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SubjectINFO: possible recursive locking detected dev_deactivate
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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