Mastering Proxmox - Third Edition

Issue – kernel panic when disconnecting USB devices, such as a keyboard, mouse, or UPS

There is no real solution to this issue yet, as the issue is not reproducible all the time. This issue has been seen on a variety of hardware with both standard and nonstandard Proxmox installations. However, almost all of the time, the issue does not cause the server to freeze permanently, thus the panic can just be ignored and you can go on as usual.

Kernel panic seems to mostly occur with kernels 2.6.32-26, 2.6.32-27, and 2.6.32-28. It is nonexistent in kernel 3.2 and later. For the regular day-to-day operations of a cluster, this issue can be safely ignored unless it causes the node to freeze on occasions.