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Date: Fri, 10 Jun 2011 16:37:44 -0400
From: Miles Lane <miles.lane@...il.com>
To: LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Johannes Berg <johannes@...solutions.net>
Subject: 3.0.0-rc2-git4 -- INFO: possible circular locking dependency detected
[ 330.762815] [ INFO: possible circular locking dependency detected ]
[ 330.762819] 3.0.0-rc2-git4 #9
[ 330.762822] -------------------------------------------------------
[ 330.762825] kworker/0:0/4 is trying to acquire lock:
[ 330.762828] (&rdev->mtx){+.+.+.}, at: [<ffffffffa006f7e0>]
cfg80211_netdev_notifier_call+0x275/0x4ff [cfg80211]
[ 330.762845]
[ 330.762846] but task is already holding lock:
[ 330.762848] (&rdev->devlist_mtx){+.+.+.}, at: [<ffffffffa006fd5c>]
cfg80211_rfkill_set_block+0x28/0x70 [cfg80211]
[ 330.762860]
[ 330.762861] which lock already depends on the new lock.
[ 330.762863]
[ 330.762865]
[ 330.762866] the existing dependency chain (in reverse order) is:
[ 330.762869]
[ 330.762870] -> #1 (&rdev->devlist_mtx){+.+.+.}:
[ 330.762875] [<ffffffff81066aaa>] lock_acquire+0xda/0xff
[ 330.762884] [<ffffffff813f25ba>] __mutex_lock_common+0x47/0x31d
[ 330.762891] [<ffffffff813f298b>] mutex_lock_nested+0x3b/0x40
[ 330.762896] [<ffffffffa006f8f0>]
cfg80211_netdev_notifier_call+0x385/0x4ff [cfg80211]
[ 330.762906] [<ffffffff813f6d0e>] notifier_call_chain.isra.2+0x7c/0xb3
[ 330.762912] [<ffffffff81057893>] raw_notifier_call_chain+0x12/0x14
[ 330.762918] [<ffffffff81351a86>] call_netdevice_notifiers+0x45/0x4a
[ 330.762925] [<ffffffff81357091>] __dev_notify_flags+0x32/0x56
[ 330.762930] [<ffffffff813570f8>] dev_change_flags+0x43/0x4f
[ 330.762936] [<ffffffff81362793>] do_setlink+0x2ab/0x774
[ 330.762941] [<ffffffff81362eb3>] rtnl_setlink+0xc8/0xe8
[ 330.762946] [<ffffffff813631b2>] rtnetlink_rcv_msg+0x1e8/0x1fe
[ 330.762952] [<ffffffff8137564f>] netlink_rcv_skb+0x3e/0x8a
[ 330.762958] [<ffffffff813622e4>] rtnetlink_rcv+0x21/0x28
[ 330.762963] [<ffffffff8137514f>] netlink_unicast+0xe7/0x151
[ 330.762968] [<ffffffff81375448>] netlink_sendmsg+0x28f/0x2d0
[ 330.762973] [<ffffffff813422aa>] sock_sendmsg+0xe1/0x104
[ 330.762980] [<ffffffff81343ea5>] __sys_sendmsg+0x1d9/0x25d
[ 330.762985] [<ffffffff8134502d>] sys_sendmsg+0x3d/0x5b
[ 330.762990] [<ffffffff813f9fbb>] system_call_fastpath+0x16/0x1b
[ 330.762996]
[ 330.762997] -> #0 (&rdev->mtx){+.+.+.}:
[ 330.763003] [<ffffffff8106631a>] __lock_acquire+0xa5e/0xd52
[ 330.763008] [<ffffffff81066aaa>] lock_acquire+0xda/0xff
[ 330.763013] [<ffffffff813f25ba>] __mutex_lock_common+0x47/0x31d
[ 330.763019] [<ffffffff813f298b>] mutex_lock_nested+0x3b/0x40
[ 330.763024] [<ffffffffa006f7e0>]
cfg80211_netdev_notifier_call+0x275/0x4ff [cfg80211]
[ 330.763033] [<ffffffff813f6d0e>] notifier_call_chain.isra.2+0x7c/0xb3
[ 330.763039] [<ffffffff81057893>] raw_notifier_call_chain+0x12/0x14
[ 330.763044] [<ffffffff81351a86>] call_netdevice_notifiers+0x45/0x4a
[ 330.763049] [<ffffffff81351ae5>] __dev_close_many+0x5a/0xd1
[ 330.763054] [<ffffffff81351c1a>] dev_close_many+0x7a/0xea
[ 330.763059] [<ffffffff81354abf>] dev_close+0x38/0x49
[ 330.763064] [<ffffffffa006fd7a>]
cfg80211_rfkill_set_block+0x46/0x70 [cfg80211]
[ 330.763073] [<ffffffffa001acbd>] rfkill_set_block+0x80/0xf1 [rfkill]
[ 330.763081] [<ffffffffa001ae84>]
__rfkill_switch_all+0x3c/0x62 [rfkill]
[ 330.763089] [<ffffffffa001b3db>] rfkill_switch_all+0x38/0x49 [rfkill]
[ 330.763096] [<ffffffffa001b618>]
rfkill_op_handler+0x104/0x135 [rfkill]
[ 330.763104] [<ffffffff8104e564>] process_one_work+0x1c8/0x353
[ 330.763109] [<ffffffff8104f70b>] worker_thread+0xd5/0x159
