernel.

[Joseph Salisbury (jsalisbury)]

Do any prior kernels boot, that would tell us if it is a kernel bug or not. Maybe try a Trusty kernel:

https://launchpad.net/~canonical-kernel-security-team/+archive/ubuntu/ppa/+build/11004661

Or maybe even the mainline kernel:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9-rc1/

[Tommy_CZ (t-kijas)]

Latest kernel (4.8.2 I think) can boot IF I go to grub settings (to choose that kernel).
Without it even that kernel ends in that panic error.

[Joseph Salisbury (jsalisbury)]

Are you saying the panic only happens if you have the "quiet splash" options enabled? Regardless of the kernel version?

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu Xenial) because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]