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The block backend changed in a way that flushing empty CDROM drives now crashes. Amend IDE to avoid doing so until the root problem can be addressed for 2.11. Original patch by John Snow <jsnow@redhat.com>. Reported-by: Kieron Shorrock <kshorrock@paloaltonetworks.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 20170809160212.29976-2-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>