[Bug 1672659] Re: Upstart waits indefinitely for LVM devices making boot process hang

[Marcin Krol]

Bug is more generic. Basically if some device listed in /etc/fstab is
not available mountall job will hang forever. Example:

1. System has root crypted with password
2. All LVM volumes are on disk crypted with key file placed on root device
3. fstab contains references to LVM volumes

Result:

1. Systems asks for root device password and it is successfully mounted
2. System doesn't decrypt disk with LVM volumes
3. LVM volumes are not available so mountall hangs and systemd doesn't boot

As previously, this can be fixed with simple script in /etc/initramfs-
tools/scripts/local-bottom that decrypts LVM disk and issues lvm
vgchange -ay. Again, problem doesn't exist when using systemd.

** Summary changed:

- Upstart waits indefinitely for LVM devices making boot process hang
+ Upstart (mountall job) waits indefinitely for devices making boot process hang

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https://bugs.launchpad.net/bugs/1672659

Title:
  Upstart (mountall job) waits indefinitely for devices making boot
  process hang

Status in upstart package in Ubuntu:
  New

Bug description:
  After upgrading one of my machines from 14.04 to 16.04 and switching
  back to upstart the system stopped booting. It turned out that after
  initramfs inovokes /sbin/init system hangs on mountall job waiting
  indefinitely for LVM devices to appear.

  Problem affects all 16.04 installations (both 14.04 upgrades or fresh
  ones) where LVM devices are included in /etc/fstab. Below are example
  log entries that are filling /var/log/upstart/mountall.log when
  "init=/sbin/upstart --debug" is added to kernel command line:

  try_mount: /var/lib/postgresql waiting for device
  try_mount: /var/spool/bacula waiting for device
  try_mount: UUID=886c73fd-8392-4361-956e-9cda47b0eb65 waiting for device

  My system is:

  Description:    Ubuntu 16.04.2 LTS
  Release:        16.04

  All devices in fstab are referenced by UUIDs.

  To workaround the problem simple script executing "lvm vgchange -ay"
  must be created and placed in /etc/initramfs-tools/scripts/local-top

  Problem doesn't exist when using systemd.

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