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0236bd0907
The `qemu` driver uses our universal executor to run the qemu command line tool. Because qemu owns the resource isolation, we don't pass in the resource block that the universal executor uses to configure cgroups and core pinning. This resulted in a panic. Fix the panic by returning early in the cgroup configuration in the universal executor. This fixes `qemu` but also any third-party drivers that might exist and are using our executor code without passing in the resource block. In future work, we should ensure that the `resources` block is being translated into qemu equivalents, so that we have support for things like NUMA-aware scheduling for that driver. Fixes: https://github.com/hashicorp/nomad/issues/19078