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    Subject2.6.26-rc5: SLUB debug, lockdep warning...
    When enabling lockdep + SLUB debugging, I spotted this recursive
    lock-acquisition warning [1] when booting, however it doesn't always
    pop out.

    Let me know if you need further information etc.

    Daniel

    --- [1]

    =======================================================
    [ INFO: possible circular locking dependency detected ]
    2.6.26-rc5-201c #1
    -------------------------------------------------------
    nscd/3669 is trying to acquire lock:
    (&n->list_lock){.+..}, at: [<ffffffff802bab03>] deactivate_slab+0x173/0x1e0

    but task is already holding lock:
    (&obj_hash[i].lock){++..}, at: [<ffffffff803fa56f>]
    __debug_object_init+0x2f/0x350

    which lock already depends on the new lock.

    the existing dependency chain (in reverse order) is:

    -> #1 (&obj_hash[i].lock){++..}:
    [<ffffffff80278dad>] __lock_acquire+0xbdd/0x1020
    [<ffffffff80279255>] lock_acquire+0x65/0x90
    [<ffffffff805e1027>] _spin_lock_irqsave+0x47/0x80
    [<ffffffff803f9eec>] __debug_check_no_obj_freed+0x6c/0x160
    [<ffffffff803f9ff5>] debug_check_no_obj_freed+0x15/0x20
    [<ffffffff80296b6d>] free_hot_cold_page+0x10d/0x250
    [<ffffffff80296cfb>] free_hot_page+0xb/0x10
    [<ffffffff80296d25>] __free_pages+0x25/0x40
    [<ffffffff802ba886>] __free_slab+0x96/0x150
    [<ffffffff802ba96f>] discard_slab+0x2f/0x50
    [<ffffffff802bebe0>] kmem_cache_shrink+0x150/0x280
    [<ffffffff8040a8ae>] acpi_os_purge_cache+0x9/0xd
    [<ffffffff804217b0>] acpi_purge_cached_objects+0x10/0x38
    [<ffffffff80421836>] acpi_initialize_objects+0x49/0x54
    [<ffffffff8082ba27>] acpi_init+0x8c/0x221
    [<ffffffff80812a98>] kernel_init+0x138/0x320
    [<ffffffff80227418>] child_rip+0xa/0x12
    [<ffffffffffffffff>] 0xffffffffffffffff

    -> #0 (&n->list_lock){.+..}:
    [<ffffffff80278c17>] __lock_acquire+0xa47/0x1020
    [<ffffffff80279255>] lock_acquire+0x65/0x90
    [<ffffffff805e0c41>] _spin_lock+0x31/0x60
    [<ffffffff802bab03>] deactivate_slab+0x173/0x1e0
    [<ffffffff802bbb12>] __slab_alloc+0x132/0x550
    [<ffffffff802bc0d0>] kmem_cache_alloc+0xc0/0xd0
    [<ffffffff803fa7f4>] __debug_object_init+0x2b4/0x350
    [<ffffffff803fa8ac>] debug_object_init_on_stack+0x1c/0x30
    [<ffffffff8026ce59>] hrtimer_init_on_stack+0x29/0x50
    [<ffffffff8027ae09>] futex_wait+0x249/0x480
    [<ffffffff8027c248>] do_futex+0xb8/0xad0
    [<ffffffff8027cd05>] sys_futex+0xa5/0x120
    [<ffffffff802264ab>] system_call_after_swapgs+0x7b/0x80
    [<ffffffffffffffff>] 0xffffffffffffffff

    other info that might help us debug this:

    1 lock held by nscd/3669:
    #0: (&obj_hash[i].lock){++..}, at: [<ffffffff803fa56f>]
    __debug_object_init+0x2f/0x350

    stack backtrace:
    Pid: 3669, comm: nscd Not tainted 2.6.26-rc5-201c #1

    Call Trace:
    [<ffffffff80276683>] print_circular_bug_tail+0x83/0x90
    [<ffffffff80278c17>] __lock_acquire+0xa47/0x1020
    [<ffffffff80279255>] lock_acquire+0x65/0x90
    [<ffffffff802bab03>] ? deactivate_slab+0x173/0x1e0
    [<ffffffff805e0c41>] _spin_lock+0x31/0x60
    [<ffffffff802bab03>] deactivate_slab+0x173/0x1e0
    [<ffffffff802bbb12>] __slab_alloc+0x132/0x550
    [<ffffffff803fa7f4>] ? __debug_object_init+0x2b4/0x350
    [<ffffffff803fa7f4>] ? __debug_object_init+0x2b4/0x350
    [<ffffffff802bc0d0>] kmem_cache_alloc+0xc0/0xd0
    [<ffffffff803fa7f4>] __debug_object_init+0x2b4/0x350
    [<ffffffff803fa8ac>] debug_object_init_on_stack+0x1c/0x30
    [<ffffffff8026ce59>] hrtimer_init_on_stack+0x29/0x50
    [<ffffffff8027ae09>] futex_wait+0x249/0x480
    [<ffffffff80275103>] ? get_lock_stats+0x23/0x70
    [<ffffffff8023c815>] ? flat_send_IPI_mask+0x55/0x90
    [<ffffffff8023711e>] ? native_smp_send_reschedule+0x2e/0x50
    [<ffffffff8024740b>] ? __resched_task+0x6b/0x80
    [<ffffffff8024782c>] ? hrtick_start_fair+0x11c/0x160
    [<ffffffff80249e20>] ? default_wake_function+0x0/0x10
    [<ffffffff8027c248>] do_futex+0xb8/0xad0
    [<ffffffff80275103>] ? get_lock_stats+0x23/0x70
    [<ffffffff802751e6>] ? lock_release_holdtime+0x66/0x80
    [<ffffffff803f246d>] ? __up_read+0x4d/0xb0
    [<ffffffff805e1475>] ? _spin_unlock_irqrestore+0x65/0x80
    [<ffffffff80277c8f>] ? trace_hardirqs_on+0xbf/0x150
    [<ffffffff8022d059>] ? read_tsc+0x9/0x20
    [<ffffffff8026f266>] ? getnstimeofday+0x36/0xb0
    [<ffffffff8026d04a>] ? ktime_get_ts+0x4a/0x60
    [<ffffffff8027cd05>] sys_futex+0xa5/0x120
    [<ffffffff802264ab>] system_call_after_swapgs+0x7b/0x80
    --
    Daniel J Blueman


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