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[Bug 1451277] Re: Extremely high IOWait and processes hungs after utopic->vivid upgrade


After more research, I can confirm the bug and I hope I have also
determined the cause...

1) Bug also happens when booting from the vivid iso image... so it is
not dependent from leftovers due to the utopic->vivid upgrade.

2) Bug stops manifesting if I detach the IOMEGA ZIP drive (with ide
connection) that I have in this machine

I understand that the piece of hardware is obsolete, but it was working
just fine with utopic.

It is still not clear too me if the bug is in the kernel itself or in
something in the system that causes it to be polled too frequently.

Please, propagate upstream.

** Package changed: ubuntu => linux-meta (Ubuntu)

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  Extremely high IOWait and processes hungs after utopic->vivid upgrade

Status in linux-meta package in Ubuntu:

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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