[Bug 1292234] Re: qcow2 image corruption in trusty (qemu 1.7 and 2.0 candidate)

[Serge Hallyn]

As far as I know, everyone who has experienced this has been using a
thinkpad.  I've first experienced this myself last week, on a new
thinkpad running utopic.

Two curious things I noticed, beside this being a thinkpad:

1. I could not start the VM with the bad image at all.  Until I rebooted.
Then the image was fine, and fsck-clean.  This suggests a possible problem
with the page cache on the host.

2. I then disabled KSM.  I have not seen this problem since then, however I
also have not hit a vm quite as hard yet.  Will have to see whether a series
of package builds manages to make this happen again with KSM disabled.

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https://bugs.launchpad.net/bugs/1292234

Title:
  qcow2 image corruption in trusty (qemu 1.7 and 2.0 candidate)

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