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Currently, a system that stops responding at the wrong time will hang kvm-remote.sh. This can happen when the system in question is forced offline for maintenance, and there is currently no way for the user to kick this script into moving ahead. This commit therefore causes kvm-remote.sh to wait at most 15 minutes for a non-responsive system, that is, a system for which ssh gives an exit code of 255. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>