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The rcutorture scripting will do a "kill -9" on any guest OS that exceeds its --duration by more than a few minutes, which is very valuable when bugs result in hangs. However, this is a problem when the "hang" was due to a --gdb debugging session. This commit therefore refrains from killing the guest OS when a debugging session is in progress. This means that the user must manually kill the kvm.sh process group if a hang really does occur. Signed-off-by: Paul E. McKenney <paulmck@kernel.org>