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[Bug 1251716] Re: xenapi: issues with concurrent builds

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Wed, 04 Dec 2013 10:27:50 -0000
Reply-to: Bug 1251716 <1251716@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: nova
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1251716

Title:
  xenapi: issues with concurrent builds

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Currently, when you build two VMs at once, or resize two VMs at once,
  you can hit a race condition in XenServer's VBD.plug in XenServer 6.1
  and later, and there are issues with tapdisk hanging during the
  VBD.unplug

  It is apparently related to this change:
  https://github.com/xapi-project/xen-api/commit/750d3bdd6d0431d312fc3363b03edb90e9124b4c

  There is no public bug report, but the agreed workaround is to ensure
  you only have a single VBD.plug happening at once per VM.

  The issue we have is running nova-compute in a VM means we can only
  have on VBD.plug at once inside the nova-compute VM.

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