Running "iw dev wlan0 scan trigger" resulted in the message below. This
is on the latest wireless-testing and iw. It only happened the first
time I triggered the scan.
[ 450.148335] =======================================================
[ 450.148453] [ INFO: possible circular locking dependency detected ]
[ 450.148521] 2.6.29-rc4-wl #22
[ 450.148586] -------------------------------------------------------
[ 450.148651] iw/6265 is trying to acquire lock:
[ 450.148711] (rtnl_mutex){--..}, at: [<ffffffff804414c2>] rtnl_lock+0x12/0x20
[ 450.148898]
[ 450.148899] but task is already holding lock:
[ 450.149008] (&drv->mtx){--..}, at: [<ffffffffa018e68b>] cfg80211_get_dev_from_ifindex+0x5b/0x80 [cfg80211]
[ 450.149221]
[ 450.149222] which lock already depends on the new lock.
[ 450.149224]
[ 450.149384]
[ 450.149385] the existing dependency chain (in reverse order) is:
[ 450.149498]
[ 450.149499] -> #2 (&drv->mtx){--..}:
[ 450.149717] [<ffffffff8026146f>] validate_chain+0xc1f/0x1270
[ 450.149825] [<ffffffff80261dde>] __lock_acquire+0x31e/0xa30
[ 450.149929] [<ffffffff80262548>] lock_acquire+0x58/0x80
[ 450.150032] [<ffffffff804c523d>] mutex_lock_nested+0x9d/0x2f0
[ 450.150138] [<ffffffffa018e68b>] cfg80211_get_dev_from_ifindex+0x5b/0x80 [cfg80211]
[ 450.150265] [<ffffffffa0191d08>] cfg80211_wext_siwscan+0x58/0x210 [cfg80211]
[ 450.150392] [<ffffffff804b0423>] ioctl_standard_call+0x1a3/0x390
[ 450.150498] [<ffffffff804aff31>] wext_handle_ioctl+0xf1/0x220
[ 450.150602] [<ffffffff80437be9>] dev_ioctl+0x559/0x5b0
[ 450.150706] [<ffffffff80425aa5>] sock_ioctl+0xe5/0x260
[ 450.150810] [<ffffffff802d12b1>] vfs_ioctl+0x31/0x90
[ 450.150913] [<ffffffff802d1640>] do_vfs_ioctl+0x330/0x540
[ 450.151015] [<ffffffff802d18d2>] sys_ioctl+0x82/0xa0
[ 450.151117] [<ffffffff8020c35b>] system_call_fastpath+0x16/0x1b
[ 450.151223] [<ffffffffffffffff>] 0xffffffffffffffff
[ 450.151330]
[ 450.151332] -> #1 (cfg80211_drv_mutex){--..}:
[ 450.151551] [<ffffffff8026146f>] validate_chain+0xc1f/0x1270
[ 450.151656] [<ffffffff80261dde>] __lock_acquire+0x31e/0xa30
[ 450.151759] [<ffffffff80262548>] lock_acquire+0x58/0x80
[ 450.151861] [<ffffffff804c523d>] mutex_lock_nested+0x9d/0x2f0
[ 450.151965] [<ffffffffa018e64e>] cfg80211_get_dev_from_ifindex+0x1e/0x80 [cfg80211]
[ 450.152010] [<ffffffffa0191d08>] cfg80211_wext_siwscan+0x58/0x210 [cfg80211]
[ 450.152010] [<ffffffff804b0423>] ioctl_standard_call+0x1a3/0x390
[ 450.152010] [<ffffffff804aff31>] wext_handle_ioctl+0xf1/0x220
[ 450.152010] [<ffffffff80437be9>] dev_ioctl+0x559/0x5b0
[ 450.152010] [<ffffffff80425aa5>] sock_ioctl+0xe5/0x260
[ 450.152010] [<ffffffff802d12b1>] vfs_ioctl+0x31/0x90
[ 450.152010] [<ffffffff802d1640>] do_vfs_ioctl+0x330/0x540
[ 450.152010] [<ffffffff802d18d2>] sys_ioctl+0x82/0xa0
[ 450.152010] [<ffffffff8020c35b>] system_call_fastpath+0x16/0x1b
[ 450.152010] [<ffffffffffffffff>] 0xffffffffffffffff
[ 450.152010]
[ 450.152010] -> #0 (rtnl_mutex){--..}:
[ 450.152010] [<ffffffff80261020>] validate_chain+0x7d0/0x1270
[ 450.152010] [<ffffffff80261dde>] __lock_acquire+0x31e/0xa30
[ 450.152010] [<ffffffff80262548>] lock_acquire+0x58/0x80
[ 450.152010] [<ffffffff804c523d>] mutex_lock_nested+0x9d/0x2f0
[ 450.152010] [<ffffffff804414c2>] rtnl_lock+0x12/0x20
[ 450.152010] [<ffffffffa0194c12>] nl80211_trigger_scan+0x52/0x490 [cfg80211]
[ 450.152010] [<ffffffff80453bc1>] genl_rcv_msg+0x181/0x1c0
