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[Sergio Callegari <sergio.callegari@xxxxxxxxx>]

Bisected.

Bug seen after commit 045065d8a300a37218c548e9aa7becd581c6a0e8 [SCSI]
fix qemu boot hang problem.

Actually, the problem is not with that commit that is perfectly fine.
That commit merely lets the real bug be triggered.

Real bug is with scsi host lock and likely to be triggered by mixing a
slow and a fast device on the same IDE/SATA channel.

Bug is also biting other distros. See
https://bbs.archlinux.org/viewtopic.php?id=189324

Bug is known to kernel developers.

https://lkml.org/lkml/2015/8/16/44

https://bugzilla.kernel.org/show_bug.cgi?id=87581

Bug is fixed by following patch by Christoph Hellwig, that unfortunately
is not yet applied upstream

https://lkml.org/lkml/2014/11/20/581

** Bug watch added: Linux Kernel Bug Tracker #87581
   http://bugzilla.kernel.org/show_bug.cgi?id=87581

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1451277

Title:
  Extremely high IOWait and processes hungs after utopic->vivid upgrade
  with Iomega Zip drive (IDE)

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On Kubuntu, 64 bit AMD Phenom2 machine with 4 cores, and old (Geoforge 7025) Nvidia graphics.
  Using LVM. Machine also has a 2 disk software raid (mirroring).

  The machine was working fine before the upgrade, now it is almost
  impossible to use it... I see Wait in Top always above 60%; in dmesg
  after a few minutes that the machine is up even if the machine does
  nothing. I see hung processes (typically vgs, but occasionally also
  others).  LVM related commands (e.g. lvdisplay) almost always hung at
  the terminal. I also see in ps some kernel workers almost constantly
  stuck in D state. Also, the machine takes ages to shutdown.

  Issue remains there also if I disable X (switch off the X login
  manager, sddm) and check at the console.

  Sorry I cannot provide details with apport, but the machine has been
  switched off and I will not be able to take it up again before a few
  days from now.

  The symptom I am observing may also be a sign of failing hardware, so
  please leave the bug as unconfirmed until I make some more tests or
  someone provide details on similar issues. In the meantime I would
  like to see if others are experiencing a similar serious issue. Is
  there anything specific that has changed between utopic and vivid, I
  should look into?

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