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Date: Wed, 30 Jul 2008 02:47:24 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: "Zdenek Kabelac" <zdenek.kabelac@gmail.com>
Cc: "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
       linux-wireless@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: INFO: possible recursive locking detected dev_deactivate
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On Tue, 29 Jul 2008 13:53:39 +0200 "Zdenek Kabelac" <zdenek.kabelac@gmail.com> wrote:

> Hi
> 
> With kernel from yesterdays' git (08/07/28) (sorry I've already
> deleted any traces for more precise commit number) - I've just found
> the bactrace in the log running already today's 2.6.27-rc1.
> 
> Happened during the reboot of 2.6.26
> As usually T61, 2GB, C2D
> 
> (wlan0): now unmanaged
> (wlan0): device state change: 3 -> 1
> (wlan0): cleaning up...
> (wlan0): taking down device.
> 
> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.26 #47
> ---------------------------------------------
> NetworkManager/2623 is trying to acquire lock:
>  (_xmit_IEEE80211#2){-...}, at: [<ffffffff812a3cd2>] dev_deactivate+0x82/0x150
> 
> but task is already holding lock:
>  (_xmit_IEEE80211#2){-...}, at: [<ffffffff812a3cd2>] dev_deactivate+0x82/0x150
> 
> other info that might help us debug this:
> 2 locks held by NetworkManager/2623:
>  #0:  (rtnl_mutex){--..}, at: [<ffffffff8129ca0a>] rtnetlink_rcv+0x1a/0x40
>  #1:  (_xmit_IEEE80211#2){-...}, at: [<ffffffff812a3cd2>]
> dev_deactivate+0x82/0x150
> 
> stack backtrace:
> Pid: 2623, comm: NetworkManager Not tainted 2.6.26 #47
> 
> Call Trace:
>  [<ffffffff81068b4a>] __lock_acquire+0xcea/0x13b0
>  [<ffffffff810674fd>] ? mark_held_locks+0x4d/0x90
>  [<ffffffff810657a4>] ? get_lock_stats+0x34/0x70
>  [<ffffffff812a3cd2>] ? dev_deactivate+0x82/0x150
>  [<ffffffff810692a6>] lock_acquire+0x96/0xe0
>  [<ffffffff812a3cd2>] ? dev_deactivate+0x82/0x150
>  [<ffffffff81315161>] _spin_lock+0x31/0x60
>  [<ffffffff812a3cd2>] dev_deactivate+0x82/0x150
>  [<ffffffff81292885>] dev_close+0x65/0xc0
>  [<ffffffffa013a9d9>] ieee80211_stop+0x339/0x4e0 [mac80211]
>  [<ffffffff81292896>] dev_close+0x76/0xc0
>  [<ffffffff81292461>] dev_change_flags+0xa1/0x1e0
>  [<ffffffff8129b774>] do_setlink+0x214/0x3a0
>  [<ffffffff81318c60>] ? sub_preempt_count+0x80/0x120
>  [<ffffffff81314e40>] ? _read_unlock+0x30/0x60
>  [<ffffffff8129bacd>] rtnl_setlink+0x10d/0x150
>  [<ffffffff8129cbbd>] rtnetlink_rcv_msg+0x18d/0x240
>  [<ffffffff8129ca30>] ? rtnetlink_rcv_msg+0x0/0x240
>  [<ffffffff812a77e9>] netlink_rcv_skb+0x89/0xb0
>  [<ffffffff8129ca19>] rtnetlink_rcv+0x29/0x40
>  [<ffffffff812a720d>] netlink_unicast+0x2cd/0x2e0
>  [<ffffffff8128b01e>] ? __alloc_skb+0x6e/0x150
>  [<ffffffff812a7424>] netlink_sendmsg+0x204/0x300
>  [<ffffffff81314e5e>] ? _read_unlock+0x4e/0x60
>  [<ffffffff812827d7>] sock_sendmsg+0x127/0x140
>  [<ffffffff81057120>] ? autoremove_wake_function+0x0/0x40
>  [<ffffffff810677ad>] ? trace_hardirqs_on+0xd/0x10
>  [<ffffffff8106773b>] ? trace_hardirqs_on_caller+0x14b/0x1b0
>  [<ffffffff812835f7>] ? move_addr_to_kernel+0x57/0x60
>  [<ffffffff8128c04f>] ? verify_iovec+0x3f/0xe0
>  [<ffffffff81282979>] sys_sendmsg+0x189/0x320
>  [<ffffffff812836fd>] ? sys_sendto+0xfd/0x120
>  [<ffffffff810e1a8c>] ? d_free+0x6c/0x80
>  [<ffffffff810cec01>] ? __fput+0x171/0x1c0
>  [<ffffffff8106773b>] ? trace_hardirqs_on_caller+0x14b/0x1b0
>  [<ffffffff813148d6>] ? trace_hardirqs_on_thunk+0x3a/0x3f
>  [<ffffffff8100c5bb>] system_call_fastpath+0x16/0x1b
> 
> iwl3945 0000:03:00.0: PCI INT A disabled

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