[ 450.152010] [<ffffffff804509f9>] netlink_rcv_skb+0x89/0xb0
[ 450.152010] [<ffffffff80452f39>] genl_rcv+0x29/0x40
[ 450.152010] [<ffffffff8045077f>] netlink_unicast+0x27f/0x2c0
[ 450.152010] [<ffffffff80450fe1>] netlink_sendmsg+0x231/0x2e0
[ 450.152010] [<ffffffff80426797>] sock_sendmsg+0x127/0x140
[ 450.152010] [<ffffffff804268f2>] sys_sendmsg+0x142/0x260
[ 450.152010] [<ffffffff8020c35b>] system_call_fastpath+0x16/0x1b
[ 450.152010] [<ffffffffffffffff>] 0xffffffffffffffff
[ 450.152010]
[ 450.152010] other info that might help us debug this:
[ 450.152010]
[ 450.152010] 2 locks held by iw/6265:
[ 450.152010] #0: (genl_mutex){--..}, at: [<ffffffff80452f2a>] genl_rcv+0x1a/0x40
[ 450.152010] #1: (&drv->mtx){--..}, at: [<ffffffffa018e68b>] cfg80211_get_dev_from_ifindex+0x5b/0x80 [cfg80211]
[ 450.152010]
[ 450.152010] stack backtrace:
[ 450.152010] Pid: 6265, comm: iw Not tainted 2.6.29-rc4-wl #22
[ 450.152010] Call Trace:
[ 450.152010] [<ffffffff80260805>] print_circular_bug_tail+0x95/0xe0
[ 450.152010] [<ffffffff80261020>] validate_chain+0x7d0/0x1270
[ 450.152010] [<ffffffff80261dde>] ? __lock_acquire+0x31e/0xa30
[ 450.152010] [<ffffffff80261dde>] __lock_acquire+0x31e/0xa30
[ 450.152010] [<ffffffff804414c2>] ? rtnl_lock+0x12/0x20
[ 450.152010] [<ffffffff80262548>] lock_acquire+0x58/0x80
[ 450.152010] [<ffffffff804414c2>] ? rtnl_lock+0x12/0x20
[ 450.152010] [<ffffffff804c523d>] mutex_lock_nested+0x9d/0x2f0
[ 450.152010] [<ffffffff804414c2>] ? rtnl_lock+0x12/0x20
[ 450.152010] [<ffffffffa018e69e>] ? cfg80211_get_dev_from_ifindex+0x6e/0x80 [cfg80211]
[ 450.152010] [<ffffffff804414c2>] rtnl_lock+0x12/0x20
[ 450.152010] [<ffffffffa0194c12>] nl80211_trigger_scan+0x52/0x490 [cfg80211]
[ 450.152010] [<ffffffff80453bc1>] genl_rcv_msg+0x181/0x1c0
[ 450.152010] [<ffffffff80453a40>] ? genl_rcv_msg+0x0/0x1c0
[ 450.152010] [<ffffffff804509f9>] netlink_rcv_skb+0x89/0xb0
[ 450.152010] [<ffffffff80452f39>] genl_rcv+0x29/0x40
[ 450.152010] [<ffffffff804505e8>] ? netlink_unicast+0xe8/0x2c0
[ 450.152010] [<ffffffff8045077f>] netlink_unicast+0x27f/0x2c0
[ 450.152010] [<ffffffff8042e159>] ? __alloc_skb+0x89/0x140
[ 450.152010] [<ffffffff80450fe1>] netlink_sendmsg+0x231/0x2e0
[ 450.152010] [<ffffffff80426797>] sock_sendmsg+0x127/0x140
[ 450.152010] [<ffffffff8024f400>] ? autoremove_wake_function+0x0/0x40
[ 450.152010] [<ffffffff8029a725>] ? get_page_from_freelist+0x485/0x590
[ 450.152010] [<ffffffff8026004a>] ? trace_hardirqs_on_caller+0x15a/0x1b0
[ 450.152010] [<ffffffff802600ad>] ? trace_hardirqs_on+0xd/0x10
[ 450.152010] [<ffffffff8029a648>] ? get_page_from_freelist+0x3a8/0x590
[ 450.152010] [<ffffffff80427357>] ? move_addr_to_kernel+0x57/0x60
[ 450.152010] [<ffffffff8043017c>] ? verify_iovec+0x3c/0xc0
[ 450.152010] [<ffffffff804268f2>] sys_sendmsg+0x142/0x260
[ 450.152010] [<ffffffff804c72f5>] ? _spin_unlock_irqrestore+0x55/0x60
[ 450.152010] [<ffffffff8026004a>] ? trace_hardirqs_on_caller+0x15a/0x1b0
[ 450.152010] [<ffffffff802600ad>] ? trace_hardirqs_on+0xd/0x10
[ 450.152010] [<ffffffff80368c36>] ? __up_read+0x46/0xb0
[ 450.152010] [<ffffffff802530f6>] ? up_read+0x26/0x30
[ 450.152010] [<ffffffff8026004a>] ? trace_hardirqs_on_caller+0x15a/0x1b0
[ 450.152010] [<ffffffff804c6911>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 450.152010] [<ffffffff8020c35b>] system_call_fastpath+0x16/0x1b
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