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Message-ID: <20081124172204.GA11971@elte.hu>
Date: Mon, 24 Nov 2008 18:22:04 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Rusty Russell <rusty@...tcorp.com.au>
Cc: Mike Travis <travis@....com>, linux-kernel@...r.kernel.org,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PULL] cpumask conversion patches for sched
* Ingo Molnar <mingo@...e.hu> wrote:
> Based on these good test results i've also integrated a new
> cpus4096-next tree and pushed it out for linux-next pickup.
... and exactly one minute after i sent that mail, -tip testing found
a CPU hotplug lockdep splat, introduced by your patches:
[ INFO: hard-safe -> hard-unsafe lock order detected ]
see the full splat below. Reproducer is:
echo 0 > /sys/devices/system/cpu/cpu1/online
sleep 1
echo 1 > /sys/devices/system/cpu/cpu1/online
sleep 1
echo 0 > /sys/devices/system/cpu/cpu1/online
sleep 1
echo 1 > /sys/devices/system/cpu/cpu1/online
config attached. I've excluded the topic for now.
Ingo
-------------->
CPU 1 is now offline
lockdep: fixing up alternatives.
SMP alternatives: switching to UP code
======================================================
[ INFO: hard-safe -> hard-unsafe lock order detected ]
2.6.28-rc6-tip-00766-g9f03358-dirty #1566
------------------------------------------------------
S99local/3134 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
(&p->alloc_lock){--..}, at: [<c01883e7>] cpuset_cpus_allowed_locked+0x27/0x50
and this task is already holding:
(&rq->lock){++..}, at: [<c0140384>] task_rq_lock+0x54/0x90
which would create a new lock dependency:
(&rq->lock){++..} -> (&p->alloc_lock){--..}
but this new dependency connects a hard-irq-safe lock:
(&rq->lock){++..}
... which became hard-irq-safe at:
[<c0173d9e>] __lock_acquire+0x9be/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c014c465>] scheduler_tick+0x45/0x1c0
[<c0159462>] update_process_times+0x52/0x70
[<c016dd0a>] tick_periodic+0x2a/0x80
[<c016dd7e>] tick_handle_periodic+0x1e/0x80
[<c011ef15>] timer_interrupt+0x35/0x80
[<c018ece0>] handle_IRQ_event+0x30/0x70
[<c0190955>] handle_level_irq+0x75/0xe0
[<ffffffff>] 0xffffffff
to a hard-irq-unsafe lock:
(&p->alloc_lock){--..}
... which became hard-irq-unsafe at:
... [<c0173c51>] __lock_acquire+0x871/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c01c7707>] set_task_comm+0x27/0x60
[<c0163f01>] kthreadd+0x21/0x160
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
other info that might help us debug this:
6 locks held by S99local/3134:
#0: (&buffer->mutex){--..}, at: [<c02025ef>] sysfs_write_file+0x2f/0x110
#1: (cpu_add_remove_lock){--..}, at: [<c0150af4>] cpu_maps_update_begin+0x14/0x20
#2: (&cpu_hotplug.lock){--..}, at: [<c0150b5f>] cpu_hotplug_begin+0x1f/0x50
#3: (callback_mutex){--..}, at: [<c0187cd4>] cpuset_lock+0x14/0x20
#4: (tasklist_lock){..--}, at: [<c0921bda>] migration_call+0x1da/0x4a0
#5: (&rq->lock){++..}, at: [<c0140384>] task_rq_lock+0x54/0x90
the hard-irq-safe lock's dependencies:
-> (&rq->lock){++..} ops: 143281 {
initial-use at:
[<c017359d>] __lock_acquire+0x1bd/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925908>] _spin_lock_irqsave+0x58/0x70
[<c014332d>] rq_attach_root+0x1d/0xb0
[<c0ce8fa7>] sched_init+0x327/0x4a0
[<c0cd2694>] start_kernel+0x154/0x360
[<c0cd2066>] i386_start_kernel+0x66/0x70
[<ffffffff>] 0xffffffff
