** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic

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https://bugs.launchpad.net/bugs/1906850

Title:
  aws: xen-netfront: prevent potential error on hibernate

Status in linux-aws package in Ubuntu:
  Fix Released
Status in linux-aws source package in Bionic:
  Fix Committed
Status in linux-aws source package in Focal:
  Fix Released
Status in linux-aws source package in Groovy:
  Fix Committed

Bug description:
  [Impact]

  On hibernation xen-netfront is setting the device state on the xenbus
  to "Closing" and then it's waiting for the backend state to
  acknowledge that state (with a timeout). However, if the device is
  already in the state "Closed" this opteration will always hit the
  timeout, preventing the system to hibernate correctly.

  [Test case]

  It is a quite rare condition that can be reproduced
  hibernating/resuming a Xen instance multiple times. When the problem
  happens we should in the log a Xen error message like the following:

    Freezing timed out; the device may become inconsistent state

  [Fix]

  If the device is already in the state "Closed", simply tear it down
  without notifying the Xen backend.

  [Regression potential]

  The fix would just prevent aborting hibernation if the netfront device
  is already in a "Closed" state. The resume callback is forcing the
  device into the "Initializing" state anyway, basically forcing a reset
  of the device, so nothing else in the state machine can be potentially
  broken.

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