Re: [patch 00/61] ANNOUNCE: lock validator -V1

From: Benoit Boissinot
Date: Tue May 30 2006 - 05:14:37 EST

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On 5/29/06, Ingo Molnar <mingo@xxxxxxx> wrote:

We are pleased to announce the first release of the "lock dependency
correctness validator" kernel debugging feature, which can be downloaded
from:

http://redhat.com/~mingo/lockdep-patches/
[snip]

I get this right after ipw2200 is loaded (it is quite verbose, I
probably shoudln't post everything...)

ipw2200: Detected Intel PRO/Wireless 2200BG Network Connection
ipw2200: Detected geography ZZD (13 802.11bg channels, 0 802.11a channels)

======================================================
[ BUG: hard-safe -> hard-unsafe lock order detected! ]
------------------------------------------------------
default.hotplug/3212 [HC0[0]:SC1[1]:HE0:SE0] is trying to acquire:
(nl_table_lock){-.-±}, at: [<c0301efa>] netlink_broadcast+0x7a/0x360

and this task is already holding:
(&priv->lock){++..}, at: [<e1cfe588>] ipw_irq_tasklet+0x18/0x500 [ipw2200]
which would create a new lock dependency:
(&priv->lock){++..} -> (nl_table_lock){-.-±}

but this new dependency connects a hard-irq-safe lock:
(&priv->lock){++..}
... which became hard-irq-safe at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<e1cfdbc1>] ipw_isr+0x21/0xd0 [ipw2200]
[<c01466e3>] handle_IRQ_event+0x33/0x80
[<c01467e4>] __do_IRQ+0xb4/0x120
[<c01057c0>] do_IRQ+0x70/0xc0

to a hard-irq-unsafe lock:
(nl_table_lock){-.-±}
... which became hard-irq-unsafe at:
... [<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03520da>] _write_lock_bh+0x2a/0x30
[<c03017d2>] netlink_table_grab+0x12/0xe0
[<c0301bcb>] netlink_insert+0x2b/0x180
[<c030307c>] netlink_kernel_create+0xac/0x140
[<c048f29a>] rtnetlink_init+0x6a/0xc0
[<c048f6b9>] netlink_proto_init+0x169/0x180
[<c010029f>] _stext+0x7f/0x250
[<c0101005>] kernel_thread_helper+0x5/0xb

which could potentially lead to deadlocks!

other info that might help us debug this:

1 locks held by default.hotplug/3212:
#0: (&priv->lock){++..}, at: [<e1cfe588>] ipw_irq_tasklet+0x18/0x500 [ipw2200]

