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[Bug 973413] Re: mount nbd hangs because of previous umount failure

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Wed, 22 Jan 2014 16:10:18 -0000
Reply-to: Bug 973413 <973413@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

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

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https://bugs.launchpad.net/bugs/973413

Title:
  mount nbd hangs because of previous umount failure

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Scenario: 
  While injecting data in an instance, if the umount command fails, the 
  qemu-nbd disconnect command also fails and the device becomes unusable.
  However, the device (/dev/nbd15) gets added back to the available device list.
  So, if another instance is launched (with some injected data), it tries to use the
  same nbd device (/dev/nbd15) which contains a stale connection.

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