Thanks for confirming this bug and for the fast turnaround. Update on the HWE 7.0 kernel test on srv05: it has now been running kernel 7.0.0-29-generic for **over 33 hours (uptime since 2026-08-18 16:20:03)** under normal production load, with all 20 guest VMs running continuously and no kernel panic.
``` ubuntu@srv05:~$ uptime -s 2026-08-18 16:20:03 ubuntu@srv05:~$ uptime 09:05:26 up 1 day, 16:45, 1 user, load average: 4.20, 4.39, 4.44 ``` This comfortably exceeds the 1-24 hour window in which panics previously occurred on 6.8.0-137-generic across all 5 affected hosts, so I'm fairly confident the HWE 7.0 kernel resolves the issue on this host. I took a closer look at the commit you linked (9709eb0f845b713ba163f2c461537d8add3e4e04, "sched/numa: fix task swap by skipping kernel threads"). It modifies `task_numa_compare()` in `kernel/sched/fair.c` to also exclude kernel threads (`PF_KTHREAD`) and userspace tasks without an `mm` from being selected as NUMA balancing swap targets - previously only `PF_EXITING` and the idle task were excluded. Given that our panics consistently trace through `multi_cpu_stop`/`cpu_stopper_thread`, and that NUMA task-swap interacting with the stopper machinery matches a known historical failure mode (a 2018 LKML thread on cpu stopper threads and load balancing deadlocking, which I referenced in the original report), this looks like a strong candidate for the actual root cause rather than a coincidental fix. I'll continue monitoring srv05 and plan to roll the same kernel out to the remaining affected hosts (srv04, srv06, srv07, srv08) if stability holds. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2163642 Title: Kernel panic "Attempted to kill the idle task" on AMD Opteron multi- node NUMA under KVM (6.8.0-137) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2163642/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
