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Subject3.2-rc1: INFO: possible recursive locking detected
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
[ 350.148020]
[ 350.148020] stack backtrace:
[ 350.148020] Pid: 9439, comm: perf Not tainted 3.2.0-rc1-10791-g76a4b59-dirty #2
[ 350.148020] Call Trace:
[ 350.148020] [<ffffffff815e7278>] ? _raw_spin_unlock_irqrestore+0x38/0x80
[ 350.148020] [<ffffffff810932ff>] validate_chain+0xddf/0x1250
[ 350.148020] [<ffffffff8100a9b9>] ? native_sched_clock+0x29/0x80
[ 350.148020] [<ffffffff81080c2f>] ? local_clock+0x4f/0x60
[ 350.148020] [<ffffffff8108e939>] ? trace_hardirqs_off_caller+0x29/0x130
[ 350.148020] [<ffffffff81093b3f>] __lock_acquire+0x3cf/0xc00
[ 350.148020] [<ffffffff8100a9b9>] ? native_sched_clock+0x29/0x80
[ 350.148020] [<ffffffff81094a3d>] lock_acquire+0x9d/0x1d0
[ 350.148020] [<ffffffff8113847f>] ? get_partial_node+0x5f/0x360
[ 350.148020] [<ffffffff8100a9b9>] ? native_sched_clock+0x29/0x80
[ 350.148020] [<ffffffff81080c2f>] ? local_clock+0x4f/0x60
[ 350.148020] [<ffffffff815e6570>] _raw_spin_lock+0x40/0x80
[ 350.148020] [<ffffffff8113847f>] ? get_partial_node+0x5f/0x360
[ 350.148020] [<ffffffff8113847f>] get_partial_node+0x5f/0x360
[ 350.148020] [<ffffffff8100a9b9>] ? native_sched_clock+0x29/0x80
[ 350.148020] [<ffffffff8100a9b9>] ? native_sched_clock+0x29/0x80
[ 350.148020] [<ffffffff8113a836>] ? T.1029+0x36/0x3f0
[ 350.148020] [<ffffffff813741ba>] ? __debug_object_init+0x3ba/0x3d0
[ 350.148020] [<ffffffff8113a9b7>] T.1029+0x1b7/0x3f0
[ 350.148020] [<ffffffff813741ba>] ? __debug_object_init+0x3ba/0x3d0
[ 350.148020] [<ffffffff8100a9b9>] ? native_sched_clock+0x29/0x80
[ 350.148020] [<ffffffff813741ba>] ? __debug_object_init+0x3ba/0x3d0
[ 350.148020] [<ffffffff8113ace6>] kmem_cache_alloc+0xf6/0x200
[ 350.148020] [<ffffffff813741ba>] __debug_object_init+0x3ba/0x3d0
[ 350.148020] [<ffffffff815e7278>] ? _raw_spin_unlock_irqrestore+0x38/0x80
[ 350.148020] [<ffffffff8137421f>] debug_object_init+0x1f/0x30
[ 350.148020] [<ffffffff81075f94>] rcuhead_fixup_activate+0x34/0xe0
[ 350.148020] [<ffffffff813732a3>] debug_object_fixup+0x13/0x20
[ 350.148020] [<ffffffff8137394c>] debug_object_activate+0xbc/0x160
[ 350.148020] [<ffffffff81137c20>] ? deactivate_slab+0x7c0/0x7c0
[ 350.148020] [<ffffffff810c8f52>] __call_rcu+0x42/0x1d0
[ 350.148020] [<ffffffff810c90f5>] call_rcu+0x15/0x20
[ 350.148020] [<ffffffff81137454>] discard_slab+0x44/0x50
[ 350.148020] [<ffffffff8113822f>] unfreeze_partials+0x2ff/0x3c0
[ 350.148020] [<ffffffff8100a9b9>] ? native_sched_clock+0x29/0x80
[ 350.148020] [<ffffffff811383d9>] ? put_cpu_partial+0x99/0xe0
[ 350.148020] [<ffffffff811383e1>] put_cpu_partial+0xa1/0xe0
[ 350.148020] [<ffffffff81139d22>] __slab_free+0x102/0x470
[ 350.148020] [<ffffffff8104ef17>] ? __cleanup_sighand+0x27/0x30
[ 350.148020] [<ffffffff8113a7f0>] kmem_cache_free+0x220/0x230
[ 350.148020] [<ffffffff8104ef17>] __cleanup_sighand+0x27/0x30
[ 350.148020] [<ffffffff8105548b>] release_task+0x23b/0x500
[ 350.148020] [<ffffffff8105526d>] ? release_task+0x1d/0x500
[ 350.148020] [<ffffffff81056043>] wait_consider_task+0x8f3/0xc40
[ 350.148020] [<ffffffff810564b1>] do_wait+0x121/0x340
[ 350.148020] [<ffffffff81056773>] sys_wait4+0xa3/0x100
[ 350.148020] [<ffffffff810544e0>] ? wait_noreap_copyout+0x150/0x150
[ 350.148020] [<ffffffff815e7dab>] system_call_fastpath+0x16/0x1b



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