[16922.681811] =======================================================
[16922.681817] [ INFO: possible circular locking dependency detected ]
[16922.681821] 3.1.0-rc7-wl-65981-g1564861-dirty #244
[16922.681824] -------------------------------------------------------
[16922.681828] NetworkManager/11520 is trying to acquire lock:
[16922.681832] (rtnl_mutex){+.+.+.}, at: [<ffffffff813ddb17>] rtnl_lock+0x17/0x20
[16922.681845]
[16922.681846] but task is already holding lock:
[16922.681849] (rfkill_global_mutex){+.+.+.}, at: [<ffffffffa02a406d>] rfkill_fop_write+0x7d/0x170 [rfkill]
[16922.681862]
[16922.681863] which lock already depends on the new lock.
[16922.681864]
[16922.681867]
[16922.681868] the existing dependency chain (in reverse order) is:
[16922.681871]
[16922.681872] -> #4 (rfkill_global_mutex){+.+.+.}:
[16922.681880] [<ffffffff810897f8>] check_prevs_add+0xf8/0x180
[16922.681888] [<ffffffff81089d24>] validate_chain.isra.33+0x4a4/0x5d0
[16922.681895] [<ffffffff8108cb9c>] __lock_acquire+0x40c/0xa50
[16922.681901] [<ffffffff8108d94e>] lock_acquire+0x9e/0x1f0
[16922.681907] [<ffffffff814c56b3>] mutex_lock_nested+0x73/0x3b0
[16922.681913] [<ffffffffa02a36d5>] rfkill_fop_open+0x95/0x220 [rfkill]
[16922.681921] [<ffffffff81332f09>] misc_open+0x1e9/0x630
[16922.681928] [<ffffffff81129c37>] chrdev_open+0x127/0x330
[16922.681935] [<ffffffff81122ed1>] __dentry_open.isra.14+0x151/0x470
[16922.681942] [<ffffffff81124051>] nameidata_to_filp+0x61/0x70
[16922.681948] [<ffffffff811350bb>] do_last.isra.46+0x32b/0x650
[16922.681954] [<ffffffff8113560e>] path_openat+0xce/0x3a0
[16922.681959] [<ffffffff81135942>] do_filp_open+0x42/0xa0
[16922.681965] [<ffffffff81124157>] do_sys_open+0xf7/0x1d0
[16922.681970] [<ffffffff81124250>] sys_open+0x20/0x30
[16922.681976] [<ffffffff814cf30b>] system_call_fastpath+0x16/0x1b
[16922.681983]
[16922.681984] -> #3 (misc_mtx){+.+.+.}:
[16922.681990] [<ffffffff810897f8>] check_prevs_add+0xf8/0x180
[16922.681996] [<ffffffff81089d24>] validate_chain.isra.33+0x4a4/0x5d0
[16922.682003] [<ffffffff8108cb9c>] __lock_acquire+0x40c/0xa50
[16922.682008] [<ffffffff8108d94e>] lock_acquire+0x9e/0x1f0
[16922.682014] [<ffffffff814c56b3>] mutex_lock_nested+0x73/0x3b0
[16922.682020] [<ffffffff8133360b>] misc_register+0x2b/0x90
[16922.682026] [<ffffffff81335201>] hwrng_register+0x101/0x190
[16922.682031] [<ffffffffa04b2318>] b43_wireless_core_init+0x468/0x5e0 [b43]
[16922.682045] [<ffffffffa04b2aa8>] b43_op_start+0x1d8/0x1f0 [b43]
[16922.682056] [<ffffffffa041d68d>] ieee80211_do_open+0x27d/0x1160 [mac80211]
[16922.682082] [<ffffffffa041e5dd>] ieee80211_open+0x6d/0x80 [mac80211]
[16922.682102] [<ffffffff813d037f>] __dev_open+0x8f/0xe0
[16922.682108] [<ffffffff813d0621>] __dev_change_flags+0xa1/0x180
[16922.682114] [<ffffffff813d07b8>] dev_change_flags+0x28/0x70
[16922.682119] [<ffffffff813dded7>] do_setlink+0x267/0x7d0
[16922.682125] [<ffffffff813de509>] rtnl_setlink+0xc9/0x120
[16922.682130] [<ffffffff813de6a4>] rtnetlink_rcv_msg+0x124/0x2e0
[16922.682135] [<ffffffff813f74f9>] netlink_rcv_skb+0xa9/0xd0
[16922.682142] [<ffffffff813ddb45>] rtnetlink_rcv+0x25/0x40
[16922.682148] [<ffffffff813f6dde>] netlink_unicast+0x1ee/0x240
[16922.682153] [<ffffffff813f71ba>] netlink_sendmsg+0x2ca/0x360
[16922.682159] [<ffffffff813b3b4e>] sock_sendmsg+0xde/0x120
