[Bug 964957] Re: Installer warns "Could not stat device /dev/mapper/hostname-root - No such file or directory", works after retry

[Launchpad Bug Tracker]

** Branch linked: lp:~ubuntu-core-dev/partman-auto-lvm/precise

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https://bugs.launchpad.net/bugs/964957

Title:
  Installer warns "Could not stat device /dev/mapper/hostname-root - No
  such file or directory", works after retry

Status in “partman-auto-lvm” package in Ubuntu:
  Fix Released
Status in “partman-auto-lvm” source package in Precise:
  Confirmed

Bug description:
  [Impact]
  Installs using LVM can fail due to a race with the message "Could not stat device /dev/mapper/$hostname-root - No such file or directory". This is very reproducible on some systems, but not others (presumably due to timing). I've had good luck reproducing w/ a kvm VM. During manual installs this is a fairly minor error - selecting "Retry" allows the install to continue. However, this is a fatal error on automated installs.
  [Test Case]
  Do an LVM install using d-i - manual or preseeded and look for the above error message.
  [Regression Potential]
  This introduced a new call into the udev stack, so a bug there could trip us up - but, it seems like if any such bug existed, we'd hit it already w/ one of the other settle calls.

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