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[Launchpad Bug Tracker <1479031@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.2.0-92.130

---------------
linux (3.2.0-92.130) precise; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1500854

  [ dan.streetman@xxxxxxxxxxxxx ]

  * [Config] HOTPLUG_PCI_ACPI=y
    - LP: #1479031

  [ John Johansen ]

  * SAUCE: (no-up) apparmor: fix mount not handling disconnected paths
    - LP: #1496430

  [ Upstream Kernel Changes ]

  * RDS: verify the underlying transport exists before creating a
    connection
    - LP: #1496232
    - CVE-2015-6937
  * virtio-net: drop NETIF_F_FRAGLIST
    - LP: #1484793
    - CVE-2015-5156

 -- Brad Figg <brad.figg@xxxxxxxxxxxxx>  Mon, 05 Oct 2015 13:50:43 -0700

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

Title:
  attached block devices not showing up

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

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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