[16922.682166] [<ffffffff813b4035>] __sys_sendmsg+0x3b5/0x3d0
[16922.682171] [<ffffffff813b65e9>] sys_sendmsg+0x49/0x90
[16922.682177] [<ffffffff814cf30b>] system_call_fastpath+0x16/0x1b
[16922.682183]
[16922.682184] -> #2 (rng_mutex){+.+.+.}:
[16922.682191] [<ffffffff810897f8>] check_prevs_add+0xf8/0x180
[16922.682197] [<ffffffff81089d24>] validate_chain.isra.33+0x4a4/0x5d0
[16922.682203] [<ffffffff8108cb9c>] __lock_acquire+0x40c/0xa50
[16922.682209] [<ffffffff8108d94e>] lock_acquire+0x9e/0x1f0
[16922.682215] [<ffffffff814c56b3>] mutex_lock_nested+0x73/0x3b0
[16922.682220] [<ffffffff81335138>] hwrng_register+0x38/0x190
[16922.682226] [<ffffffffa04b2318>] b43_wireless_core_init+0x468/0x5e0 [b43]
[16922.682237] [<ffffffffa04b2aa8>] b43_op_start+0x1d8/0x1f0 [b43]
[16922.682248] [<ffffffffa041d68d>] ieee80211_do_open+0x27d/0x1160 [mac80211]
[16922.682268] [<ffffffffa041e5dd>] ieee80211_open+0x6d/0x80 [mac80211]
[16922.682287] [<ffffffff813d037f>] __dev_open+0x8f/0xe0
[16922.682293] [<ffffffff813d0621>] __dev_change_flags+0xa1/0x180
[16922.682298] [<ffffffff813d07b8>] dev_change_flags+0x28/0x70
[16922.682304] [<ffffffff813dded7>] do_setlink+0x267/0x7d0
[16922.682309] [<ffffffff813de509>] rtnl_setlink+0xc9/0x120
[16922.682315] [<ffffffff813de6a4>] rtnetlink_rcv_msg+0x124/0x2e0
[16922.682320] [<ffffffff813f74f9>] netlink_rcv_skb+0xa9/0xd0
[16922.682326] [<ffffffff813ddb45>] rtnetlink_rcv+0x25/0x40
[16922.682331] [<ffffffff813f6dde>] netlink_unicast+0x1ee/0x240
[16922.682337] [<ffffffff813f71ba>] netlink_sendmsg+0x2ca/0x360
[16922.682343] [<ffffffff813b3b4e>] sock_sendmsg+0xde/0x120
[16922.682349] [<ffffffff813b4035>] __sys_sendmsg+0x3b5/0x3d0
[16922.682354] [<ffffffff813b65e9>] sys_sendmsg+0x49/0x90
[16922.682360] [<ffffffff814cf30b>] system_call_fastpath+0x16/0x1b
[16922.682366]
[16922.682367] -> #1 (&wl->mutex){+.+.+.}:
[16922.682373] [<ffffffff810897f8>] check_prevs_add+0xf8/0x180
[16922.682380] [<ffffffff81089d24>] validate_chain.isra.33+0x4a4/0x5d0
[16922.682386] [<ffffffff8108cb9c>] __lock_acquire+0x40c/0xa50
[16922.682392] [<ffffffff8108d94e>] lock_acquire+0x9e/0x1f0
[16922.682398] [<ffffffff814c56b3>] mutex_lock_nested+0x73/0x3b0
[16922.682403] [<ffffffffa04b29ae>] b43_op_start+0xde/0x1f0 [b43]
[16922.682414] [<ffffffffa041d68d>] ieee80211_do_open+0x27d/0x1160 [mac80211]
[16922.682434] [<ffffffffa041e5dd>] ieee80211_open+0x6d/0x80 [mac80211]
[16922.682453] [<ffffffff813d037f>] __dev_open+0x8f/0xe0
[16922.682459] [<ffffffff813d0621>] __dev_change_flags+0xa1/0x180
[16922.682464] [<ffffffff813d07b8>] dev_change_flags+0x28/0x70
[16922.682470] [<ffffffff813dded7>] do_setlink+0x267/0x7d0
[16922.682475] [<ffffffff813de509>] rtnl_setlink+0xc9/0x120
[16922.682480] [<ffffffff813de6a4>] rtnetlink_rcv_msg+0x124/0x2e0
[16922.682486] [<ffffffff813f74f9>] netlink_rcv_skb+0xa9/0xd0
[16922.682492] [<ffffffff813ddb45>] rtnetlink_rcv+0x25/0x40
[16922.682497] [<ffffffff813f6dde>] netlink_unicast+0x1ee/0x240
[16922.682503] [<ffffffff813f71ba>] netlink_sendmsg+0x2ca/0x360
[16922.682509] [<ffffffff813b3b4e>] sock_sendmsg+0xde/0x120
[16922.682515] [<ffffffff813b4035>] __sys_sendmsg+0x3b5/0x3d0
[16922.682520] [<ffffffff813b65e9>] sys_sendmsg+0x49/0x90
[16922.682526] [<ffffffff814cf30b>] system_call_fastpath+0x16/0x1b
[16922.682532]
[16922.682533] -> #0 (rtnl_mutex){+.+.+.}:
