** Tags added: cscc

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https://bugs.launchpad.net/bugs/1802341

Title:
  crash in ENA driver on removing an interface

Status in linux package in Ubuntu:
  Fix Released
Status in linux-aws package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux-aws source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in linux-aws source package in Bionic:
  Fix Released
Status in linux source package in Cosmic:
  Fix Released
Status in linux-aws source package in Cosmic:
  Fix Released
Status in linux source package in Disco:
  Fix Released
Status in linux-aws source package in Disco:
  Fix Released

Bug description:
  Bug present in ENA since driver version 1.6; manifests as a crash only
  under some conditions.

  In ena_remove() we have the following stack call:
      ena_remove()
        unregister_netdev()
        ena_destroy_device()
          netif_carrier_off()
      
  Calling netif_carrier_off() causes linkwatch to try to handle the
  link change event on the already unregistered netdev, which leads
  to a read from an unreadable memory address.

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