Hello, On Wed, Aug 30, 2017 at 06:23:50PM +0530, Neeraj Upadhyay wrote: > cpuset_hotplug_workfn() > cgroup_transfer_tasks() > cgroup_migrate() > cgroup_migrate_execute() > <TASK EXIT> > list_del_init(&task->cg_list) > cpuset_attach() > cgroup_taskset_first(tset, &css) // css is not set > guarantee_online_mems(cs, ...) // data abort
I don't think this can happen anymore. We lock out task exits during migration and don't call migration callbacks if there's no tasks to migrate. Thanks. -- tejun