[16922.682539] [<ffffffff810896e9>] check_prev_add+0x759/0x770
[16922.682545] [<ffffffff810897f8>] check_prevs_add+0xf8/0x180
[16922.682551] [<ffffffff81089d24>] validate_chain.isra.33+0x4a4/0x5d0
[16922.682557] [<ffffffff8108cb9c>] __lock_acquire+0x40c/0xa50
[16922.682563] [<ffffffff8108d94e>] lock_acquire+0x9e/0x1f0
[16922.682569] [<ffffffff814c56b3>] mutex_lock_nested+0x73/0x3b0
[16922.682574] [<ffffffff813ddb17>] rtnl_lock+0x17/0x20
[16922.682580] [<ffffffffa02ae6fd>] cfg80211_rfkill_set_block+0x3d/0xa0 [cfg80211]
[16922.682592] [<ffffffffa02a3e17>] rfkill_set_block+0x87/0x120 [rfkill]
[16922.682600] [<ffffffffa02a40db>] rfkill_fop_write+0xeb/0x170 [rfkill]
[16922.682607] [<ffffffff81124d92>] vfs_write+0xb2/0x180
[16922.682613] [<ffffffff811250bd>] sys_write+0x4d/0x90
[16922.682618] [<ffffffff814cf30b>] system_call_fastpath+0x16/0x1b
[16922.682624]
[16922.682625] other info that might help us debug this:
[16922.682626]
[16922.682629] Chain exists of:
[16922.682630] rtnl_mutex --> misc_mtx --> rfkill_global_mutex
[16922.682640]
[16922.682642] Possible unsafe locking scenario:
[16922.682644]
[16922.682646] CPU0 CPU1
[16922.682649] ---- ----
[16922.682652] lock(rfkill_global_mutex);
[16922.682657] lock(misc_mtx);
[16922.682662] lock(rfkill_global_mutex);
[16922.682667] lock(rtnl_mutex);
[16922.682672]
[16922.682673] *** DEADLOCK ***
[16922.682674]
[16922.682678] 1 lock held by NetworkManager/11520:
[16922.682681] #0: (rfkill_global_mutex){+.+.+.}, at: [<ffffffffa02a406d>] rfkill_fop_write+0x7d/0x170 [rfkill]
[16922.682693]
[16922.682694] stack backtrace:
[16922.682698] Pid: 11520, comm: NetworkManager Not tainted 3.1.0-rc7-wl-65981-g1564861-dirty #244
[16922.682702] Call Trace:
[16922.682709] [<ffffffff814b6d7f>] print_circular_bug+0xd9/0xea
[16922.682716] [<ffffffff810896e9>] check_prev_add+0x759/0x770
[16922.682723] [<ffffffff81079ed8>] ? sched_clock_cpu+0xa8/0x120
[16922.682729] [<ffffffff810897f8>] check_prevs_add+0xf8/0x180
[16922.682735] [<ffffffff81089d24>] validate_chain.isra.33+0x4a4/0x5d0
[16922.682742] [<ffffffff8108cb9c>] __lock_acquire+0x40c/0xa50
[16922.682748] [<ffffffff81079d45>] ? sched_clock_local+0x25/0x90
[16922.682755] [<ffffffff81009056>] ? native_sched_clock+0x26/0x70
[16922.682761] [<ffffffff8108d94e>] lock_acquire+0x9e/0x1f0
[16922.682766] [<ffffffff813ddb17>] ? rtnl_lock+0x17/0x20
[16922.682772] [<ffffffff814cad8e>] ? sub_preempt_count.part.150+0xe/0xa0
[16922.682779] [<ffffffff814c56b3>] mutex_lock_nested+0x73/0x3b0
[16922.682784] [<ffffffff813ddb17>] ? rtnl_lock+0x17/0x20
[16922.682789] [<ffffffff8108a775>] ? mark_held_locks+0x65/0x160
[16922.682797] [<ffffffffa02a3e08>] ? rfkill_set_block+0x78/0x120 [rfkill]
[16922.682802] [<ffffffff813ddb17>] ? rtnl_lock+0x17/0x20
[16922.682808] [<ffffffff814c7765>] ? _raw_spin_unlock_irqrestore+0x65/0x80
[16922.682814] [<ffffffff813ddb17>] rtnl_lock+0x17/0x20
[16922.682823] [<ffffffffa02ae6fd>] cfg80211_rfkill_set_block+0x3d/0xa0 [cfg80211]
[16922.682832] [<ffffffffa02a3e17>] rfkill_set_block+0x87/0x120 [rfkill]
[16922.682840] [<ffffffffa02a40db>] rfkill_fop_write+0xeb/0x170 [rfkill]
[16922.682846] [<ffffffff81124d92>] vfs_write+0xb2/0x180
[16922.682851] [<ffffffff811250bd>] sys_write+0x4d/0x90
[16922.682856] [<ffffffff814cf30b>] system_call_fastpath+0x16/0x1b
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