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[Edward Hope-Morley <edward.hope-morley@xxxxxxxxxxxxx>]

Public bug reported:

I have Ubuntu Precise guests running in kvm to which I attach volumes
immediately after boot. Sometimes I notice that the devices do not show
up in the guest e.g. they are not visible in /proc/partitions and dmesg
boot log shows no sign of then being noticed. Qemu itself shows that the
devices are attached and if I do a rescan within the guest the devices
appear. A reboot also cause the devices to appear. So, it feels like
there is enough evidence to suggest that the devices were properly
attached by qemu/seabios but they just didn't get noticed by the guest.

This issue is reproducible with Precise running 3.2, 3.5 (lts-quantal)
and 3.8 (lts-raring) kernels but not as of 3.11 (lts-saucy) so it would
appear that something changed between 3.8 and 3.11 that resolved this
issue and if we can identify it we should backport to 3.2.

I am able to reproduce this issue using Openstack to spin up vms and
attach volumes using the following script:

http://pastebin.ubuntu.com/11954253/

I hit this issue with 1/2 instances.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: linux (Ubuntu Precise)
     Importance: Undecided
     Assignee: Chris J Arges (arges)
         Status: New

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https://bugs.launchpad.net/bugs/1479031

Title:
  attached block devices not showing up

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Precise:
  New

Bug description:
  I have Ubuntu Precise guests running in kvm to which I attach volumes
  immediately after boot. Sometimes I notice that the devices do not
  show up in the guest e.g. they are not visible in /proc/partitions and
  dmesg boot log shows no sign of then being noticed. Qemu itself shows
  that the devices are attached and if I do a rescan within the guest
  the devices appear. A reboot also cause the devices to appear. So, it
  feels like there is enough evidence to suggest that the devices were
  properly attached by qemu/seabios but they just didn't get noticed by
  the guest.

  This issue is reproducible with Precise running 3.2, 3.5 (lts-quantal)
  and 3.8 (lts-raring) kernels but not as of 3.11 (lts-saucy) so it
  would appear that something changed between 3.8 and 3.11 that resolved
  this issue and if we can identify it we should backport to 3.2.

  I am able to reproduce this issue using Openstack to spin up vms and
  attach volumes using the following script:

  http://pastebin.ubuntu.com/11954253/

  I hit this issue with 1/2 instances.

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