What I had done was load mac80211_hwsim with the module parameters regtest=4 radios=2.
Then I spawn hostapd for wlan0, bring up wlan1, trigger a scan using iw, and then
I rename wlan1.
[ 1098.897030] =======================================================
[ 1098.897060] [ INFO: possible circular locking dependency detected ]
[ 1098.897081] 2.6.29-rc8-wl #23
[ 1098.897092] -------------------------------------------------------
[ 1098.897111] iw/6409 is trying to acquire lock:
[ 1098.897126] (cfg80211_mutex){--..}, at: [<ffffffffa03dd8b8>] cfg80211_dev_rename+0x28/0x1d0 [cfg80211]
[ 1098.897175]
[ 1098.897176] but task is already holding lock:
[ 1098.897196] (&drv->mtx){--..}, at: [<ffffffffa03ddbfb>] cfg80211_get_dev_from_info+0xfb/0x150 [cfg80211]
[ 1098.897240]
[ 1098.897241] which lock already depends on the new lock.
[ 1098.897242]
[ 1098.897268]
[ 1098.897269] the existing dependency chain (in reverse order) is:
[ 1098.897292]
[ 1098.897292] -> #1 (&drv->mtx){--..}:
[ 1098.897318] [<ffffffff8026e3dc>] __lock_acquire+0xeec/0x1370
[ 1098.897346] [<ffffffff8026e8b6>] lock_acquire+0x56/0x80
[ 1098.897391] [<ffffffff8053fc43>] __mutex_lock_common+0xa3/0x470
[ 1098.897430] [<ffffffff805400ea>] mutex_lock_nested+0x3a/0x50
[ 1098.897474] [<ffffffffa03ddbfb>] cfg80211_get_dev_from_info+0xfb/0x150 [cfg80211]
[ 1098.897537] [<ffffffffa03e4aef>] nl80211_new_interface+0x5f/0x1f0 [cfg80211]
[ 1098.897604] [<ffffffff804cb766>] genl_rcv_msg+0x1b6/0x1f0
[ 1098.897640] [<ffffffff804c99f9>] netlink_rcv_skb+0x89/0xb0
[ 1098.897684] [<ffffffff804cb599>] genl_rcv+0x29/0x40
[ 1098.897726] [<ffffffff804c979c>] netlink_unicast+0x2cc/0x2e0
[ 1098.897768] [<ffffffff804ca8d4>] netlink_sendmsg+0x214/0x300
[ 1098.897811] [<ffffffff8049dcb7>] sock_sendmsg+0x107/0x130
[ 1098.897855] [<ffffffff8049de25>] sys_sendmsg+0x145/0x280
[ 1098.897897] [<ffffffff8020c7db>] system_call_fastpath+0x16/0x1b
[ 1098.897942] [<ffffffffffffffff>] 0xffffffffffffffff
[ 1098.898014]
[ 1098.898015] -> #0 (cfg80211_mutex){--..}:
[ 1098.898067] [<ffffffff8026e4bb>] __lock_acquire+0xfcb/0x1370
[ 1098.898103] [<ffffffff8026e8b6>] lock_acquire+0x56/0x80
[ 1098.898144] [<ffffffff8053fc43>] __mutex_lock_common+0xa3/0x470
[ 1098.898187] [<ffffffff805400ea>] mutex_lock_nested+0x3a/0x50
[ 1098.898229] [<ffffffffa03dd8b8>] cfg80211_dev_rename+0x28/0x1d0 [cfg80211]
[ 1098.898291] [<ffffffffa03e4cc2>] nl80211_set_wiphy+0x42/0x300 [cfg80211]
[ 1098.898358] [<ffffffff804cb766>] genl_rcv_msg+0x1b6/0x1f0
[ 1098.898399] [<ffffffff804c99f9>] netlink_rcv_skb+0x89/0xb0
[ 1098.898441] [<ffffffff804cb599>] genl_rcv+0x29/0x40
[ 1098.898482] [<ffffffff804c979c>] netlink_unicast+0x2cc/0x2e0
[ 1098.898524] [<ffffffff804ca8d4>] netlink_sendmsg+0x214/0x300
[ 1098.898567] [<ffffffff8049dcb7>] sock_sendmsg+0x107/0x130
[ 1098.898618] [<ffffffff8049de25>] sys_sendmsg+0x145/0x280
[ 1098.898652] [<ffffffff8020c7db>] system_call_fastpath+0x16/0x1b
