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<think>
Okay, I need to classify this bug report as either user-mode or system-mode related. Let's see the details.
The issue is about QEMU on PowerPC where shutdown and reboot are failing due to CUDA errors. The logs show a lot of CUDA packet sends and receives, which suggests it's related to device emulation in QEMU.
User-mode bugs usually involve application-level issues, like programs crashing or not working as expected. System-mode involves lower-level components like the OS kernel, hardware drivers, or emulated peripherals.
Here, the problem is with the firmware (OpenBIOS) and how CUDA interacts during shutdown/reboot. This is part of the system's initialization and shutdown processes, which are low-level operations managed by the OS and hardware emulation in QEMU.
So, it's a system-mode issue because it involves device drivers and firmware interactions that require higher privileges and affect the entire system operation.
</think>
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