On Tue, Jun 11, 2019 at 8:52 PM Tejun Heo <[email protected]> wrote: > > 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.
This has reached upstream and all subsystem subtrees, now all Linux trees are boot broken (except for few that still lack behind): https://syzkaller.appspot.com/upstream No new Linux code is tested by syzbot at this point.
