[Bug 899795] Re: hang during boot after upgrade to oneiric

[Steve Langasek]

*** This bug is a duplicate of bug 802626 ***
    https://bugs.launchpad.net/bugs/802626

** This bug has been marked a duplicate of bug 802626
   vgchange may deadlock in initramfs when VG present that's not used for rootfs

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Title:
  hang during boot after upgrade to oneiric

Status in “upstart” package in Ubuntu:
  New

Bug description:
  After upgrading to oneirc, and rebooting, system hangs during boot.
  Problem seems to be a bad interaction with upstart, udev, and lvm
  (device mapper) filesystems.  Details below:

  During boot, kernel appears to boot fully. Next set of messages show
  fsck running, and then a hang. Using the old init=/bin/sh trick, I can
  see that all of my file systems are now mounted, except one: a file
  system that lives on an lvm volume. I believe that, at this point,
  upstart is waiting for the lvm volume to come online... but of course,
  it can't/won't until lvm and the device-mapper run, which is typically
  done later, in the /etc/init.d scripts.  (The mount point, a directory
  in /dev/mapper, hasn't yet been created).   Commenting out the lvm
  volume in /etc/fstab allows the boot to proceed, more or less
  normally; the missing file system can then be mounted by hand.

  With the above problem worked around, there is another alarming
  problem: much, much later in the boot, after a number of /etc/init.d
  scripts run, if finally gets around to running /etc/init.d/checkfs,
  which does an ... fsck!  but with upstart, most all file systems are
  already mounted at this point, so the fsck crashes & burns.  In the
  old SysV init scheme, this was correct: the fsck would not run until
  *after* the /etc/init.d/lvm2 scripts ran.

  The clever sysadmin can work around these, but .. wow, it was hard and
  painful to figure out the above.

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