Hi, Since the latest Reef update I have the problem that some of my hosts suddenly go into a state where all CPUs are stuck in kernel mode causing all daemons on that host to become unresponsive. When I connect to the IPMI console, I see a lot of messages like: watchdog: BUG: soft lockup - CPU#8 stuck for 47s! [cron:868840] (it's basically a list of all processes running on the machine). Usually, this resolves itself after several minutes, but sometimes I have to hardreset the host. When this happens, all daemons are marked as down and I cannot interact with the host at all. I don't know what causes this but, I think it happens primarily on the hosts where my MDS run and it seems to be triggered by events such as cluster rebalances, MDS restarts, or just randomly. I found a few reports about similar issues on the bug tracker and mailing list, but they are all very unspecific, unanswered, or more than 6 years old. Is there any way I can debug this? I upgraded to Squid already, but that didn't solve the problem. I also had massive issues with this during the upgrade. Particularly at the end when the MDS were upgraded, I had constant struggles with it. I had to set the noout flag and then literally sit next to it to resume the upgrade every few minutes until it finally went through, because random MDS hosts went intermittently dark all the time. All hosts run Ubuntu 22.04 with kernel 6.8.0. Any ideas? Thanks! Janek