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<think>
Okay, I need to classify this bug report into one of the given categories. The bug is about QEMU crashing with a segfault when using vcpu hotplug on KVM for Power8 systems.
Looking at the details: The user tried adding another CPU core via 'device_add host-spapr-cpu-core' and got a segmentation fault. This indicates a crash in the hypervisor, which in this case is KVM.
The categories include 'hypervisor', which seems directly related because KVM is the hypervisor component here. Other options like 'network' or 'graphic' don't apply since the issue isn't with networking or graphics but rather the CPU hotplug functionality.
So, the crash is happening within the hypervisor's code when handling vcpu hotplug, making 'hypervisor' the correct category.
</think>
The bug report involves a segmentation fault when adding a new vcpu in KVM. This points to an issue in the hypervisor itself, as it's responsible for managing virtual CPUs and their hotplugging.
hypervisor
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