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    SubjectWarning: NO_HZ FULL will not work with unstable sched clock
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    Hi,
    It first appeared some time after 3.9 or 3.10 and still persist.
    I guess bisect is not required?

    WARNING: CPU: 1 PID: 6 at kernel/time/tick-sched.c:187
    can_stop_full_tick+0x8d/0x9a()
    NO_HZ FULL will not work with unstable sched clock
    Modules linked in:

    CPU: 1 PID: 6 Comm: kworker/u8:0 Not tainted 3.12.0-01714-ga1212d2 #1
    Hardware name: /D525MW, BIOS
    MWPNT10N.86A.0084.2011.0726.1300 07/26/2011
    00000000000000bb ffff8800bea83e88 ffffffff813ba3b0 0000000000000050
    ffff8800bea83ed8 ffff8800bea83ec8 ffffffff81031441 ffff8800bb07a170
    ffffffff810687db 0000000000000000 0000000000000001 ffff8800bea91ac0
    Call Trace:
    <IRQ> [<ffffffff813ba3b0>] dump_stack+0x46/0x58
    [<ffffffff81031441>] warn_slowpath_common+0x78/0x92
    [<ffffffff810687db>] ? can_stop_full_tick+0x8d/0x9a
    [<ffffffff810314f1>] warn_slowpath_fmt+0x42/0x44
    [<ffffffff81052353>] ? account_system_time+0x114/0x15c
    [<ffffffff810687db>] can_stop_full_tick+0x8d/0x9a
    [<ffffffff810689ef>] tick_nohz_irq_exit+0x77/0x93
    [<ffffffff81034c28>] irq_exit+0xd3/0xdc
    [<ffffffff81021b7c>] smp_apic_timer_interrupt+0x40/0x4d
    [<ffffffff813c474a>] apic_timer_interrupt+0x6a/0x70
    <EOI> [<ffffffff8104da85>] ? finish_task_switch+0x6f/0xd1
    [<ffffffff8104da5a>] ? finish_task_switch+0x44/0xd1
    [<ffffffff813bd0ae>] __schedule+0x75a/0x7f3
    [<ffffffff813be291>] ? _raw_spin_unlock_irqrestore+0x9/0xb
    [<ffffffff8104d704>] ? complete+0x43/0x4b
    [<ffffffff8104068c>] ? umh_complete+0x17/0x20
    [<ffffffff81040710>] ? __call_usermodehelper+0x7b/0x80
    [<ffffffff81042b96>] ? process_one_work+0x2f4/0x304
    [<ffffffff813bd3f6>] schedule+0x5f/0x61
    [<ffffffff810433ba>] worker_thread+0x2a8/0x2ad
    [<ffffffff81043112>] ? manage_workers.isra.31+0x1b9/0x1b9
    [<ffffffff81047b86>] kthread+0xb6/0xbe
    [<ffffffff81047ad0>] ? __kthread_parkme+0x68/0x68
    [<ffffffff813c39fc>] ret_from_fork+0x7c/0xb0
    [<ffffffff81047ad0>] ? __kthread_parkme+0x68/0x68


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