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<think>
Okay, so I need to classify this bug report: "Running a virtual machine on a Haswell system produces machine check events." The possible categories are mistranslation, assembly lowering, other, device, graphic, socket, network, KVM, boot, vnc, debug, files, permissions, performance, kernel, peripherals, hypervisor.
First, I'll break down the bug report. It mentions running a VM on a Haswell system and machine check events. Machine check exceptions (MCEs) are usually hardware-related errors detected by the CPU. So, when a VM runs on a host with Haswell CPUs, these MCEs occur.
Now, considering the categories: KVM is related to virtualization; it's a hypervisor. The issue here seems to be about how the hypervisor interacts with the hardware. Alternatively, it could be a problem in the kernel or related to peripherals.
But KVM specifically deals with virtual machines and their interaction with host CPUs. Machine check events are often due to CPU errors, which might not be properly handled by KVM, leading to VM crashes or instability. So this seems directly tied to the hypervisor's handling of hardware events during VM execution.
Other categories like network, socket, etc., don't seem relevant here since the issue is about machine checks, which are CPU-related. Therefore, the most appropriate category is hypervisor.
</think>
hypervisor
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