> On Nov 15, 2021, at 4:58 AM, Michal Hocko <mhocko@xxxxxxxx> wrote: > > On Mon 15-11-21 11:04:16, Alexey Makhalov wrote: >> Hi Michal, >> >>> >>> I have asked several times for details about the specific setup that has >>> led to the reported crash. Without much success so far. Reproduction >>> steps would be the first step. That would allow somebody to work on this >>> at least if Alexey doesn't have time to dive into this deeper. >>> >> >> I didn’t know that repro steps are still not clear. >> >> To reproduce the panic you need to have a system, where you can hot add >> the CPU that belongs to memoryless NUMA node which is not present and onlined >> yet. In other words, by hot adding CPU, you will add both CPU and NUMA node >> at the same time. > > There seems to be something different in your setup because memory less > nodes have reportedly worked on x86. I suspect something must be > different in your setup. Maybe it is that you are adding a cpu that is > outside of possible cpus intialized during boot time. Those should have > their nodes initialized properly - at least per init_cpu_to_node. Your > report doesn't really explain how the cpu is hotadded. Maybe you are > trying to do something that has never been supported on x86. Memoryless nodes are supported by x86. But hot add of such nodes not quite done. > > It would be really great if you can provide more information in the > original email thread. E.g. boot time messges and then more details > about the hotplug operation as well (e.g. which cpu, the node > association, how it is injected to the guest etc.). > I’ll provide more information in the main thread. Regards, —Alexey
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