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    SubjectRe: [PATCH] sched_groups are expected to be circular linked list, make it so right after allocation
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    On Thu, 2012-05-10 at 15:26 +0200, Igor Mammedov wrote:
    > [ 141.699854] sched: Bonkers domain doesn't include its own cpu: 3 0-1,3
    > [ 141.725038] sched: Bonkers domain doesn't include its own cpu: 3 0-1

    Whee!! so cpu_mask (active_mask) does include 3, but the tl->mask()
    doesn't.

    > [ 141.775040] sched: Topology is hosed for CPU-3!!
    > [ 141.775596] sched: domain: NODE 0-1
    > [ 141.776004] sched: group: 0-1
    >
    This seems to suggest its the node topology being wrecked.

    which with your code-base would be
    cpu_node_mask()->sched_domain_node_span()..

    Did you specify any node topology on the qemu command line? If not, it
    should all reduce to cpumask_of_node(0).

    identify_secondary_cpu()->identify_cpu()->numa_add_cpu() should set that
    bit. which is well before the CPU_ONLINE->cpuset_update_active_cpus()
    sched domain rebuild.


    Most puzzling. Can you dig a little deeper as to why these masks might
    be wrong? Also, can you reproduce on actual hardware? The reason I never
    use kvm or other virt for debugging is that I always end up spending
    time chasing virt bugs, and I hate virt..


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