On Thu, Sep 28, 2017 at 12:35:41PM +0200, Peter Zijlstra wrote: >On Thu, Sep 28, 2017 at 02:14:15AM -0700, Sasha Levin wrote: >> On Thu, Sep 7, 2017 at 8:03 AM, Peter Zijlstra <pet...@infradead.org> wrote: >> > Migrating tasks to offline CPUs is a pretty big fail, warn about it. >> >> Hey Peter, >> >> This seems to get hit on the latest -next: >> >> [2035565360.446794] Unregister pv shared memory for cpu 2 >> [2035565360.467930] numa_remove_cpu cpu 2 node 2: mask now 6 >> [2035565360.471431] ------------[ cut here ]------------ >> [2035565360.472548] WARNING: CPU: 2 PID: 24 at > kernel/sched/core.c:1178 >> set_task_cpu (kernel/sched/core.c:1157) >> [2035565360.473840] Modules linked in: >> [2035565360.474632] CPU: 2 PID: 24 Comm: migration/2 Not tainted > >> 4.14.0-rc2-next-20170927+ #252 > >Urgh, weird. That really shouldn't happen. Can you easily reproduce?
Looks like yes. Seems like it's enough to stress CPU hotplug + trinity. If you have patches you want me try send them my way. -- Thanks, Sasha