From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932361Ab1KIJGI (ORCPT ); Wed, 9 Nov 2011 04:06:08 -0500 Received: from mail-yw0-f46.google.com ([209.85.213.46]:47533 "EHLO mail-yw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932139Ab1KIJGG (ORCPT ); Wed, 9 Nov 2011 04:06:06 -0500 Date: Wed, 9 Nov 2011 17:05:57 +0800 From: Yong Zhang To: linux-kernel@vger.kernel.org Cc: Pekka Enberg , "Paul E. McKenney" , Thomas Gleixner Subject: 3.2-rc1: INFO: possible recursive locking detected Message-ID: <20111109090556.GA5949@zhy> Reply-To: Yong Zhang MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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: [] get_partial_node+0x5f/0x360 [ 350.148020] [ 350.148020] but task is already holding lock: [ 350.148020] (&(&n->list_lock)->rlock){-.-...}, at: [] 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: [] release_task+0x9e/0x500 [ 350.148020] #1: (&(&n->list_lock)->rlock){-.-...}, at: [] 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] [] ? _raw_spin_unlock_irqrestore+0x38/0x80 [ 350.148020] [] validate_chain+0xddf/0x1250 [ 350.148020] [] ? native_sched_clock+0x29/0x80 [ 350.148020] [] ? local_clock+0x4f/0x60 [ 350.148020] [] ? trace_hardirqs_off_caller+0x29/0x130 [ 350.148020] [] __lock_acquire+0x3cf/0xc00 [ 350.148020] [] ? native_sched_clock+0x29/0x80 [ 350.148020] [] lock_acquire+0x9d/0x1d0 [ 350.148020] [] ? get_partial_node+0x5f/0x360 [ 350.148020] [] ? native_sched_clock+0x29/0x80 [ 350.148020] [] ? local_clock+0x4f/0x60 [ 350.148020] [] _raw_spin_lock+0x40/0x80 [ 350.148020] [] ? get_partial_node+0x5f/0x360 [ 350.148020] [] get_partial_node+0x5f/0x360 [ 350.148020] [] ? native_sched_clock+0x29/0x80 [ 350.148020] [] ? native_sched_clock+0x29/0x80 [ 350.148020] [] ? T.1029+0x36/0x3f0 [ 350.148020] [] ? __debug_object_init+0x3ba/0x3d0 [ 350.148020] [] T.1029+0x1b7/0x3f0 [ 350.148020] [] ? __debug_object_init+0x3ba/0x3d0 [ 350.148020] [] ? native_sched_clock+0x29/0x80 [ 350.148020] [] ? __debug_object_init+0x3ba/0x3d0 [ 350.148020] [] kmem_cache_alloc+0xf6/0x200 [ 350.148020] [] __debug_object_init+0x3ba/0x3d0 [ 350.148020] [] ? _raw_spin_unlock_irqrestore+0x38/0x80 [ 350.148020] [] debug_object_init+0x1f/0x30 [ 350.148020] [] rcuhead_fixup_activate+0x34/0xe0 [ 350.148020] [] debug_object_fixup+0x13/0x20 [ 350.148020] [] debug_object_activate+0xbc/0x160 [ 350.148020] [] ? deactivate_slab+0x7c0/0x7c0 [ 350.148020] [] __call_rcu+0x42/0x1d0 [ 350.148020] [] call_rcu+0x15/0x20 [ 350.148020] [] discard_slab+0x44/0x50 [ 350.148020] [] unfreeze_partials+0x2ff/0x3c0 [ 350.148020] [] ? native_sched_clock+0x29/0x80 [ 350.148020] [] ? put_cpu_partial+0x99/0xe0 [ 350.148020] [] put_cpu_partial+0xa1/0xe0 [ 350.148020] [] __slab_free+0x102/0x470 [ 350.148020] [] ? __cleanup_sighand+0x27/0x30 [ 350.148020] [] kmem_cache_free+0x220/0x230 [ 350.148020] [] __cleanup_sighand+0x27/0x30 [ 350.148020] [] release_task+0x23b/0x500 [ 350.148020] [] ? release_task+0x1d/0x500 [ 350.148020] [] wait_consider_task+0x8f3/0xc40 [ 350.148020] [] do_wait+0x121/0x340 [ 350.148020] [] sys_wait4+0xa3/0x100 [ 350.148020] [] ? wait_noreap_copyout+0x150/0x150 [ 350.148020] [] system_call_fastpath+0x16/0x1b