the hard-irq-safe lock's dependencies:
-> (&priv->lock){++..} ops: 102 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<e1cf6a0c>] ipw_load+0x1fc/0xc90 [ipw2200]
[<e1cf74e8>] ipw_up+0x48/0x520 [ipw2200]
[<e1cfda87>] ipw_net_init+0x27/0x50 [ipw2200]
[<c02eeef1>] register_netdevice+0xd1/0x410
[<c02f0609>] register_netdev+0x59/0x70
[<e1cfe4d6>] ipw_pci_probe+0x806/0x8a0 [ipw2200]
[<c023481e>] pci_device_probe+0x5e/0x80
[<c02a86e4>] driver_probe_device+0x44/0xc0
[<c02a888b>] __driver_attach+0x9b/0xa0
[<c02a8039>] bus_for_each_dev+0x49/0x70
[<c02a8629>] driver_attach+0x19/0x20
[<c02a7c64>] bus_add_driver+0x74/0x140
[<c02a8b06>] driver_register+0x56/0x90
[<c0234a10>] __pci_register_driver+0x50/0x70
[<e18b302e>] 0xe18b302e
[<c014034d>] sys_init_module+0xcd/0x1630
[<c035273b>] sysenter_past_esp+0x54/0x8d
in-hardirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<e1cfdbc1>] ipw_isr+0x21/0xd0 [ipw2200]
[<c01466e3>] handle_IRQ_event+0x33/0x80
[<c01467e4>] __do_IRQ+0xb4/0x120
[<c01057c0>] do_IRQ+0x70/0xc0
in-softirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<e1cfe588>] ipw_irq_tasklet+0x18/0x500 [ipw2200]
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
}
... key at: [<e1d0b438>] __key.27363+0x0/0xffff38f6 [ipw2200]
-> (&q->lock){++..} ops: 33353 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352509>] _spin_lock_irq+0x29/0x40
[<c034f084>] wait_for_completion+0x24/0x150
[<c013160e>] keventd_create_kthread+0x2e/0x70
[<c01315d6>] kthread_create+0xe6/0xf0
[<c0121b75>] cpu_callback+0x95/0x110
[<c0481194>] spawn_ksoftirqd+0x14/0x30
[<c010023c>] _stext+0x1c/0x250
[<c0101005>] kernel_thread_helper+0x5/0xb
in-hardirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c011794b>] __wake_up+0x1b/0x50
[<c012dcdd>] __queue_work+0x4d/0x70
[<c012ddaf>] queue_work+0x6f/0x80
[<c0269588>] acpi_os_execute+0xcd/0xe9
[<c026eea1>] acpi_ev_gpe_dispatch+0xbc/0x122
[<c026f106>] acpi_ev_gpe_detect+0x99/0xe0
[<c026d90b>] acpi_ev_sci_xrupt_handler+0x15/0x1d
[<c0268c55>] acpi_irq+0xe/0x18
[<c01466e3>] handle_IRQ_event+0x33/0x80
[<c01467e4>] __do_IRQ+0xb4/0x120
[<c01057c0>] do_IRQ+0x70/0xc0
in-softirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c011786b>] complete+0x1b/0x60
[<c012ef0b>] wakeme_after_rcu+0xb/0x10
[<c012f0c9>] __rcu_process_callbacks+0x69/0x1c0
[<c012f232>] rcu_process_callbacks+0x12/0x30
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
}
... key at: [<c04d47c8>] 0xc04d47c8
-> (&rq->lock){++..} ops: 68824 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c0117bcc>] init_idle+0x4c/0x80
[<c0480ad8>] sched_init+0xa8/0xb0
[<c0473558>] start_kernel+0x58/0x330
[<c0100199>] 0xc0100199
in-hardirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<c0117cc7>] scheduler_tick+0xc7/0x310
[<c01270ee>] update_process_times+0x3e/0x70
[<c0106c21>] timer_interrupt+0x41/0xa0
[<c01466e3>] handle_IRQ_event+0x33/0x80
[<c01467e4>] __do_IRQ+0xb4/0x120
[<c01057c0>] do_IRQ+0x70/0xc0
in-softirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<c01183e0>] try_to_wake_up+0x30/0x170
[<c011854f>] wake_up_process+0xf/0x20
[<c0122413>] __do_softirq+0xb3/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
}
... key at: [<c04c1400>] 0xc04c1400
... acquired at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<c01183e0>] try_to_wake_up+0x30/0x170
[<c011852b>] default_wake_function+0xb/0x10
[<c01172d9>] __wake_up_common+0x39/0x70
[<c011788d>] complete+0x3d/0x60
[<c01316d4>] kthread+0x84/0xbc
[<c0101005>] kernel_thread_helper+0x5/0xb

... acquired at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c011794b>] __wake_up+0x1b/0x50
[<e1cf6a2e>] ipw_load+0x21e/0xc90 [ipw2200]
[<e1cf74e8>] ipw_up+0x48/0x520 [ipw2200]
[<e1cfda87>] ipw_net_init+0x27/0x50 [ipw2200]
[<c02eeef1>] register_netdevice+0xd1/0x410
[<c02f0609>] register_netdev+0x59/0x70
[<e1cfe4d6>] ipw_pci_probe+0x806/0x8a0 [ipw2200]
[<c023481e>] pci_device_probe+0x5e/0x80
[<c02a86e4>] driver_probe_device+0x44/0xc0
[<c02a888b>] __driver_attach+0x9b/0xa0
[<c02a8039>] bus_for_each_dev+0x49/0x70
[<c02a8629>] driver_attach+0x19/0x20
[<c02a7c64>] bus_add_driver+0x74/0x140
[<c02a8b06>] driver_register+0x56/0x90
[<c0234a10>] __pci_register_driver+0x50/0x70
[<e18b302e>] 0xe18b302e
[<c014034d>] sys_init_module+0xcd/0x1630
[<c035273b>] sysenter_past_esp+0x54/0x8d

-> (&rxq->lock){.+..} ops: 40 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<e1cf66d0>] ipw_rx_queue_replenish+0x20/0x120 [ipw2200]
[<e1cf72e0>] ipw_load+0xad0/0xc90 [ipw2200]
[<e1cf74e8>] ipw_up+0x48/0x520 [ipw2200]
[<e1cfda87>] ipw_net_init+0x27/0x50 [ipw2200]
[<c02eeef1>] register_netdevice+0xd1/0x410
[<c02f0609>] register_netdev+0x59/0x70
[<e1cfe4d6>] ipw_pci_probe+0x806/0x8a0 [ipw2200]
[<c023481e>] pci_device_probe+0x5e/0x80
[<c02a86e4>] driver_probe_device+0x44/0xc0
[<c02a888b>] __driver_attach+0x9b/0xa0
[<c02a8039>] bus_for_each_dev+0x49/0x70
[<c02a8629>] driver_attach+0x19/0x20
[<c02a7c64>] bus_add_driver+0x74/0x140
[<c02a8b06>] driver_register+0x56/0x90
[<c0234a10>] __pci_register_driver+0x50/0x70
[<e18b302e>] 0xe18b302e
[<c014034d>] sys_init_module+0xcd/0x1630
[<c035273b>] sysenter_past_esp+0x54/0x8d
in-softirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<e1cf25bf>] ipw_rx_queue_restock+0x1f/0x120 [ipw2200]
[<e1cf80d1>] ipw_rx+0x631/0x1bb0 [ipw2200]
[<e1cfe6ac>] ipw_irq_tasklet+0x13c/0x500 [ipw2200]
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
}
... key at: [<e1d0b440>] __key.23915+0x0/0xffff38ee [ipw2200]
-> (&parent->list_lock){.+..} ops: 17457 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<c0166437>] cache_alloc_refill+0x87/0x650
[<c0166bae>] kmem_cache_zalloc+0xbe/0xd0
[<c01672d4>] kmem_cache_create+0x154/0x540
[<c0483ad9>] kmem_cache_init+0x179/0x3d0
[<c0473638>] start_kernel+0x138/0x330
[<c0100199>] 0xc0100199
in-softirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<c0166073>] free_block+0x183/0x190
[<c0165bdf>] __cache_free+0x9f/0x120
[<c0165da8>] kmem_cache_free+0x88/0xb0
[<c0119e21>] free_task+0x21/0x30
[<c011b955>] __put_task_struct+0x95/0x156
[<c011db12>] delayed_put_task_struct+0x32/0x60
[<c012f0c9>] __rcu_process_callbacks+0x69/0x1c0
[<c012f232>] rcu_process_callbacks+0x12/0x30
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
}
... key at: [<c060d00c>] 0xc060d00c
... acquired at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<c0166437>] cache_alloc_refill+0x87/0x650
[<c0166ab8>] __kmalloc+0xb8/0xf0
[<c02eb3cb>] __alloc_skb+0x4b/0x100
[<e1cf6769>] ipw_rx_queue_replenish+0xb9/0x120 [ipw2200]
[<e1cf72e0>] ipw_load+0xad0/0xc90 [ipw2200]
[<e1cf74e8>] ipw_up+0x48/0x520 [ipw2200]
[<e1cfda87>] ipw_net_init+0x27/0x50 [ipw2200]
[<c02eeef1>] register_netdevice+0xd1/0x410
[<c02f0609>] register_netdev+0x59/0x70
[<e1cfe4d6>] ipw_pci_probe+0x806/0x8a0 [ipw2200]
[<c023481e>] pci_device_probe+0x5e/0x80
[<c02a86e4>] driver_probe_device+0x44/0xc0
[<c02a888b>] __driver_attach+0x9b/0xa0
[<c02a8039>] bus_for_each_dev+0x49/0x70
[<c02a8629>] driver_attach+0x19/0x20
[<c02a7c64>] bus_add_driver+0x74/0x140
[<c02a8b06>] driver_register+0x56/0x90
[<c0234a10>] __pci_register_driver+0x50/0x70
[<e18b302e>] 0xe18b302e
[<c014034d>] sys_init_module+0xcd/0x1630
[<c035273b>] sysenter_past_esp+0x54/0x8d

... acquired at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<e1cf25bf>] ipw_rx_queue_restock+0x1f/0x120 [ipw2200]
[<e1cf80d1>] ipw_rx+0x631/0x1bb0 [ipw2200]
[<e1cfe6ac>] ipw_irq_tasklet+0x13c/0x500 [ipw2200]
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0

-> (&ieee->lock){.+..} ops: 15 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<e1c9d0cf>] ieee80211_process_probe_response+0x1ff/0x790 [ieee80211]
[<e1c9d70f>] ieee80211_rx_mgt+0xaf/0x340 [ieee80211]
[<e1cf8219>] ipw_rx+0x779/0x1bb0 [ipw2200]
[<e1cfe6ac>] ipw_irq_tasklet+0x13c/0x500 [ipw2200]
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
in-softirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<e1c9d0cf>] ieee80211_process_probe_response+0x1ff/0x790 [ieee80211]
[<e1c9d70f>] ieee80211_rx_mgt+0xaf/0x340 [ieee80211]
[<e1cf8219>] ipw_rx+0x779/0x1bb0 [ipw2200]
[<e1cfe6ac>] ipw_irq_tasklet+0x13c/0x500 [ipw2200]
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
}
... key at: [<e1ca2781>] __key.22782+0x0/0xffffdc00 [ieee80211]
... acquired at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<e1c9d0cf>] ieee80211_process_probe_response+0x1ff/0x790 [ieee80211]
[<e1c9d70f>] ieee80211_rx_mgt+0xaf/0x340 [ieee80211]
[<e1cf8219>] ipw_rx+0x779/0x1bb0 [ipw2200]
[<e1cfe6ac>] ipw_irq_tasklet+0x13c/0x500 [ipw2200]
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0

-> (&cwq->lock){++..} ops: 3739 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c012dca8>] __queue_work+0x18/0x70
[<c012ddaf>] queue_work+0x6f/0x80
[<c012d949>] call_usermodehelper_keys+0x139/0x160
[<c0219a2a>] kobject_uevent+0x7a/0x4a0
[<c0219753>] kobject_register+0x43/0x50
[<c02a7687>] sysdev_register+0x67/0x100
[<c02aa950>] register_cpu+0x30/0x70
[<c0108f7a>] arch_register_cpu+0x2a/0x30
[<c047850a>] topology_init+0xa/0x10
[<c010029f>] _stext+0x7f/0x250
[<c0101005>] kernel_thread_helper+0x5/0xb
in-hardirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c012dca8>] __queue_work+0x18/0x70
[<c012ddaf>] queue_work+0x6f/0x80
[<c0269588>] acpi_os_execute+0xcd/0xe9
[<c026eea1>] acpi_ev_gpe_dispatch+0xbc/0x122
[<c026f106>] acpi_ev_gpe_detect+0x99/0xe0
[<c026d90b>] acpi_ev_sci_xrupt_handler+0x15/0x1d
[<c0268c55>] acpi_irq+0xe/0x18
[<c01466e3>] handle_IRQ_event+0x33/0x80
[<c01467e4>] __do_IRQ+0xb4/0x120
[<c01057c0>] do_IRQ+0x70/0xc0
in-softirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c012dca8>] __queue_work+0x18/0x70
[<c012dd30>] delayed_work_timer_fn+0x30/0x40
[<c012633e>] run_timer_softirq+0x12e/0x180
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
}
... key at: [<c04d4334>] 0xc04d4334
-> (&q->lock){++..} ops: 33353 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352509>] _spin_lock_irq+0x29/0x40
[<c034f084>] wait_for_completion+0x24/0x150
[<c013160e>] keventd_create_kthread+0x2e/0x70
[<c01315d6>] kthread_create+0xe6/0xf0
[<c0121b75>] cpu_callback+0x95/0x110
[<c0481194>] spawn_ksoftirqd+0x14/0x30
[<c010023c>] _stext+0x1c/0x250
[<c0101005>] kernel_thread_helper+0x5/0xb
in-hardirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c011794b>] __wake_up+0x1b/0x50
[<c012dcdd>] __queue_work+0x4d/0x70
[<c012ddaf>] queue_work+0x6f/0x80
[<c0269588>] acpi_os_execute+0xcd/0xe9
[<c026eea1>] acpi_ev_gpe_dispatch+0xbc/0x122
[<c026f106>] acpi_ev_gpe_detect+0x99/0xe0
[<c026d90b>] acpi_ev_sci_xrupt_handler+0x15/0x1d
[<c0268c55>] acpi_irq+0xe/0x18
[<c01466e3>] handle_IRQ_event+0x33/0x80
[<c01467e4>] __do_IRQ+0xb4/0x120
[<c01057c0>] do_IRQ+0x70/0xc0
in-softirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c011786b>] complete+0x1b/0x60
[<c012ef0b>] wakeme_after_rcu+0xb/0x10
[<c012f0c9>] __rcu_process_callbacks+0x69/0x1c0
[<c012f232>] rcu_process_callbacks+0x12/0x30
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
}
... key at: [<c04d47c8>] 0xc04d47c8
-> (&rq->lock){++..} ops: 68824 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c0117bcc>] init_idle+0x4c/0x80
[<c0480ad8>] sched_init+0xa8/0xb0
[<c0473558>] start_kernel+0x58/0x330
[<c0100199>] 0xc0100199
in-hardirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<c0117cc7>] scheduler_tick+0xc7/0x310
[<c01270ee>] update_process_times+0x3e/0x70
[<c0106c21>] timer_interrupt+0x41/0xa0
[<c01466e3>] handle_IRQ_event+0x33/0x80
[<c01467e4>] __do_IRQ+0xb4/0x120
[<c01057c0>] do_IRQ+0x70/0xc0
in-softirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<c01183e0>] try_to_wake_up+0x30/0x170
[<c011854f>] wake_up_process+0xf/0x20
[<c0122413>] __do_softirq+0xb3/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
}
... key at: [<c04c1400>] 0xc04c1400
... acquired at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352583>] _spin_lock+0x23/0x30
[<c01183e0>] try_to_wake_up+0x30/0x170
[<c011852b>] default_wake_function+0xb/0x10
[<c01172d9>] __wake_up_common+0x39/0x70
[<c011788d>] complete+0x3d/0x60
[<c01316d4>] kthread+0x84/0xbc
[<c0101005>] kernel_thread_helper+0x5/0xb

