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When kvm.sh is killed, its child processes (make, gcc, qemu, etc.) may continue running. This prevents new kvm.sh instances from starting even though the parent is gone. Add a --kill-previous option that uses fuser(1) to terminate all processes holding the flock file before attempting to acquire it. This provides a clean way to recover from stale/zombie kvm.sh runs which sometimes may have lots of qemu and compiler processes still disturbing. Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com> Tested-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>