----- "Michael Holzheu" <holzheu@xxxxxxxxxxxxxxxxxx> wrote: > Hi again, > > When I change get_smp_cpus() to return "get_highest_cpu_online() + 1" I > > see five swapper idle tasks when using "ps". The problem I now have is > > that I have to provide a backtrace for the offline cpus. But the offline > > CPUs do not have any stack on s390. Is there a way to tell crash that > > there is no backtrace available? Probably I overlooked something... > > Ok, I think I got it now. In case of an offline CPU, I will use > "task_struct_thread_ksp" like I do it for non active tasks. > > When I do that I get for the swapper tasks with the offline CPUs: > > PID: 0 TASK: 18d38340 CPU: 2 COMMAND: "swapper" > #0 [18d3feb8] ret_from_fork at 117e12 > > PID: 0 TASK: 18d40440 CPU: 3 COMMAND: "swapper" > #0 [18d47eb8] ret_from_fork at 117e12 I'm not why you should do anything. The cpu is offline and for all practical purposes it doesn't exist, so why bother? The patch I have queued just uses get_highest_cpu_online()+1 and does nothing else. But I only tested it on a live system, and any backtrace attempt on the offlined swapper task just shows (active). What happens when you do a "bt -a" with a dumpfile? Dave -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility
