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    SubjectINFO: possible recursive locking detected: get_partial_node() on 3.2-rc1
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    (was '3.2-rc1: INFO: possible recursive locking detect')

    On Wednesday 09 November 2011 09:05:57 Yong Zhang wrote:
    >
    >Hi,
    >Just get below waring when doing:
    >for i in `seq 1 10`; do ./perf bench -f simple sched messaging -g 40; done

    >And kernel config is attached.

    >Thanks,
    >Yong

    >---
    >[ 350.148020] =============================================
    [ 350.148020] [ INFO: possible recursive locking detected ]
    [ 350.148020] 3.2.0-rc1-10791-g76a4b59-dirty #2
    [ 350.148020] ---------------------------------------------
    [ 350.148020] perf/9439 is trying to acquire lock:
    [ 350.148020] (&(&n->list_lock)->rlock){-.-...}, at: [<ffffffff8113847f>] get_partial_node+0x5f/0x360
    [ 350.148020]
    [ 350.148020] but task is already holding lock:
    [ 350.148020] (&(&n->list_lock)->rlock){-.-...}, at: [<ffffffff811380c9>] unfreeze_partials+0x199/0x3c0
    [ 350.148020]
    [ 350.148020] other info that might help us debug this:
    [ 350.148020] Possible unsafe locking scenario:
    [ 350.148020]
    [ 350.148020] CPU0
    [ 350.148020] ----
    [ 350.148020] lock(&(&n->list_lock)->rlock);
    [ 350.148020] lock(&(&n->list_lock)->rlock);
    [ 350.148020]
    [ 350.148020] *** DEADLOCK ***
    [ 350.148020]
    [ 350.148020] May be due to missing lock nesting notation
    [ 350.148020]
    [ 350.148020] 2 locks held by perf/9439:
    [ 350.148020] #0: (tasklist_lock){.+.+..}, at: [<ffffffff810552ee>] release_task+0x9e/0x500
    >[ 350.148020] #1: (&(&n->list_lock)->rlock){-.-...}, at: [<ffffffff811380c9>] unfreeze_partials+0x199/0x3c0


    Hi Yong

    I've been getting a similar report not when using perf though, just in my dmesg at startup:
    (if people want my .config please ask, I'm not including it else in case it's just unhelpful noise)

    Cheers
    Julie

    [ 34.545934] =============================================
    [ 34.545936] [ INFO: possible recursive locking detected ]
    [ 34.545939] 3.2.0-rc1 #103
    [ 34.545940] ---------------------------------------------
    [ 34.545943] kdeinit4/2559 is trying to acquire lock:
    [ 34.545945] (&(&n->list_lock)->rlock){-.-...}, at: [<ffffffff8110aaa4>] get_partial_node+0x3f/0x17a
    [ 34.545954]
    [ 34.545955] but task is already holding lock:
    [ 34.545957] (&(&n->list_lock)->rlock){-.-...}, at: [<ffffffff81109efe>] unfreeze_partials+0xc4/0x193
    [ 34.545963]
    [ 34.545964] other info that might help us debug this:
    [ 34.545966] Possible unsafe locking scenario:
    [ 34.545966]
    [ 34.545968] CPU0
    [ 34.545969] ----
    [ 34.545971] lock(&(&n->list_lock)->rlock);
    [ 34.545974] lock(&(&n->list_lock)->rlock);
    [ 34.545977]
    [ 34.545978] *** DEADLOCK ***
    [ 34.545978]
    [ 34.545980] May be due to missing lock nesting notation
    [ 34.545981]
    [ 34.545983] 1 lock held by kdeinit4/2559:
    [ 34.545985] #0: (&(&n->list_lock)->rlock){-.-...}, at: [<ffffffff81109efe>] unfreeze_partials+0xc4/0x193
    [ 34.545992]
    [ 34.545992] stack backtrace:
    [ 34.545995] Pid: 2559, comm: kdeinit4 Not tainted 3.2.0-rc1 #103
    [ 34.545997] Call Trace:
    [ 34.546003] [<ffffffff81076548>] __lock_acquire+0x9d8/0xdf7
    [ 34.546008] [<ffffffff8105fdf5>] ? __kernel_text_address+0x26/0x4c
    [ 34.546010] [<ffffffff81004c57>] ? print_context_stack+0x9c/0xb2
    [ 34.546010] [<ffffffff8110aaa4>] ? get_partial_node+0x3f/0x17a
    [ 34.546010] [<ffffffff81076e4a>] lock_acquire+0xd8/0xfe
    [ 34.546010] [<ffffffff8110aaa4>] ? get_partial_node+0x3f/0x17a
    [ 34.546010] [<ffffffff8107e092>] ? __module_text_address+0x12/0x5f
    [ 34.546010] [<ffffffff815af2d3>] _raw_spin_lock+0x45/0x7a
    [ 34.546010] [<ffffffff8110aaa4>] ? get_partial_node+0x3f/0x17a
    [ 34.546010] [<ffffffff8110aaa4>] get_partial_node+0x3f/0x17a
    [ 34.546010] [<ffffffff810733fb>] ? look_up_lock_class+0x5f/0xbe
    [ 34.546010] [<ffffffff8107e092>] ? __module_text_address+0x12/0x5f
    [ 34.546010] [<ffffffff8110ad4e>] __slab_alloc+0x16f/0x3ae
    [ 34.546010] [<ffffffff81008529>] ? native_sched_clock+0x3b/0x3d
    [ 34.546010] [<ffffffff81112d46>] ? create_object+0x39/0x283
    [ 34.546010] [<ffffffff81008529>] ? native_sched_clock+0x3b/0x3d
    [ 34.546010] [<ffffffff81072655>] ? arch_local_irq_save+0x9/0xc
    [ 34.546010] [<ffffffff81112d46>] ? create_object+0x39/0x283
    [ 34.546010] [<ffffffff8110c54c>] kmem_cache_alloc+0x5b/0x12b
    [ 34.546010] [<ffffffff81112d46>] create_object+0x39/0x283
    [ 34.546010] [<ffffffff8159655c>] kmemleak_alloc+0x73/0x98
    [ 34.546010] [<ffffffff81250c3c>] ? __debug_object_init+0x43/0x2e7
    [ 34.546010] [<ffffffff8110c5b4>] kmem_cache_alloc+0xc3/0x12b
    [ 34.546010] [<ffffffff810679c7>] ? sched_clock_local+0x12/0x75
    [ 34.546010] [<ffffffff81250c3c>] __debug_object_init+0x43/0x2e7
    [ 34.546010] [<ffffffff81067b92>] ? local_clock+0x2b/0x3c
    [ 34.546010] [<ffffffff81073b06>] ? lock_release_holdtime+0x59/0x60
    [ 34.546010] [<ffffffff81250ef4>] debug_object_init+0x14/0x16
    [ 34.546010] [<ffffffff8105fc57>] rcuhead_fixup_activate+0x27/0x5f
    [ 34.546010] [<ffffffff81250943>] debug_object_fixup+0x1e/0x2b
    [ 34.546010] [<ffffffff81250fdb>] debug_object_activate+0xcc/0xd9
    [ 34.546010] [<ffffffff8110939f>] ? discard_slab+0x4e/0x4e
    [ 34.546010] [<ffffffff810a8b77>] __call_rcu+0x4f/0x18e
    [ 34.546010] [<ffffffff810a8ce2>] call_rcu_sched+0x15/0x17
    [ 34.546010] [<ffffffff81109396>] discard_slab+0x45/0x4e
    [ 34.546010] [<ffffffff81109fa4>] unfreeze_partials+0x16a/0x193
    [ 34.546010] [<ffffffff81073b06>] ? lock_release_holdtime+0x59/0x60
    [ 34.546010] [<ffffffff815afd87>] ? _raw_spin_unlock_irqrestore+0x3f/0x55
    [ 34.546010] [<ffffffff8110a020>] put_cpu_partial+0x53/0xbd
    [ 34.546010] [<ffffffff8110a197>] __slab_free+0x10d/0x229
    [ 34.546010] [<ffffffff810f5e08>] ? anon_vma_free+0x3d/0x41
    [ 34.546010] [<ffffffff810f5e08>] ? anon_vma_free+0x3d/0x41
    [ 34.546010] [<ffffffff8110a44b>] kmem_cache_free+0x7d/0xc4
    [ 34.546010] [<ffffffff810f5e08>] anon_vma_free+0x3d/0x41
    [ 34.546010] [<ffffffff810f6d9e>] __put_anon_vma+0x38/0x3d
    [ 34.546010] [<ffffffff810f6dcc>] put_anon_vma+0x29/0x2d
    [ 34.546010] [<ffffffff810f6f28>] unlink_anon_vmas+0xf5/0x14c
    [ 34.546010] [<ffffffff815ae4c4>] ? mutex_unlock+0xe/0x10
    [ 34.546010] [<ffffffff810ed096>] free_pgtables+0x73/0xd0
    [ 34.546010] [<ffffffff810f30ad>] exit_mmap+0xac/0xe5
    [ 34.546010] [<ffffffff81043d05>] mmput+0x60/0x108
    [ 34.546010] [<ffffffff81048323>] exit_mm+0x119/0x126
    [ 34.546010] [<ffffffff815afd34>] ? _raw_spin_unlock_irq+0x30/0x44
    [ 34.546010] [<ffffffff81049a59>] do_exit+0x233/0x80f
    [ 34.546010] [<ffffffff81073330>] ? trace_hardirqs_off_caller+0x33/0x90
    [ 34.546010] [<ffffffff815affca>] ? retint_swapgs+0xe/0x13
    [ 34.546010] [<ffffffff8104a2dd>] do_group_exit+0x88/0xb6
    [ 34.546010] [<ffffffff8104a322>] sys_exit_group+0x17/0x1b
    [ 34.546010] [<ffffffff815b662b>] system_call_fastpath+0x16/0x1b






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