[ 330.763115] [<ffffffff81052c82>] kthread+0x9a/0xa2
[ 330.763120] [<ffffffff813fb114>] kernel_thread_helper+0x4/0x10
[ 330.763126]
[ 330.763127] other info that might help us debug this:
[ 330.763128]
[ 330.763131] Possible unsafe locking scenario:
[ 330.763132]
[ 330.763134] CPU0 CPU1
[ 330.763136] ---- ----
[ 330.763139] lock(&rdev->devlist_mtx);
[ 330.763143] lock(&rdev->mtx);
[ 330.763147] lock(&rdev->devlist_mtx);
[ 330.763151] lock(&rdev->mtx);
[ 330.763155]
[ 330.763156] *** DEADLOCK ***
[ 330.763157]
[ 330.763160] 5 locks held by kworker/0:0/4:
[ 330.763163] #0: (events){.+.+.+}, at: [<ffffffff8104e4c7>]
process_one_work+0x12b/0x353
[ 330.763172] #1: ((rfkill_op_work).work){+.+...}, at:
[<ffffffff8104e4c7>] process_one_work+0x12b/0x353
[ 330.763181] #2: (rfkill_global_mutex){+.+.+.}, at:
[<ffffffffa001b3c7>] rfkill_switch_all+0x24/0x49 [rfkill]
[ 330.763191] #3: (rtnl_mutex){+.+.+.}, at: [<ffffffff813622c1>]
rtnl_lock+0x12/0x14
[ 330.763201] #4: (&rdev->devlist_mtx){+.+.+.}, at:
[<ffffffffa006fd5c>] cfg80211_rfkill_set_block+0x28/0x70 [cfg80211]
[ 330.763214]
[ 330.763214] stack backtrace:
[ 330.763218] Pid: 4, comm: kworker/0:0 Not tainted 3.0.0-rc2-git4 #9
[ 330.763221] Call Trace:
[ 330.763228] [<ffffffff813eb618>] print_circular_bug+0x1f8/0x209
[ 330.763234] [<ffffffff8106631a>] __lock_acquire+0xa5e/0xd52
[ 330.763245] [<ffffffffa006f7e0>] ?
cfg80211_netdev_notifier_call+0x275/0x4ff [cfg80211]
[ 330.763251] [<ffffffff81066aaa>] lock_acquire+0xda/0xff
[ 330.763260] [<ffffffffa006f7e0>] ?
cfg80211_netdev_notifier_call+0x275/0x4ff [cfg80211]
[ 330.763267] [<ffffffff813f25ba>] __mutex_lock_common+0x47/0x31d
[ 330.763271] [<ffffffffa006f7e0>] ?
cfg80211_netdev_notifier_call+0x275/0x4ff [cfg80211]
[ 330.763271] [<ffffffffa006f7e0>] ?
cfg80211_netdev_notifier_call+0x275/0x4ff [cfg80211]
[ 330.763271] [<ffffffffa006f56b>] ? cfg80211_unlock_rdev+0x1f/0x1f [cfg80211]
[ 330.763271] [<ffffffff813f298b>] mutex_lock_nested+0x3b/0x40
[ 330.763271] [<ffffffffa006f7e0>]
cfg80211_netdev_notifier_call+0x275/0x4ff [cfg80211]
[ 330.763271] [<ffffffff813f6d0e>] notifier_call_chain.isra.2+0x7c/0xb3
[ 330.763271] [<ffffffff81057893>] raw_notifier_call_chain+0x12/0x14
[ 330.763271] [<ffffffff81351a86>] call_netdevice_notifiers+0x45/0x4a
[ 330.763271] [<ffffffff81351ae5>] __dev_close_many+0x5a/0xd1
[ 330.763271] [<ffffffff81351c1a>] dev_close_many+0x7a/0xea
[ 330.763271] [<ffffffff81354abf>] dev_close+0x38/0x49
[ 330.763271] [<ffffffffa006fd7a>]
cfg80211_rfkill_set_block+0x46/0x70 [cfg80211]
[ 330.763271] [<ffffffffa001acbd>] rfkill_set_block+0x80/0xf1 [rfkill]
[ 330.763271] [<ffffffffa001ae84>] __rfkill_switch_all+0x3c/0x62 [rfkill]
[ 330.763271] [<ffffffffa001b3db>] rfkill_switch_all+0x38/0x49 [rfkill]
[ 330.763271] [<ffffffffa001b618>] rfkill_op_handler+0x104/0x135 [rfkill]
[ 330.763271] [<ffffffff8104e564>] process_one_work+0x1c8/0x353
[ 330.763271] [<ffffffff8104e4c7>] ? process_one_work+0x12b/0x353
[ 330.763271] [<ffffffffa001b514>] ?
rfkill_get_global_sw_state+0x12/0x12 [rfkill]
[ 330.763271] [<ffffffff8104f70b>] worker_thread+0xd5/0x159
[ 330.763271] [<ffffffff8104f636>] ? manage_workers.isra.22+0x16a/0x16a
[ 330.763271] [<ffffffff81052c82>] kthread+0x9a/0xa2
[ 330.763271] [<ffffffff813fb114>] kernel_thread_helper+0x4/0x10
[ 330.763271] [<ffffffff81029bdb>] ? finish_task_switch+0x42/0xbb
[ 330.763271] [<ffffffff8100164b>] ? __switch_to+0xbc/0x1fb
[ 330.763271] [<ffffffff813f3e40>] ? retint_restore_args+0xe/0xe
[ 330.763271] [<ffffffff81052be8>] ? __init_kthread_worker+0x55/0x55
[ 330.763271] [<ffffffff813fb110>] ? gs_change+0xb/0xb
--
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