[Bug 861656] Re: Kernel oops when nbd device is removed before it is unmounted

[Serge Hallyn]

The kernel should (imo) return -EBUSY when when asked to disconnect a
mounted nbd device.  It'd be trivial to do.  But consensus is that it'd
be refused because it should behave like all other disks.

Kvm's qemu-nbd.c *could* detect the condition as well.  But the check
there would be racy.

So we will propose a patch to have nova refuse the disconnect if the
device is busy.

** Also affects: nova (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: nova (Ubuntu)
       Status: New => Confirmed

** Changed in: qemu-kvm (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/861656

Title:
  Kernel oops when nbd device is removed before it is unmounted

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