in-hardirq-W at:
[<c0173d9e>] __lock_acquire+0x9be/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c014c465>] scheduler_tick+0x45/0x1c0
[<c0159462>] update_process_times+0x52/0x70
[<c016dd0a>] tick_periodic+0x2a/0x80
[<c016dd7e>] tick_handle_periodic+0x1e/0x80
[<c011ef15>] timer_interrupt+0x35/0x80
[<c018ece0>] handle_IRQ_event+0x30/0x70
[<c0190955>] handle_level_irq+0x75/0xe0
[<ffffffff>] 0xffffffff
in-softirq-W at:
[<c0173b46>] __lock_acquire+0x766/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925908>] _spin_lock_irqsave+0x58/0x70
[<c014782a>] tg_shares_up+0x13a/0x190
[<c013f9cb>] walk_tg_tree+0xab/0xe0
[<c0143416>] update_shares+0x56/0x70
[<c0149c6f>] rebalance_domains+0xff/0x440
[<c014a9a6>] run_rebalance_domains+0x36/0xc0
[<c01547b9>] __do_softirq+0xa9/0x180
[<ffffffff>] 0xffffffff
}
... key at: [<c0d7ff20>] __key.44534+0x0/0x8
-> (&vec->lock){.+..} ops: 859 {
initial-use at:
[<c017359d>] __lock_acquire+0x1bd/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925908>] _spin_lock_irqsave+0x58/0x70
[<c019f57f>] cpupri_set+0x7f/0xd0
[<c01425b0>] rq_online_rt+0x40/0x70
[<c013f4db>] set_rq_online+0x4b/0x60
[<c0143387>] rq_attach_root+0x77/0xb0
[<c0ce8fa7>] sched_init+0x327/0x4a0
[<c0cd2694>] start_kernel+0x154/0x360
[<c0cd2066>] i386_start_kernel+0x66/0x70
[<ffffffff>] 0xffffffff
in-softirq-W at:
[<c0173b46>] __lock_acquire+0x766/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925908>] _spin_lock_irqsave+0x58/0x70
[<c019f54c>] cpupri_set+0x4c/0xd0
[<c01481bb>] __enqueue_rt_entity+0xcb/0x200
[<c014835b>] enqueue_rt_entity+0x1b/0x30
[<c014839f>] enqueue_task_rt+0x2f/0x50
[<c013fd9c>] enqueue_task+0x5c/0x80
[<c013fddf>] activate_task+0x1f/0x30
[<c0147de8>] try_to_wake_up+0x248/0x2c0
[<c0147eb4>] wake_up_process+0x14/0x20
[<c0158fbd>] process_timeout+0xd/0x10
[<c0158dd1>] run_timer_softirq+0x181/0x1c0
[<c01547b9>] __do_softirq+0xa9/0x180
[<ffffffff>] 0xffffffff
}
... key at: [<c133c0f4>] __key.13648+0x0/0xc
... acquired at:
[<c017437a>] __lock_acquire+0xf9a/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925908>] _spin_lock_irqsave+0x58/0x70
[<c019f57f>] cpupri_set+0x7f/0xd0
[<c01425b0>] rq_online_rt+0x40/0x70
[<c013f4db>] set_rq_online+0x4b/0x60
[<c0143387>] rq_attach_root+0x77/0xb0
[<c0ce8fa7>] sched_init+0x327/0x4a0
[<c0cd2694>] start_kernel+0x154/0x360
[<c0cd2066>] i386_start_kernel+0x66/0x70
[<ffffffff>] 0xffffffff
-> (&rt_b->rt_runtime_lock){.+..} ops: 24 {
initial-use at:
[<c017359d>] __lock_acquire+0x1bd/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c014822c>] __enqueue_rt_entity+0x13c/0x200
[<c014835b>] enqueue_rt_entity+0x1b/0x30
[<c014839f>] enqueue_task_rt+0x2f/0x50
[<c013fd9c>] enqueue_task+0x5c/0x80
[<c013fddf>] activate_task+0x1f/0x30
[<c0147de8>] try_to_wake_up+0x248/0x2c0
[<c0147eb4>] wake_up_process+0x14/0x20
[<c0921a90>] migration_call+0x90/0x4a0
[<c0ce9158>] migration_init+0x38/0x50
[<c010111f>] do_one_initcall+0x2f/0x170
[<c0cd294a>] kernel_init+0x5a/0x170
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
in-softirq-W at:
[<c0173b46>] __lock_acquire+0x766/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c014822c>] __enqueue_rt_entity+0x13c/0x200
[<c014835b>] enqueue_rt_entity+0x1b/0x30
[<c014839f>] enqueue_task_rt+0x2f/0x50
[<c013fd9c>] enqueue_task+0x5c/0x80
[<c013fddf>] activate_task+0x1f/0x30
[<c0147de8>] try_to_wake_up+0x248/0x2c0
