From: Max Krasnyansky <maxk@qualcomm.com>
To: "John W. Linville" <linville@tuxdriver.com>,
David Miller <davem@davemloft.net>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Circular locking (rtnl_mutex & _xmit_IEEE80211) during suspend
Date: Sun, 03 Aug 2008 11:35:27 -0700 [thread overview]
Message-ID: <4895FA6F.8050209@qualcomm.com> (raw)
Got this lockdep complaint yesterday
--
wlan0: disassociating by local choice (reason=3)
=============================================
[ INFO: possible recursive locking detected ]
2.6.27-rc1 #29
---------------------------------------------
NetworkManager/1744 is trying to acquire lock:
(_xmit_IEEE80211#2){-+..}, at: [<ffffffff804b18ea>] dev_deactivate+0x9a/0x150
but task is already holding lock:
(_xmit_IEEE80211#2){-+..}, at: [<ffffffff804b18ea>] dev_deactivate+0x9a/0x150
other info that might help us debug this:
2 locks held by NetworkManager/1744:
#0: (rtnl_mutex){--..}, at: [<ffffffff804ac8fa>] rtnetlink_rcv+0x1a/0x40
#1: (_xmit_IEEE80211#2){-+..}, at: [<ffffffff804b18ea>]
dev_deactivate+0x9a/0x150
stack backtrace:
Pid: 1744, comm: NetworkManager Not tainted 2.6.27-rc1 #29
Call Trace:
[<ffffffff80261dcf>] __lock_acquire+0x92f/0x1020
[<ffffffff80260dfd>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff80260dd1>] ? trace_hardirqs_on_caller+0xe1/0x100
[<ffffffff804b15cb>] ? dev_deactivate_queue+0x4b/0x60
[<ffffffff802406ed>] ? local_bh_disable+0xd/0x10
[<ffffffff8026251b>] lock_acquire+0x5b/0x80
[<ffffffff804b18ea>] ? dev_deactivate+0x9a/0x150
[<ffffffff80532f6f>] _spin_lock+0x2f/0x40
[<ffffffff804b18ea>] dev_deactivate+0x9a/0x150
[<ffffffff804a2955>] dev_close+0x55/0xb0
[<ffffffff8050777d>] ieee80211_stop+0x36d/0x450
[<ffffffff804a2966>] dev_close+0x66/0xb0
[<ffffffff804a2541>] dev_change_flags+0xa1/0x1e0
[<ffffffff804ab6ac>] do_setlink+0x20c/0x3a0
[<ffffffff805366e0>] ? sub_preempt_count+0x80/0xd0
[<ffffffff80532ce0>] ? _read_unlock+0x30/0x60
[<ffffffff804aba0d>] rtnl_setlink+0x10d/0x150
[<ffffffff804acaad>] rtnetlink_rcv_msg+0x18d/0x240
[<ffffffff804ac920>] ? rtnetlink_rcv_msg+0x0/0x240
[<ffffffff804b52b9>] netlink_rcv_skb+0x89/0xb0
[<ffffffff804ac909>] rtnetlink_rcv+0x29/0x40
[<ffffffff804b4e59>] ? netlink_sendmsg+0x139/0x2d0
[<ffffffff804b4d0d>] netlink_unicast+0x2cd/0x2e0
[<ffffffff8049b9de>] ? __alloc_skb+0x6e/0x150
[<ffffffff804b4ef3>] netlink_sendmsg+0x1d3/0x2d0
[<ffffffff80493a0f>] sock_sendmsg+0xdf/0x110
[<ffffffff80251a70>] ? autoremove_wake_function+0x0/0x40
[<ffffffff80260dfd>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff80260dd1>] ? trace_hardirqs_on_caller+0xe1/0x100
[<ffffffff80260dfd>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff802b7c2e>] ? fget_light+0xce/0xe0
[<ffffffff80492a8b>] ? move_addr_to_kernel+0x2b/0x40
[<ffffffff8049c9dc>] ? verify_iovec+0x3c/0xd0
[<ffffffff80493bc9>] sys_sendmsg+0x189/0x320
[<ffffffff80494807>] ? move_addr_to_user+0x67/0x80
[<ffffffff80493015>] ? sockfd_lookup_light+0x25/0x90
[<ffffffff80493e5f>] ? sys_sendto+0xff/0x120
[<ffffffff80260dd1>] ? trace_hardirqs_on_caller+0xe1/0x100
[<ffffffff805327d6>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff8020b9db>] system_call_fastpath+0x16/0x1b
iwl3945 0000:0c:00.0: PCI INT A disabled
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.00 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
next reply other threads:[~2008-08-03 18:35 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-03 18:35 Max Krasnyansky [this message]
2008-08-03 21:01 ` Circular locking (rtnl_mutex & _xmit_IEEE80211) during suspend David Miller
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