[ 1098.898697] [<ffffffffffffffff>] 0xffffffffffffffff
[ 1098.898734]
[ 1098.898735] other info that might help us debug this:
[ 1098.898736]
[ 1098.898804] 2 locks held by iw/6409:
[ 1098.898838] #0: (genl_mutex){--..}, at: [<ffffffff804cb58a>] genl_rcv+0x1a/0x40
[ 1098.898898] #1: (&drv->mtx){--..}, at: [<ffffffffa03ddbfb>] cfg80211_get_dev_from_info+0xfb/0x150 [cfg80211]
[ 1098.898981]
[ 1098.898981] stack backtrace:
[ 1098.899033] Pid: 6409, comm: iw Not tainted 2.6.29-rc8-wl #23
[ 1098.899072] Call Trace:
[ 1098.899108] [<ffffffff8026bf64>] print_circular_bug_tail+0xa4/0x100
[ 1098.899149] [<ffffffff8026e4bb>] __lock_acquire+0xfcb/0x1370
[ 1098.899188] [<ffffffff8026e8b6>] lock_acquire+0x56/0x80
[ 1098.899232] [<ffffffffa03dd8b8>] ? cfg80211_dev_rename+0x28/0x1d0 [cfg80211]
[ 1098.899273] [<ffffffff8053fc43>] __mutex_lock_common+0xa3/0x470
[ 1098.899317] [<ffffffffa03dd8b8>] ? cfg80211_dev_rename+0x28/0x1d0 [cfg80211]
[ 1098.899358] [<ffffffff8053fee1>] ? __mutex_lock_common+0x341/0x470
[ 1098.899401] [<ffffffffa03dd8b8>] ? cfg80211_dev_rename+0x28/0x1d0 [cfg80211]
[ 1098.899445] [<ffffffff805400ea>] mutex_lock_nested+0x3a/0x50
[ 1098.899482] [<ffffffffa03dd8b8>] cfg80211_dev_rename+0x28/0x1d0 [cfg80211]
[ 1098.899518] [<ffffffff8053f9b9>] ? mutex_unlock+0x9/0x10
[ 1098.899555] [<ffffffffa03e4cc2>] nl80211_set_wiphy+0x42/0x300 [cfg80211]
[ 1098.899596] [<ffffffff804cb238>] ? validate_nla+0xa8/0x1c0
[ 1098.899636] [<ffffffff804cb43f>] ? nla_parse+0xef/0x110
[ 1098.899668] [<ffffffff804cb766>] genl_rcv_msg+0x1b6/0x1f0
[ 1098.899700] [<ffffffff804cb5b0>] ? genl_rcv_msg+0x0/0x1f0
[ 1098.899733] [<ffffffff804c99f9>] netlink_rcv_skb+0x89/0xb0
[ 1098.899769] [<ffffffff804cb599>] genl_rcv+0x29/0x40
[ 1098.899799] [<ffffffff804c979c>] netlink_unicast+0x2cc/0x2e0
[ 1098.899845] [<ffffffff804a41ee>] ? __alloc_skb+0x6e/0x140
[ 1098.899876] [<ffffffff804ca8d4>] netlink_sendmsg+0x214/0x300
[ 1098.899922] [<ffffffff8029a8bd>] ? __rcu_read_unlock+0xad/0xd0
[ 1098.899954] [<ffffffff8049dcb7>] sock_sendmsg+0x107/0x130
[ 1098.899998] [<ffffffff80269604>] ? get_lock_stats+0x34/0x80
[ 1098.900039] [<ffffffff80259c70>] ? autoremove_wake_function+0x0/0x40
[ 1098.900073] [<ffffffff80269604>] ? get_lock_stats+0x34/0x80
[ 1098.900110] [<ffffffff8026965e>] ? put_lock_stats+0xe/0x30
[ 1098.900153] [<ffffffff8049d587>] ? move_addr_to_kernel+0x57/0x60
[ 1098.900193] [<ffffffff804a6f9f>] ? verify_iovec+0x3f/0xe0
[ 1098.900224] [<ffffffff8049de25>] sys_sendmsg+0x145/0x280
[ 1098.900260] [<ffffffff80269604>] ? get_lock_stats+0x34/0x80
[ 1098.900298] [<ffffffff8026965e>] ? put_lock_stats+0xe/0x30
[ 1098.900335] [<ffffffff8026d232>] ? trace_hardirqs_on_caller+0x162/0x1b0
[ 1098.900383] [<ffffffff80291f3f>] ? audit_syscall_entry+0x17f/0x1b0
[ 1098.900423] [<ffffffff8054162f>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 1098.900457] [<ffffffff8020c7db>] system_call_fastpath+0x16/0x1b
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