[<c0147eb4>] wake_up_process+0x14/0x20
[<c0149f6d>] rebalance_domains+0x3fd/0x440
[<c014a9a6>] run_rebalance_domains+0x36/0xc0
[<c01547b9>] __do_softirq+0xa9/0x180
[<ffffffff>] 0xffffffff
}
... key at: [<c0d7ff10>] __key.35881+0x0/0x8
-> (&cpu_base->lock){++..} ops: 25602 {
initial-use at:
[<c017359d>] __lock_acquire+0x1bd/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925897>] _spin_lock_irq+0x47/0x60
[<c0167286>] run_hrtimer_pending+0x16/0x150
[<c0167b21>] hrtimer_run_pending+0x71/0x160
[<c0158c72>] run_timer_softirq+0x22/0x1c0
[<c01547b9>] __do_softirq+0xa9/0x180
[<ffffffff>] 0xffffffff
in-hardirq-W at:
[<c0173d9e>] __lock_acquire+0x9be/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c0167d09>] hrtimer_run_queues+0xf9/0x1a0
[<c01590cd>] run_local_timers+0xd/0x20
[<c0159444>] update_process_times+0x34/0x70
[<c016dd0a>] tick_periodic+0x2a/0x80
[<c016dd7e>] tick_handle_periodic+0x1e/0x80
[<c012fd0b>] smp_apic_timer_interrupt+0x5b/0x90
[<c011cbe1>] apic_timer_interrupt+0x2d/0x34
[<c01507b0>] printk+0x20/0x30
[<c0101201>] do_one_initcall+0x111/0x170
[<c0cd294a>] kernel_init+0x5a/0x170
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
in-softirq-W at:
[<c0173b46>] __lock_acquire+0x766/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925897>] _spin_lock_irq+0x47/0x60
[<c0167286>] run_hrtimer_pending+0x16/0x150
[<c0167b21>] hrtimer_run_pending+0x71/0x160
[<c0158c72>] run_timer_softirq+0x22/0x1c0
[<c01547b9>] __do_softirq+0xa9/0x180
[<ffffffff>] 0xffffffff
}
... key at: [<c0f82ed8>] __key.20177+0x0/0x8
... acquired at:
[<c017437a>] __lock_acquire+0xf9a/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925908>] _spin_lock_irqsave+0x58/0x70
[<c0167618>] lock_hrtimer_base+0x28/0x50
[<c01676ae>] hrtimer_start_range_ns+0x1e/0x180
[<c0148273>] __enqueue_rt_entity+0x183/0x200
[<c014835b>] enqueue_rt_entity+0x1b/0x30
[<c014839f>] enqueue_task_rt+0x2f/0x50
[<c013fd9c>] enqueue_task+0x5c/0x80
[<c013fddf>] activate_task+0x1f/0x30
[<c0147de8>] try_to_wake_up+0x248/0x2c0
[<c0147eb4>] wake_up_process+0x14/0x20
[<c0921a90>] migration_call+0x90/0x4a0
[<c0ce9158>] migration_init+0x38/0x50
[<c010111f>] do_one_initcall+0x2f/0x170
[<c0cd294a>] kernel_init+0x5a/0x170
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
-> (&rt_rq->rt_runtime_lock){+...} ops: 458 {
initial-use at:
[<c017359d>] __lock_acquire+0x1bd/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c014ada9>] update_curr_rt+0x169/0x250
[<c014afbb>] dequeue_task_rt+0x1b/0x40
[<c0140100>] dequeue_task+0xe0/0x130
[<c014016f>] deactivate_task+0x1f/0x30
[<c092388b>] schedule+0x49b/0x8c0
[<c014a585>] migration_thread+0x155/0x250
[<c0163ea7>] kthread+0x47/0x80
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
in-hardirq-W at:
[<c0173d9e>] __lock_acquire+0x9be/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c014b103>] sched_rt_period_timer+0x123/0x280
[<c01674ec>] __run_hrtimer+0x9c/0xb0
[<c0167d87>] hrtimer_run_queues+0x177/0x1a0
[<c01590cd>] run_local_timers+0xd/0x20
[<c0159444>] update_process_times+0x34/0x70
[<c016dd0a>] tick_periodic+0x2a/0x80
[<c016dd7e>] tick_handle_periodic+0x1e/0x80
[<c012fd0b>] smp_apic_timer_interrupt+0x5b/0x90
[<c011cbe1>] apic_timer_interrupt+0x2d/0x34
[<c01507b0>] printk+0x20/0x30
[<c0101226>] do_one_initcall+0x136/0x170
[<c0cd2a02>] kernel_init+0x112/0x170
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
