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Date: Sat, 8 Mar 2008 12:16:52 +0200
From: "Denys Fedoryshchenko" <denys@...p.net.lb>
To: Jarek Poplawski <jarkao2@...il.com>, jamal <hadi@...erus.ca>
Cc: netdev@...r.kernel.org
Subject: Re: circular locking, mirred, 2.6.24.2
Update. I am not able to reproduce on my PC, but still able to reproduce on
PPPoE server (but here i cannot take risk to use 2.6.25-rcX kernels). This is
PPPoE:
[2148614.154684]
[2148614.154688] =======================================================
[2148614.154805] [ INFO: possible circular locking dependency detected ]
[2148614.154862] 2.6.24.3-build-0023 #9
[2148614.154913] -------------------------------------------------------
[2148614.154969] swapper/0 is trying to acquire lock:
[2148614.155023] (&ifb_queue_lock_key){-+..}, at: [<c0289d4d>]
dev_queue_xmit+0x177/0x302
[2148614.155245]
[2148614.155246] but task is already holding lock:
[2148614.155346] (&p->tcfc_lock){-+..}, at: [<f8a10066>] tcf_mirred+0x20/
0x180 [act_mirred]
[2148614.155569]
[2148614.155570] which lock already depends on the new lock.
[2148614.155571]
[2148614.155715]
[2148614.155716] the existing dependency chain (in reverse order) is:
[2148614.155817]
[2148614.155818] -> #2 (&p->tcfc_lock){-+..}:
[2148614.156026] [<c014368c>] __lock_acquire+0xa30/0xc19
[2148614.156371] [<c01438ef>] lock_acquire+0x7a/0x94
[2148614.156714] [<c02d9525>] _spin_lock+0x2e/0x58
[2148614.157062] [<f89e638d>] tcf_ipt+0x4b/0xde [act_ipt]
[2148614.157412] [<c0298000>] tcf_action_exec+0x44/0x77
[2148614.157764] [<f89da5d2>] u32_classify+0x119/0x24a [cls_u32]
[2148614.158116] [<c0295e1e>] tc_classify_compat+0x2f/0x5e
[2148614.158460] [<c0295fff>] tc_classify+0x1a/0x80
[2148614.158802] [<f89ec118>] ingress_enqueue+0x1a/0x53 [sch_ingress]
[2148614.159152] [<c0287275>] netif_receive_skb+0x296/0x44c
[2148614.159496] [<c0289ada>] process_backlog+0x77/0xd4
[2148614.159839] [<c02895f8>] net_rx_action+0xbf/0x201
[2148614.160183] [<c012ac15>] __do_softirq+0x6f/0xe9
[2148614.160530] [<c01078af>] do_softirq+0x61/0xc8
[2148614.160876] [<ffffffff>] 0xffffffff
[2148614.161226]
[2148614.161227] -> #1 (&dev->ingress_lock){-+..}:
[2148614.161435] [<c014368c>] __lock_acquire+0xa30/0xc19
[2148614.161781] [<c01438ef>] lock_acquire+0x7a/0x94
[2148614.162123] [<c02d9525>] _spin_lock+0x2e/0x58
[2148614.162465] [<c02954c3>] qdisc_lock_tree+0x1e/0x21
[2148614.162807] [<c0296ba5>] qdisc_create+0x17e/0x1e3
[2148614.163148] [<c0297368>] tc_modify_qdisc+0x2a3/0x3a3
[2148614.163490] [<c029051d>] rtnetlink_rcv_msg+0x18e/0x1a8
[2148614.163835] [<c029b670>] netlink_rcv_skb+0x30/0x82
[2148614.164181] [<c0290387>] rtnetlink_rcv+0x17/0x1f
[2148614.164523] [<c029b444>] netlink_unicast+0x19c/0x205
[2148614.164868] [<c029bc41>] netlink_sendmsg+0x250/0x25c
[2148614.165210] [<c027d894>] sock_sendmsg+0xcc/0xe5
[2148614.165554] [<c027da00>] sys_sendmsg+0x153/0x1b1
[2148614.165898] [<c027e860>] sys_socketcall+0x203/0x222
[2148614.166242] [<c0104e9a>] sysenter_past_esp+0x5f/0xa5
[2148614.166589] [<ffffffff>] 0xffffffff
[2148614.166935]
[2148614.166936] -> #0 (&ifb_queue_lock_key){-+..}:
[2148614.167143] [<c014357c>] __lock_acquire+0x920/0xc19
