[Bug 1705345] Re: Installing new kernel hangs on plymouth --ping

[David Wahler]

I hit this bug while trying to install a kernel upgrade (going from the
default 4.13.0-16-generic to 4.13.8-041308, from the mainline PPA). I
managed to get an strace from running "plymouth --ping". In the attached
trace file, the hang happened on the last call to epoll_pwait.

I also tried attaching strace to plymouthd, but when I did that, it
caused plymouthd to immediately exit (which in turn caused plymouth
--ping to return). After that, subsequent runs of "plymouth --ping"
returned immediately (getting ECONNREFUSED on the
"/org/freedesktop/plymouthd" socket), and I haven't been able to
reproduce the bug since.

** Attachment added: "plymouth.strace"
   https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1705345/+attachment/4975330/+files/plymouth.strace

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Title:
  Installing new kernel hangs on plymouth --ping

Status in plymouth package in Ubuntu:
  Incomplete

Bug description:
  I tried to upgrade linux kernel, from 4.10.0-26 to 4.10.0-28, but the
  installation hangs on the following output lines:

  sudo apt-get install unrar linux-generic linux-headers-generic linux-image-generic linux-signed-generic linux-signed-image-generic
  Configurazione di linux-image-4.10.0-28-generic (4.10.0-28.32)...
  Running depmod.
  update-initramfs: deferring update (hook will be called later)
  Examining /etc/kernel/postinst.d.
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.10.0-28-generic /boot/vmlinuz-4.10.0-28-generic
  run-parts: executing /etc/kernel/postinst.d/dkms 4.10.0-28-generic /boot/vmlinuz-4.10.0-28-generic

  Then I used ps to see running processes on the console, and notice
  this one was blocking post-installation:

  plymouth --ping

  I could not but manually kill plymouth, then the script resumed but
  then froze again a few line later and so on, but is that safe for the
  installation?

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: plymouth 0.9.2-3ubuntu15
  ProcVersionSignature: Ubuntu 4.10.0-26.30-generic 4.10.17
  Uname: Linux 4.10.0-26-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.4-0ubuntu4.4
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Wed Jul 19 22:32:14 2017
  DefaultPlymouth: /usr/share/plymouth/themes/ubuntu-gnome-logo/ubuntu-gnome-logo.plymouth
  InstallationDate: Installed on 2017-05-22 (58 days ago)
  InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412)
  MachineType: Dell Inc. Precision M4800
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-26-generic.efi.signed root=/dev/mapper/vg-root ro quiet splash vt.handoff=7
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-26-generic.efi.signed root=/dev/mapper/vg-root ro quiet splash vt.handoff=7
  SourcePackage: plymouth
  TextPlymouth: /usr/share/plymouth/themes/ubuntu-gnome-text/ubuntu-gnome-text.plymouth
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/02/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: 0T3YTY
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA06:bd01/02/2014:svnDellInc.:pnPrecisionM4800:pvr01:rvnDellInc.:rn0T3YTY:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Precision M4800
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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