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    SubjectRe: rcu stalls seen with numasched_v2 patches applied.
    * Peter Zijlstra <peterz@infradead.org> [2012-08-13 09:51:13]:

    > On Fri, 2012-08-10 at 21:54 +0530, Srikar Dronamraju wrote:
    >
    > > This change worked well on the 2 node machine
    > > but on the 8 node machine it hangs with repeated messages
    > >
    > > Pid: 60935, comm: numa01 Tainted: G W 3.5.0-numasched_v2_020812+ #4
    > > Call Trace:
    > > <IRQ> [<ffffffff810d32e2>] ? rcu_check_callback s+0x632/0x650
    > > [<ffffffff81061bb8>] ? update_process_times+0x48/0x90
    > > [<ffffffff810a2a4e>] ? tick_sched_timer+0x6e/0xe0
    > > [<ffffffff81079c85>] ? __run_hrtimer+0x75/0x1a0
    > > [<ffffffff810a29e0>] ? tick_setup_sched_timer+0x100/0x100
    > > [<ffffffff8107a036>] ? hrtimer_interrupt+0xf6/0x250
    > > [<ffffffff814f1379>] ? smp_apic_timer_interrupt+0x69/0x99
    > > [<ffffffff814f034a>] ? apic_timer_interrupt+0x6a/0x70
    > > <EOI> [<ffffffff811082e3>] ? wait_on_page_bit+0x73/0x80
    > > [<ffffffff814e7992>] ? _raw_spin_lock+0x22/0x30
    > > [<ffffffff81131bf3>] ? handle_pte_fault+0x1b3/0xca0
    > > [<ffffffff814e64f7>] ? __schedule+0x2e7/0x710
    > > [<ffffffff8107a9a8>] ? up_read+0x18/0x30
    > > [<ffffffff814eb2be>] ? do_page_fault+0x13e/0x460
    > > [<ffffffff810137ba>] ? __switch_to+0x1aa/0x460
    > > [<ffffffff814e64f7>] ? __schedule+0x2e7/0x710
    > > [<ffffffff814e7de5>] ? page_fault+0x25/0x30
    > > { 3} (t=62998 jiffies)
    > >
    >
    > If you run a -tip kernel without the numa patches, does that work?
    >

    Running on -tip kernel seems okay. Will see if I can bisect the patch
    that causes this issue and let you know.

    --
    Thanks and Regards
    Srikar



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