[2148614.167490] [<c01438ef>] lock_acquire+0x7a/0x94
[2148614.167832] [<c02d9525>] _spin_lock+0x2e/0x58
[2148614.168176] [<c0289d4d>] dev_queue_xmit+0x177/0x302
[2148614.168529] [<f8a101a5>] tcf_mirred+0x15f/0x180 [act_mirred]
[2148614.168878] [<c0298000>] tcf_action_exec+0x44/0x77
[2148614.169223] [<f89da5d2>] u32_classify+0x119/0x24a [cls_u32]
[2148614.169571] [<c0295e1e>] tc_classify_compat+0x2f/0x5e
[2148614.169914] [<c0295fff>] tc_classify+0x1a/0x80
[2148614.170257] [<f89ec118>] ingress_enqueue+0x1a/0x53 [sch_ingress]
[2148614.170605] [<c0287275>] netif_receive_skb+0x296/0x44c
[2148614.170950] [<c0289ada>] process_backlog+0x77/0xd4
[2148614.171293] [<c02895f8>] net_rx_action+0xbf/0x201
[2148614.171635] [<c012ac15>] __do_softirq+0x6f/0xe9
[2148614.171978] [<c01078af>] do_softirq+0x61/0xc8
[2148614.172321] [<ffffffff>] 0xffffffff
[2148614.172664]
[2148614.172665] other info that might help us debug this:
[2148614.172666]
[2148614.172810] 5 locks held by swapper/0:
[2148614.172862] #0: (rcu_read_lock){..--}, at: [<c0289589>]
net_rx_action+0x50/0x201
[2148614.173111] #1: (rcu_read_lock){..--}, at: [<c02870d5>]
netif_receive_skb+0xf6/0x44c
[2148614.173359] #2: (&dev->ingress_lock){-+..}, at: [<c0287261>]
netif_receive_skb+0x282/0x44c
[2148614.173608] #3: (&p->tcfc_lock){-+..}, at: [<f8a10066>]
tcf_mirred+0x20/0x180 [act_mirred]
[2148614.173859] #4: (rcu_read_lock){..--}, at: [<c0289cf3>]
dev_queue_xmit+0x11d/0x302
[2148614.174110]
[2148614.174111] stack backtrace:
[2148614.174208] Pid: 0, comm: swapper Not tainted 2.6.24.3-build-0023 #9
[2148614.174265] [<c0105f2a>] show_trace_log_lvl+0x1a/0x2f
[2148614.174360] [<c0106843>] show_trace+0x12/0x14
[2148614.174452] [<c010713a>] dump_stack+0x6c/0x72
[2148614.174541] [<c014175c>] print_circular_bug_tail+0x5f/0x68
[2148614.174634] [<c014357c>] __lock_acquire+0x920/0xc19
[2148614.174725] [<c01438ef>] lock_acquire+0x7a/0x94
[2148614.174814] [<c02d9525>] _spin_lock+0x2e/0x58
[2148614.174904] [<c0289d4d>] dev_queue_xmit+0x177/0x302
[2148614.174995] [<f8a101a5>] tcf_mirred+0x15f/0x180 [act_mirred]
[2148614.175091] [<c0298000>] tcf_action_exec+0x44/0x77
[2148614.175183] [<f89da5d2>] u32_classify+0x119/0x24a [cls_u32]
[2148614.175279] [<c0295e1e>] tc_classify_compat+0x2f/0x5e
[2148614.175370] [<c0295fff>] tc_classify+0x1a/0x80
[2148614.175460] [<f89ec118>] ingress_enqueue+0x1a/0x53 [sch_ingress]
[2148614.175554] [<c0287275>] netif_receive_skb+0x296/0x44c
[2148614.175646] [<c0289ada>] process_backlog+0x77/0xd4
[2148614.175735] [<c02895f8>] net_rx_action+0xbf/0x201
[2148614.175825] [<c012ac15>] __do_softirq+0x6f/0xe9
[2148614.175915] [<c01078af>] do_softirq+0x61/0xc8
[2148614.176005] =======================
On Sat, 8 Mar 2008 09:58:54 +0100, Jarek Poplawski wrote
> On Sat, Mar 08, 2008 at 09:46:28AM +0100, Jarek Poplawski wrote:
> ....
> > said doesn't use this patch with it's ingress (at least currently).
>
> + said doesn't use this path with it's ingress (at least currently).
>
> Jarek P.
> --
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--
Denys Fedoryshchenko
Technical Manager
Virtual ISP S.A.L.
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