Okay, I'm trying to classify this bug report about QEMU. The issue is that when using debuggers like mdb, adb, or gdb on Solaris/SunOS, the system panics with a "Nonparity Synchronous Error." First, I need to understand what the problem entails. Debuggers are typically user-mode applications, but when they interact deeply with the operating system, especially in debugging kernel code, they can affect system-level operations. The fact that it's causing a kernel panic suggests that something at the OS level is going wrong. Solaris/SunOS is Unix-based, and kernel panics usually indicate issues in system mode because the kernel has encountered an unrecoverable error. Since the problem occurs during debugging activities which might involve stepping through kernel code or setting breakpoints that affect low-level processes, it's likely related to how QEMU emulates these operations. Considering QEMU's architecture, when running a VM, user-mode applications run within the guest OS, but system calls go through the hypervisor. If the debuggers are causing issues in the guest OS kernel, this would be a problem with how QEMU handles system-level interactions or device emulation, possibly leading to incorrect state that triggers the panic. So, putting it all together, the issue is likely related to how QEMU interacts with the virtualized operating system's kernel when debuggers are used. This points towards a system-mode problem because it affects the OS kernel and causes a panic. system