linux-kernel - Re: possible recursive locking, 2.6.24-rc7

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Date:	Sun, 13 Jan 2008 17:22:39 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: possible recursive locking, 2.6.24-rc7


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: [<c01175ff>] __wake_up+0x15/0x42
> [159859.492883]
> [159859.492884] but task is already holding lock:
> [159859.493140]  (&q->lock){++..}, at: [<c01175ff>] __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: [<c02dd9af>]
> netif_receive_skb+                                                           
>                  0x9c/0x3a7
> [159859.496141]  #1:  (rcu_read_lock){..--}, at: [<c02f8072>]
> ip_local_deliver_f                                                           
>                  inish+0x30/0x18d
> [159859.496604]  #2:  (slock-AF_INET/1){-+..}, at: [<c0310474>]
> tcp_v4_rcv+0x426                                                             
>                /0x812
> [159859.497104]  #3:  (clock-AF_INET){-.-?}, at: [<c02d7684>]
> sock_def_readable+                                                           
>                  0x18/0x6e
> [159859.497555]  #4:  (&q->lock){++..}, at: [<c01175ff>] __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]  [<c0105e68>] show_trace_log_lvl+0x1a/0x2f
> [159859.498505]  [<c0106810>] show_trace+0x12/0x14
> [159859.498690]  [<c0107107>] dump_stack+0x6c/0x72
> [159859.498872]  [<c01384c0>] __lock_acquire+0x172/0xb8c
> [159859.499057]  [<c01392a7>] lock_acquire+0x5f/0x78
> [159859.499239]  [<c03299cf>] _spin_lock_irqsave+0x34/0x44
> [159859.499423]  [<c01175ff>] __wake_up+0x15/0x42
> [159859.499604]  [<c01869ea>] ep_poll_safewake+0x8e/0xbf
> [159859.499787]  [<c01876b3>] ep_poll_callback+0x9f/0xac
> [159859.499970]  [<c0115d36>] __wake_up_common+0x32/0x5c
> [159859.500154]  [<c011761b>] __wake_up+0x31/0x42
> [159859.500335]  [<c02d76ae>] sock_def_readable+0x42/0x6e
> [159859.500518]  [<c0309105>] tcp_rcv_established+0x3bc/0x643
> [159859.500704]  [<c030e588>] tcp_v4_do_rcv+0x2f/0x325
> [159859.500887]  [<c0310817>] tcp_v4_rcv+0x7c9/0x812
> [159859.501069]  [<c02f8149>] ip_local_deliver_finish+0x107/0x18d
> [159859.501255]  [<c02f854e>] ip_local_deliver+0x72/0x7c
> [159859.501438]  [<c02f8023>] ip_rcv_finish+0x2cf/0x2ee
> [159859.501623]  [<c02f84b2>] ip_rcv+0x211/0x23b
> [159859.501805]  [<c02ddc63>] netif_receive_skb+0x350/0x3a7
> [159859.501989]  [<f88f2b6d>] bnx2_poll+0x975/0xb45 [bnx2]
> [159859.502177]  [<c02dfdab>] net_rx_action+0x6c/0x116
> [159859.502360]  [<c0120ed8>] __do_softirq+0x6f/0xe9
> [159859.502543]  [<c0120f8c>] do_softirq+0x3a/0x52
> [159859.502728]  [<c012128b>] irq_exit+0x47/0x7b
> [159859.502911]  [<c01076af>] do_IRQ+0x81/0x96
> [159859.503098]  [<c010586a>] common_interrupt+0x2e/0x34
> [159859.503288]  [<c0103434>] mwait_idle+0x12/0x14
> [159859.503476]  [<c010353d>] cpu_idle+0x7b/0x95
> [159859.503662]  [<c03272c9>] rest_init+0x49/0x4b
> [159859.503844]  [<c0449c08>] start_kernel+0x2f9/0x301
> [159859.504030]  [<00000000>] 0x0
> [159859.504210]  =======================


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