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SubjectRe: possible recursive locking, 2.6.24-rc7
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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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