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Date: Mon, 12 Oct 2009 08:28:36 -0400
From: Miles Lane <miles.lane@...il.com>
To: LKML <linux-kernel@...r.kernel.org>,
Johannes Berg <johannes@...solutions.net>,
linux-wireless <linux-wireless@...r.kernel.org>
Subject: 2.6.32-rc4-git1 -- INFO: possible circular locking dependency
detected
[ 823.466853] [ INFO: possible circular locking dependency detected ]
[ 823.466866] 2.6.32-rc4-git1 #2
[ 823.466873] -------------------------------------------------------
[ 823.466884] swapper/0 is trying to acquire lock:
[ 823.466893] (&sta->lock){+.-...}, at: [<f857bda4>]
sta_addba_resp_timer_expired+0x1b/0x50 [mac80211]
[ 823.466940]
[ 823.466943] but task is already holding lock:
[ 823.466953]
(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer){+.-...}, at:
[<c1032f22>] run_timer_softirq+0x125/0x1e5
[ 823.466984]
[ 823.466987] which lock already depends on the new lock.
[ 823.466991]
[ 823.467000]
[ 823.467002] the existing dependency chain (in reverse order) is:
[ 823.467013]
[ 823.467015] -> #1 (&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer){+.-...}:
[ 823.467037] [<c104ac2c>] __lock_acquire+0x9fb/0xb6d
[ 823.467056] [<c104adfa>] lock_acquire+0x5c/0x73
[ 823.467072] [<c10336b8>] del_timer_sync+0x29/0x6c
[ 823.467089] [<f857bceb>]
ieee80211_process_addba_resp+0x49/0xa0 [mac80211]
[ 823.467121] [<f8584585>] ieee80211_rx_h_action+0xeb/0x335 [mac80211]
[ 823.467157] [<f8585654>]
ieee80211_invoke_rx_handlers+0xe50/0x10d8 [mac80211]
[ 823.467193] [<f8585d46>]
__ieee80211_rx_handle_packet+0x46a/0x497 [mac80211]
[ 823.467229] [<f8586475>] ieee80211_rx+0x4d1/0x530 [mac80211]
[ 823.467263] [<f89936e3>] ath_rx_send_to_mac80211+0xa0/0xa8 [ath9k]
[ 823.467302] [<f899439e>] ath_rx_tasklet+0x7b6/0x7f5 [ath9k]
[ 823.467338] [<f8992115>] ath9k_tasklet+0x47/0xc7 [ath9k]
[ 823.467373] [<c102f4a1>] tasklet_action+0x8e/0xe1
[ 823.467391] [<c102f95b>] __do_softirq+0x8d/0x117
[ 823.467409]
[ 823.467412] -> #0 (&sta->lock){+.-...}:
[ 823.467430] [<c104ab2e>] __lock_acquire+0x8fd/0xb6d
[ 823.467447] [<c104adfa>] lock_acquire+0x5c/0x73
[ 823.467464] [<c132526f>] _spin_lock_bh+0x2a/0x39
[ 823.467481] [<f857bda4>]
sta_addba_resp_timer_expired+0x1b/0x50 [mac80211]
[ 823.467514] [<c1032f6d>] run_timer_softirq+0x170/0x1e5
[ 823.467531] [<c102f95b>] __do_softirq+0x8d/0x117
[ 823.467548]
[ 823.467551] other info that might help us debug this:
[ 823.467555]
[ 823.467566] 1 lock held by swapper/0:
[ 823.467574] #0:
(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer){+.-...}, at:
[<c1032f22>] run_timer_softirq+0x125/0x1e5
[ 823.467604]
[ 823.467607] stack backtrace:
[ 823.467619] Pid: 0, comm: swapper Not tainted 2.6.32-rc4-git1 #2
[ 823.467628] Call Trace:
[ 823.467643] [<c13233c8>] ? printk+0xf/0x11
[ 823.467659] [<c1049ef5>] print_circular_bug+0x8a/0x96
[ 823.467675] [<c104ab2e>] __lock_acquire+0x8fd/0xb6d
[ 823.467694] [<c104adfa>] lock_acquire+0x5c/0x73
[ 823.467725] [<f857bda4>] ? sta_addba_resp_timer_expired+0x1b/0x50 [mac80211]
[ 823.467742] [<c132526f>] _spin_lock_bh+0x2a/0x39
[ 823.467772] [<f857bda4>] ? sta_addba_resp_timer_expired+0x1b/0x50 [mac80211]
[ 823.467803] [<f857bda4>] sta_addba_resp_timer_expired+0x1b/0x50 [mac80211]
[ 823.467820] [<c1032f6d>] run_timer_softirq+0x170/0x1e5
[ 823.467836] [<c1032f22>] ? run_timer_softirq+0x125/0x1e5
[ 823.467866] [<f857bd89>] ? sta_addba_resp_timer_expired+0x0/0x50 [mac80211]
[ 823.467885] [<c102f95b>] __do_softirq+0x8d/0x117
[ 823.467901] [<c102f8ce>] ? __do_softirq+0x0/0x117
[ 823.467911] <IRQ> [<c102faf5>] ? irq_exit+0x38/0x75
[ 823.467939] [<c10045b1>] ? do_IRQ+0x88/0x9c
[ 823.467954] [<c1003175>] ? common_interrupt+0x35/0x3c
[ 823.467971] [<c104007b>] ? sched_clock_tick+0x31/0x77
[ 823.467989] [<c11b84ff>] ? acpi_idle_enter_bm+0x233/0x25e
[ 823.468008] [<c125c232>] ? cpuidle_idle_call+0x65/0x9b
[ 823.468023] [<c1001cd1>] ? cpu_idle+0xb9/0xe8
[ 823.468041] [<c131708b>] ? rest_init+0x67/0x69
[ 823.468058] [<c14e28e8>] ? start_kernel+0x3a3/0x3aa
[ 823.468076] [<c14e2098>] ? i386_start_kernel+0x98/0x9f
--
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