[Bug 1457639] Re: qemu-img qcow2 conversion hangs on large core systems

[William Grant]

On 28/10/15 08:42, dann frazier wrote:
> Sorry for the additional post - I just noticed that @Haw was asking
> about trusty.
> 
> As I recall, the issue fixed by the patch I provided was introduced in
> vivid, and was fixed before wily. In other words, only vivid should be
> impacted. I'm surprised to hear that it impacts trusty.

It's the kilo cloud-archive version that we're using, which is a
backport of vivid's. It's vivid that needs the SRU.

 affects cloud-archive


** Also affects: cloud-archive
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1457639

Title:
  qemu-img qcow2 conversion hangs on large core systems

Status in ubuntu-cloud-archive:
  New
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Trusty:
  New
Status in qemu source package in Vivid:
  In Progress
Status in qemu source package in Wily:
  Fix Released

Bug description:
  [Impact]
  qemu-img frequently hangs when converting a file to qcow2 on a system with a large number of cores.

  [Test Case]
  On a system with a large number of cores (my test system has 48), run:

  wget http://cloud-images.ubuntu.com/trusty/current/trusty-server-cloudimg-arm64-disk1.img -O disk.img
  for i in $(seq 1 10); do qemu-img convert -O qcow2 disk.img disk.qcow2; done

  Mine always hangs within the first 3 iterations.

  [Regression Risk]
  Fix is a clean cherry pick from upstream, which should give us a clear path to resolution if regressions are found.

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