... acquired at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c011794b>] __wake_up+0x1b/0x50
[<c012dcdd>] __queue_work+0x4d/0x70
[<c012ddaf>] queue_work+0x6f/0x80
[<c012d949>] call_usermodehelper_keys+0x139/0x160
[<c0219a2a>] kobject_uevent+0x7a/0x4a0
[<c0219753>] kobject_register+0x43/0x50
[<c02a7687>] sysdev_register+0x67/0x100
[<c02aa950>] register_cpu+0x30/0x70
[<c0108f7a>] arch_register_cpu+0x2a/0x30
[<c047850a>] topology_init+0xa/0x10
[<c010029f>] _stext+0x7f/0x250
[<c0101005>] kernel_thread_helper+0x5/0xb

... acquired at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c012dca8>] __queue_work+0x18/0x70
[<c012ddaf>] queue_work+0x6f/0x80
[<e1cf267e>] ipw_rx_queue_restock+0xde/0x120 [ipw2200]
[<e1cf80d1>] ipw_rx+0x631/0x1bb0 [ipw2200]
[<e1cfe6ac>] ipw_irq_tasklet+0x13c/0x500 [ipw2200]
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0

-> (&base->lock){++..} ops: 8140 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c0126e4a>] lock_timer_base+0x3a/0x60
[<c0126f17>] __mod_timer+0x37/0xc0
[<c0127036>] mod_timer+0x36/0x50
[<c048a2e5>] con_init+0x1b5/0x200
[<c0489802>] console_init+0x32/0x40
[<c04735ea>] start_kernel+0xea/0x330
[<c0100199>] 0xc0100199
in-hardirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c0126e4a>] lock_timer_base+0x3a/0x60
[<c0126e9c>] del_timer+0x2c/0x70
[<c02bc619>] ide_intr+0x69/0x1f0
[<c01466e3>] handle_IRQ_event+0x33/0x80
[<c01467e4>] __do_IRQ+0xb4/0x120
[<c01057c0>] do_IRQ+0x70/0xc0
in-softirq-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352509>] _spin_lock_irq+0x29/0x40
[<c0126239>] run_timer_softirq+0x29/0x180
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
}
... key at: [<c04d3af8>] 0xc04d3af8
... acquired at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03524c0>] _spin_lock_irqsave+0x30/0x50
[<c0126e4a>] lock_timer_base+0x3a/0x60
[<c0126e9c>] del_timer+0x2c/0x70
[<e1cf83d9>] ipw_rx+0x939/0x1bb0 [ipw2200]
[<e1cfe6ac>] ipw_irq_tasklet+0x13c/0x500 [ipw2200]
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0