}
... key at: [<c0d7ff18>] __key.44461+0x0/0x8
... acquired at:
[<c017437a>] __lock_acquire+0xf9a/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c0142474>] __enable_runtime+0x64/0xd0
[<c0142596>] rq_online_rt+0x26/0x70
[<c013f4db>] set_rq_online+0x4b/0x60
[<c0921abe>] migration_call+0xbe/0x4a0
[<c0168c8b>] notifier_call_chain+0x4b/0x70
[<c0168d6e>] __raw_notifier_call_chain+0x1e/0x30
[<c0168d9f>] raw_notifier_call_chain+0x1f/0x30
[<c0921fb0>] _cpu_up+0xb0/0x100
[<c092204d>] cpu_up+0x4d/0x70
[<c0cd29a0>] kernel_init+0xb0/0x170
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
... acquired at:
[<c017437a>] __lock_acquire+0xf9a/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c014822c>] __enqueue_rt_entity+0x13c/0x200
[<c014835b>] enqueue_rt_entity+0x1b/0x30
[<c014839f>] enqueue_task_rt+0x2f/0x50
[<c013fd9c>] enqueue_task+0x5c/0x80
[<c013fddf>] activate_task+0x1f/0x30
[<c0147de8>] try_to_wake_up+0x248/0x2c0
[<c0147eb4>] wake_up_process+0x14/0x20
[<c0921a90>] migration_call+0x90/0x4a0
[<c0ce9158>] migration_init+0x38/0x50
[<c010111f>] do_one_initcall+0x2f/0x170
[<c0cd294a>] kernel_init+0x5a/0x170
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
... acquired at:
[<c017437a>] __lock_acquire+0xf9a/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c014ada9>] update_curr_rt+0x169/0x250
[<c014afbb>] dequeue_task_rt+0x1b/0x40
[<c0140100>] dequeue_task+0xe0/0x130
[<c014016f>] deactivate_task+0x1f/0x30
[<c092388b>] schedule+0x49b/0x8c0
[<c014a585>] migration_thread+0x155/0x250
[<c0163ea7>] kthread+0x47/0x80
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
-> (&rq->lock/1){.+..} ops: 617 {
initial-use at:
[<c017359d>] __lock_acquire+0x1bd/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925796>] _spin_lock_nested+0x36/0x50
[<c0147ab6>] double_rq_lock+0x76/0x90
[<c0149d02>] rebalance_domains+0x192/0x440
[<c014a9a6>] run_rebalance_domains+0x36/0xc0
[<c01547b9>] __do_softirq+0xa9/0x180
[<ffffffff>] 0xffffffff
in-softirq-W at:
[<c0173b46>] __lock_acquire+0x766/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925796>] _spin_lock_nested+0x36/0x50
[<c0147ab6>] double_rq_lock+0x76/0x90
[<c0149d02>] rebalance_domains+0x192/0x440
[<c014a9a6>] run_rebalance_domains+0x36/0xc0
[<c01547b9>] __do_softirq+0xa9/0x180
[<ffffffff>] 0xffffffff
}
... key at: [<c0d7ff21>] __key.44534+0x1/0x8
... acquired at:
[<c017437a>] __lock_acquire+0xf9a/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925796>] _spin_lock_nested+0x36/0x50
[<c0147ab6>] double_rq_lock+0x76/0x90
[<c0149d02>] rebalance_domains+0x192/0x440
[<c014a9a6>] run_rebalance_domains+0x36/0xc0
[<c01547b9>] __do_softirq+0xa9/0x180
[<ffffffff>] 0xffffffff
-> (&cpu_buffer->reader_lock){.+..} ops: 5064 {
initial-use at:
[<c017359d>] __lock_acquire+0x1bd/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925908>] _spin_lock_irqsave+0x58/0x70
[<c019920d>] ring_buffer_reset_cpu+0x2d/0x60
[<c019b00a>] tracing_reset+0x1a/0x30
[<c019b0dd>] register_tracer+0xbd/0x1b0
[<c0cec253>] tracer_alloc_buffers+0xd3/0x140
[<c010111f>] do_one_initcall+0x2f/0x170
[<c0cd294a>] kernel_init+0x5a/0x170
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
in-softirq-W at:
[<c0173b46>] __lock_acquire+0x766/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925908>] _spin_lock_irqsave+0x58/0x70
[<c019920d>] ring_buffer_reset_cpu+0x2d/0x60
