Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: In Progress

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

Title:
  crash in ENA driver on removing an interface

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