the hard-irq-unsafe lock's dependencies:
-> (nl_table_lock){-.-±} ops: 1585 {
initial-use at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03520da>] _write_lock_bh+0x2a/0x30
[<c03017d2>] netlink_table_grab+0x12/0xe0
[<c0301bcb>] netlink_insert+0x2b/0x180
[<c030307c>] netlink_kernel_create+0xac/0x140
[<c048f29a>] rtnetlink_init+0x6a/0xc0
[<c048f6b9>] netlink_proto_init+0x169/0x180
[<c010029f>] _stext+0x7f/0x250
[<c0101005>] kernel_thread_helper+0x5/0xb
hardirq-on-W at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c03520da>] _write_lock_bh+0x2a/0x30
[<c03017d2>] netlink_table_grab+0x12/0xe0
[<c0301bcb>] netlink_insert+0x2b/0x180
[<c030307c>] netlink_kernel_create+0xac/0x140
[<c048f29a>] rtnetlink_init+0x6a/0xc0
[<c048f6b9>] netlink_proto_init+0x169/0x180
[<c010029f>] _stext+0x7f/0x250
[<c0101005>] kernel_thread_helper+0x5/0xb
in-softirq-R at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352130>] _read_lock+0x20/0x30
[<c0301efa>] netlink_broadcast+0x7a/0x360
[<c02fb6a4>] wireless_send_event+0x304/0x340
[<e1cf8e11>] ipw_rx+0x1371/0x1bb0 [ipw2200]
[<e1cfe6ac>] ipw_irq_tasklet+0x13c/0x500 [ipw2200]
[<c0121ea0>] tasklet_action+0x40/0x90
[<c01223b4>] __do_softirq+0x54/0xc0
[<c01056bb>] do_softirq+0x5b/0xf0
softirq-on-R at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352130>] _read_lock+0x20/0x30
[<c0301efa>] netlink_broadcast+0x7a/0x360
[<c02199f0>] kobject_uevent+0x40/0x4a0
[<c0219753>] kobject_register+0x43/0x50
[<c02a7687>] sysdev_register+0x67/0x100
[<c02aa950>] register_cpu+0x30/0x70
[<c0108f7a>] arch_register_cpu+0x2a/0x30
[<c047850a>] topology_init+0xa/0x10
[<c010029f>] _stext+0x7f/0x250
[<c0101005>] kernel_thread_helper+0x5/0xb
hardirq-on-R at:
[<c01395da>] lockdep_acquire+0x7a/0xa0
[<c0352130>] _read_lock+0x20/0x30
[<c0301efa>] netlink_broadcast+0x7a/0x360
[<c02199f0>] kobject_uevent+0x40/0x4a0
[<c0219753>] kobject_register+0x43/0x50
[<c02a7687>] sysdev_register+0x67/0x100
[<c02aa950>] register_cpu+0x30/0x70
[<c0108f7a>] arch_register_cpu+0x2a/0x30
[<c047850a>] topology_init+0xa/0x10
[<c010029f>] _stext+0x7f/0x250
[<c0101005>] kernel_thread_helper+0x5/0xb
}
... key at: [<c0438908>] 0xc0438908

stack backtrace:
<c010402d> show_trace+0xd/0x10 <c0104687> dump_stack+0x17/0x20
<c0137fe3> check_usage+0x263/0x270 <c0138f06> __lockdep_acquire+0xb96/0xd40
<c01395da> lockdep_acquire+0x7a/0xa0 <c0352130> _read_lock+0x20/0x30
<c0301efa> netlink_broadcast+0x7a/0x360 <c02fb6a4> wireless_send_event+0x304/0x340
<e1cf8e11> ipw_rx+0x1371/0x1bb0 [ipw2200] <e1cfe6ac> ipw_irq_tasklet+0x13c/0x500 [ipw2200]
<c0121ea0> tasklet_action+0x40/0x90 <c01223b4> __do_softirq+0x54/0xc0
<c01056bb> do_softirq+0x5b/0xf0 =======================
<c0122455> irq_exit+0x35/0x40 <c01057c7> do_IRQ+0x77/0xc0
<c0103949> common_interrupt+0x25/0x2c -
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