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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 19:39:53 +0200
commitdee4dcba78baf712cab403d47d9db319ab7f95d6 (patch)
tree418478faf06786701a56268672f73d6b0b4eb239 /results/classifier/deepseek-r1:14b/reasoning/manual-review/2006
parent4d9e26c0333abd39bdbd039dcdb30ed429c475ba (diff)
downloadqemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.tar.gz
qemu-analysis-dee4dcba78baf712cab403d47d9db319ab7f95d6.zip
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+<think>
+Alright, let's try to classify this bug report for QEMU. The user is having trouble with VM migration failing on Proxmox 8, specifically on R630 clusters but not on R730 or R740 clusters. They provided logs showing rcu_preempt messages during the migration.
+
+First, I need to understand what these rcu_preempt messages mean. From what I know, RCU stands for Read-Copy-Update, which is a synchronization mechanism in the Linux kernel used for handling concurrent access to data structures. The rcu_preempt messages often indicate issues with CPU preemption or scheduling problems during garbage collection of RCU structures.
+
+The logs mention that the rcu_preempt kthread is starving, meaning it's not getting enough CPU time. This can cause delays in processing tasks, leading to failures like VM migration issues. The user also tried downgrading QEMU-KVM but still faced the problem, suggesting it's not related to a specific version but perhaps hardware or configuration differences.
+
+Looking at the possible categories: mistranslation, assembly, other, device, graphic, socket, network, KVM, boot, vnc, debug, files, permissions, performance, kernel, peripherals, hypervisor.
+
+The error seems to stem from the Linux kernel's RCU mechanism not functioning correctly during VM migration. Since this is related to kernel internals and CPU scheduling, it doesn't fit into categories like device, graphic, or network directly. It also isn't a translation issue (mistranslation) or a performance problem per se.
+
+Considering that the issue occurs during a hypervisor operation (migration in KVM), but the root cause lies within the kernel's RCU handling. Therefore, it might fall under 'kernel' category as the problem is with the Linux kernel's behavior rather than QEMU itself. Alternatively, since the issue arises during a KVM migration process, it could be related to hypervisor functions.
+
+But given that the error messages are from the kernel's RCU subsystem and not directly from QEMU or KVM code, I think 'kernel' is the most appropriate category here. It indicates a problem with the underlying OS kernel rather than the virtualization layer.
+</think>
+
+The bug report involves issues related to the Linux kernel's RCU mechanism during VM migration on certain hardware clusters, specifically R630. The problem arises from CPU scheduling and preemption issues affecting the rcu_preempt kthread. Since this is a kernel-level issue and not directly tied to QEMU or KVM but rather the underlying OS behavior, it falls under the 'kernel' category.
+
+**Kernel**
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