[Bug 864262] Re: remounting filesystems hangs uninterruptibly if network filesystems are unavailable

[jhansonxi]

A similar situation occurs when an encrypted filesystem is listed in
crypttab with local key file specified but the key has an error which
prevents unlocking the volume.  The boot process hangs and so does
friendly-recovery during RW mount attempts.  This key situation may seem
odd but it involves an encrypted root volume that has the key for an
encrypted /home but the key has an error so it fails to unlock.

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https://bugs.launchpad.net/bugs/864262

Title:
  remounting filesystems hangs uninterruptibly if network filesystems
  are unavailable

Status in “friendly-recovery” package in Ubuntu:
  Triaged

Bug description:
  The "mount filesystems" and "check filesystems" options work by
  calling mountall.  This is the correct thing to do; however, if there
  are filesystems listed in the fstab that are unavailable (for
  instance, because they're network filesystems and the network hasn't
  been brought up, or the server is down, or they refer to unavailable
  disks), mountall will hang *indefinitely* waiting for them to become
  available - particularly in the case of filesystems that it knows are
  network filesystems.

  This is not a problem when it happens during a normal boot, because
  mountall will continue to run in the background.  However, when
  mountall is run from friendly-recovery, it becomes the foregrounded
  console process and there's no way to reasonably interrupt this to
  return to the recovery menu - you effectively have to reboot to get
  back to the other recovery options (and probably use SysRq in the
  process if you want to actually ensure your rootfs gets cleanly
  unmounted).

  We probably need some improvements to the mountall interface to allow
  a "one-shot" approach to mounting network filesystems when called from
  friendly-recovery.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: friendly-recovery 0.2.18
  ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
  Uname: Linux 3.0.0-11-generic x86_64
  ApportVersion: 1.23-0ubuntu2
  Architecture: amd64
  Date: Sat Oct  1 12:29:46 2011
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: friendly-recovery
  UpgradeStatus: Upgraded to oneiric on 2011-09-23 (7 days ago)

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