Hi Dave, I have a problem with a dump where I have defined five CPUs and two of them are offline. In fact the logical CPUs are defined as follows: 0 on 1 on 2 off 3 off 4 on The CPU online map looks correct: crash> print/x *cpu_online_mask $4 = { bits = {0x13} ---> b10011 } When I issue "ps" I see that all running tasks are idle, but the CPU numbers are not correct (0,1,2 and not 0,1,4): PID PPID CPU TASK ST %MEM VSZ RSS COMM I tried to debug the problem, but got stuck somewhere in "task.c". I think there is a problem with the idle threads initialization, where the online map is not considered. Maybe you can see the bug immediately. Otherwise I will have spend more effort for debugging that problem. I hope not :-) Michael