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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