I'm running the 6.11 kernel in my PVE testing environment (three nodes, hyperconverged) as well as non-production (currently eleven nodes) using Dell R730 and R740 hardware, along with CEPH and SAN backed storage (iSCSI). The only issue I've seen with 6.11 is my console via iDRAC is unusable, and I haven't found the right way to make that work via grub options so far. Not a huge concern, and I also have not dedicated a lot of time to nail this one down. Something in the kernel is setting a weird mode on the console that the iDRAC cannot handle, or disconnecting the iDRAC virtual console altogether. Plugging in a monitor seems to work OK, though, so it doesn't make a lot of sense.