Hello, On Fri, Jun 07, 2019 at 10:45:45AM +0200, Dmitry Vyukov wrote: > +workqueue maintainers and Michael who added this WARNING > > The WARNING was added in 2017, so I guess it's a change somewhere else > that triggered it. > The WARNING message does not seem to give enough info about the caller > (should it be changed to WARN_ONCE to print a stack?). How can be root > cause this and unbreak linux-next?
So, during boot, workqueue builds masks of possible cpus of each node and stores them on wq_numa_possible_cpumask[] array. The warning is saying that somehow online cpumask of a node became a superset of the possible mask, which should never happen. Dumping all masks in wq_numa_possible_cpumasks[] and cpumask_of_node() of each node should show what's going on. Thanks. -- tejun