[<c019b00a>] tracing_reset+0x1a/0x30
[<c019e7e9>] __wakeup_reset+0x19/0x80
[<c019ecf5>] probe_wakeup+0xb5/0x150
[<c0147e50>] try_to_wake_up+0x2b0/0x2c0
[<c0147eb4>] wake_up_process+0x14/0x20
[<c0158fbd>] process_timeout+0xd/0x10
[<c0158dd1>] run_timer_softirq+0x181/0x1c0
[<c01547b9>] __do_softirq+0xa9/0x180
[<ffffffff>] 0xffffffff
}
... key at: [<c1319940>] __key.21839+0x0/0x20
... acquired at:
[<c017437a>] __lock_acquire+0xf9a/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c0925908>] _spin_lock_irqsave+0x58/0x70
[<c019920d>] ring_buffer_reset_cpu+0x2d/0x60
[<c019b00a>] tracing_reset+0x1a/0x30
[<c019e7e9>] __wakeup_reset+0x19/0x80
[<c019ecf5>] probe_wakeup+0xb5/0x150
[<c0147e50>] try_to_wake_up+0x2b0/0x2c0
[<c0147eb4>] wake_up_process+0x14/0x20
[<c019baeb>] trace_selftest_startup_wakeup+0xab/0x160
[<c019b117>] register_tracer+0xf7/0x1b0
[<c0cec2fd>] init_wakeup_tracer+0xd/0x10
[<c010111f>] do_one_initcall+0x2f/0x170
[<c0cd2a02>] kernel_init+0x112/0x170
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
the hard-irq-unsafe lock's dependencies:
-> (&p->alloc_lock){--..} ops: 21231 {
initial-use at:
[<c017359d>] __lock_acquire+0x1bd/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c01c7707>] set_task_comm+0x27/0x60
[<c0163f01>] kthreadd+0x21/0x160
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
softirq-on-W at:
[<c0173c77>] __lock_acquire+0x897/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c01c7707>] set_task_comm+0x27/0x60
[<c0163f01>] kthreadd+0x21/0x160
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
hardirq-on-W at:
[<c0173c51>] __lock_acquire+0x871/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c09257e8>] _spin_lock+0x38/0x50
[<c01c7707>] set_task_comm+0x27/0x60
[<c0163f01>] kthreadd+0x21/0x160
[<c011cd0b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
}
... key at: [<c0d80ea0>] __key.38217+0x0/0x8
stack backtrace:
Pid: 3134, comm: S99local Not tainted 2.6.28-rc6-tip-00766-g9f03358-dirty #1566
Call Trace:
[<c0172a18>] check_usage+0x2e8/0x340
[<c0174090>] __lock_acquire+0xcb0/0x1380
[<c01747e9>] lock_acquire+0x89/0xc0
[<c01883e7>] ? cpuset_cpus_allowed_locked+0x27/0x50
[<c09257e8>] _spin_lock+0x38/0x50
[<c01883e7>] ? cpuset_cpus_allowed_locked+0x27/0x50
[<c01883e7>] cpuset_cpus_allowed_locked+0x27/0x50
[<c0148de2>] move_task_off_dead_cpu+0xc2/0x140
[<c0921c27>] migration_call+0x227/0x4a0
[<c017507b>] ? trace_hardirqs_on+0xb/0x10
[<c0926e85>] ? _etext+0x0/0xb
[<c0168c8b>] notifier_call_chain+0x4b/0x70
[<c0168d6e>] __raw_notifier_call_chain+0x1e/0x30
[<c0168d9f>] raw_notifier_call_chain+0x1f/0x30
[<c08e7a59>] _cpu_down+0x129/0x260
[<c0161eb2>] ? synchronize_rcu+0x32/0x40
[<c0161d80>] ? wakeme_after_rcu+0x0/0x20
[<c08e7be6>] cpu_down+0x56/0x70
[<c08e940c>] store_online+0x3c/0x80
[<c08e93d0>] ? store_online+0x0/0x80
[<c051b64a>] sysdev_store+0x2a/0x40
[<c020267e>] sysfs_write_file+0xbe/0x110
[<c01c3bbb>] vfs_write+0x9b/0x130
[<c02025c0>] ? sysfs_write_file+0x0/0x110
[<c01c3d12>] sys_write+0x42/0x70
[<c011c46f>] sysenter_do_call+0x12/0x43
CPU0 attaching NULL sched-domain.
CPU1 attaching NULL sched-domain.
CPU0 attaching NULL sched-domain.
lockdep: fixing up alternatives.
SMP alternatives: switching to SMP code
CPU 1 irqstacks, hard=c0d64000 soft=c0d5c000
View attachment "config" of type "text/plain" (65553 bytes)
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