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

Testing patches I have attached above:

inaddy@sf00090138trusty(~)$ sudo qemu-img create -f qcow2 -o preallocation=metadata ./test.qcow2 1G
Formatting './test.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536 preallocation='metadata' lazy_refcounts=off

inaddy@sf00090138trusty(~)$ sudo qemu-nbd --connect=/dev/nbd0
./test.qcow2

[   34.348125] nbd: registered device at major 43
[  317.034493]  nbd0: unknown partition table

inaddy@sf00090138trusty(~)$ sudo fdisk /dev/nbd0

     Device Boot      Start         End      Blocks   Id  System
/dev/nbd0p1            2048     2097151     1047552   83  Linux

inaddy@sf00090138trusty(~)$ sudo mkfs.ext3 /dev/nbd0p1

inaddy@sf00090138trusty(~)$ sudo mkfs.ext3 /dev/nbd0p1

inaddy@sf00090138trusty(~)$ sudo mount /dev/nbd0p1 /mnt

inaddy@sf00090138trusty(/mnt)$ dd if=/dev/zero of=./teste bs=1M count=256 oflag=direct
256+0 records in
256+0 records out
268435456 bytes (268 MB) copied, 1.15586 s, 232 MB/s

Hopefully they won't cause any regression the PPA to be provided soon.

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https://bugs.launchpad.net/bugs/1505564

Title:
  Soft lockup with "block nbdX: Attempted send on closed socket" spam

Status in linux package in Ubuntu:
  In Progress

Bug description:
  Some of our nova compute hosts regularly freeze, sometimes for a few
  hours, with kern.log getting spammed with:

  block nbdX: Attempted send on closed socket

  and a few "CPU soft lockup" messages (see attached log). This clears
  up when the queue gets cleared, eg :

  block nbdX: queue cleared

  trusty hosts with kernel version 3.19.0-30-generic.

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