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[Rafael David Tinoco <rafael.tinoco@xxxxxxxxxxxxx>]

Second reproducer for this bug (shell script attaching ceph volumes on kvm machine).
Make sure to run this as 1st level guest (2nd level is slow and don't trigger the issue).

** Attachment added: "teste.sh"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1479031/+attachment/4443005/+files/teste.sh

** Attachment removed: "precise.xml"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1479031/+attachment/4443004/+files/precise.xml

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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:
  In Progress

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.

  As a workaround one can rescan and the device shows up:
  echo 1 | sudo tee /sys/bus/pci/rescan

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