Interesting changes in recent Linux regarding cpusets:
Kernel 6.11: Make cpuset.cpus.exclusive independent of cpuset.cpus commit
Kernel 6.12: Account for boot time isolated CPUs commit, commit
Not sure if it's the same issue, but I've encountered a very similar case without KSM.
I am trying to remove a swap partition after adding another one. Soon after 'swapoff /dev/oldSwapDev', both pvestatd and most shell commands locked up trying...