From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752767AbYAMQZI (ORCPT ); Sun, 13 Jan 2008 11:25:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753247AbYAMQYk (ORCPT ); Sun, 13 Jan 2008 11:24:40 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:48494 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753215AbYAMQYg (ORCPT ); Sun, 13 Jan 2008 11:24:36 -0500 Subject: Re: possible recursive locking, 2.6.24-rc7 From: Peter Zijlstra To: Denys Fedoryshchenko Cc: linux-kernel@vger.kernel.org In-Reply-To: <20080113155142.M6056@visp.net.lb> References: <20080113155142.M6056@visp.net.lb> Content-Type: text/plain Date: Sun, 13 Jan 2008 17:22:39 +0100 Message-Id: <1200241360.7999.29.camel@lappy> Mime-Version: 1.0 X-Mailer: Evolution 2.21.4 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2008-01-13 at 17:51 +0200, Denys Fedoryshchenko wrote: > Hi, got in dmesg > Not sure where to send (there is TCP), so sending netdev@ and kernel@ It's epoll, this is a known issue and will be fixed soon. Thanks for reporting. > [159859.491752] > [159859.491755] ============================================= > [159859.492021] [ INFO: possible recursive locking detected ] > [159859.492156] 2.6.24-rc7-devel #2 > [159859.492284] --------------------------------------------- > [159859.492418] swapper/0 is trying to acquire lock: > [159859.492550] (&q->lock){++..}, at: [] __wake_up+0x15/0x42 > [159859.492883] > [159859.492884] but task is already holding lock: > [159859.493140] (&q->lock){++..}, at: [] __wake_up+0x15/0x42 > [159859.493466] > [159859.493467] other info that might help us debug this: > [159859.493726] 5 locks held by swapper/0: > [159859.495687] #0: (rcu_read_lock){..--}, at: [] > netif_receive_skb+ > 0x9c/0x3a7 > [159859.496141] #1: (rcu_read_lock){..--}, at: [] > ip_local_deliver_f > inish+0x30/0x18d > [159859.496604] #2: (slock-AF_INET/1){-+..}, at: [] > tcp_v4_rcv+0x426 > /0x812 > [159859.497104] #3: (clock-AF_INET){-.-?}, at: [] > sock_def_readable+ > 0x18/0x6e > [159859.497555] #4: (&q->lock){++..}, at: [] __wake_up+0x15/0x42 > [159859.497931] > [159859.497932] stack backtrace: > [159859.498185] Pid: 0, comm: swapper Not tainted 2.6.24-rc7-devel #2 > [159859.498320] [] show_trace_log_lvl+0x1a/0x2f > [159859.498505] [] show_trace+0x12/0x14 > [159859.498690] [] dump_stack+0x6c/0x72 > [159859.498872] [] __lock_acquire+0x172/0xb8c > [159859.499057] [] lock_acquire+0x5f/0x78 > [159859.499239] [] _spin_lock_irqsave+0x34/0x44 > [159859.499423] [] __wake_up+0x15/0x42 > [159859.499604] [] ep_poll_safewake+0x8e/0xbf > [159859.499787] [] ep_poll_callback+0x9f/0xac > [159859.499970] [] __wake_up_common+0x32/0x5c > [159859.500154] [] __wake_up+0x31/0x42 > [159859.500335] [] sock_def_readable+0x42/0x6e > [159859.500518] [] tcp_rcv_established+0x3bc/0x643 > [159859.500704] [] tcp_v4_do_rcv+0x2f/0x325 > [159859.500887] [] tcp_v4_rcv+0x7c9/0x812 > [159859.501069] [] ip_local_deliver_finish+0x107/0x18d > [159859.501255] [] ip_local_deliver+0x72/0x7c > [159859.501438] [] ip_rcv_finish+0x2cf/0x2ee > [159859.501623] [] ip_rcv+0x211/0x23b > [159859.501805] [] netif_receive_skb+0x350/0x3a7 > [159859.501989] [] bnx2_poll+0x975/0xb45 [bnx2] > [159859.502177] [] net_rx_action+0x6c/0x116 > [159859.502360] [] __do_softirq+0x6f/0xe9 > [159859.502543] [] do_softirq+0x3a/0x52 > [159859.502728] [] irq_exit+0x47/0x7b > [159859.502911] [] do_IRQ+0x81/0x96 > [159859.503098] [] common_interrupt+0x2e/0x34 > [159859.503288] [] mwait_idle+0x12/0x14 > [159859.503476] [] cpu_idle+0x7b/0x95 > [159859.503662] [] rest_init+0x49/0x4b > [159859.503844] [] start_kernel+0x2f9/0x301 > [159859.504030] [<00000000>] 0x0 > [159859.504210] =======================