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<think>
Okay, I need to classify this QEMU bug report as either user-mode or system-mode related. Let's look at the details provided.
First, on both the source and destination sides, the processes are stuck in ppoll calls. The strace output shows that they're waiting on eventfds and sockets. Eventfds are used for inter-thread communication, which is a lower-level system resource. Sockets might indicate networking or migration-related issues.
Looking at the backtraces from GDB, both processes are deep into QEMU's main loop. This suggests that the issue isn't in userland applications but within QEMU itself, possibly handling I/O or device emulation.
The mention of eventfds and sockets points towards kernel-level resources, which fall under system-mode operations. Additionally, the fact that it's a bug report about QEMU, which often deals with emulating hardware devices and managing virtual systems, leans towards system-mode issues.
Therefore, this bug is likely related to how QEMU interacts with system resources, making it a system-mode issue.
</think>
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