After collecting the wireshark log, I found this in my messages log:
Apr 3 09:22:12 whirligig kernel: [ 3987.336200]
=======================================================
Apr 3 09:22:12 whirligig kernel: [ 3987.336215] [ INFO: possible
circular locking dependency detected ]
Apr 3 09:22:12 whirligig kernel: [ 3987.336222] 2.6.25-rc8-mm1 #15
Apr 3 09:22:12 whirligig kernel: [ 3987.336227]
-------------------------------------------------------
Apr 3 09:22:12 whirligig kernel: [ 3987.336233] iw/9417 is trying to
acquire lock:
Apr 3 09:22:12 whirligig kernel: [ 3987.336630] (genl_mutex){--..},
at: [ctrl_dumpfamily+0x37/0xda] ctrl_dumpfamily+0x37/0xda
Apr 3 09:22:12 whirligig kernel: [ 3987.336654]
Apr 3 09:22:12 whirligig kernel: [ 3987.336656] but task is already
holding lock:
Apr 3 09:22:12 whirligig kernel: [ 3987.336661]
(nlk->cb_mutex){--..}, at: [netlink_dump+0x39/0x22e]
netlink_dump+0x39/0x22e
Apr 3 09:22:12 whirligig kernel: [ 3987.336682]
Apr 3 09:22:12 whirligig kernel: [ 3987.336684] which lock already
depends on the new lock.
Apr 3 09:22:12 whirligig kernel: [ 3987.336687]
Apr 3 09:22:12 whirligig kernel: [ 3987.336693]
Apr 3 09:22:12 whirligig kernel: [ 3987.336695] the existing
dependency chain (in reverse order) is:
Apr 3 09:22:12 whirligig kernel: [ 3987.336703]
Apr 3 09:22:12 whirligig kernel: [ 3987.336704] -> #1 (nlk->cb_mutex){--..}:
Apr 3 09:22:12 whirligig kernel: [ 3987.336717]
[__lock_acquire+0xa02/0xbaf] __lock_acquire+0xa02/0xbaf
Apr 3 09:22:12 whirligig kernel: [ 3987.336746]
[lock_acquire+0x76/0x9d] lock_acquire+0x76/0x9d
Apr 3 09:22:12 whirligig kernel: [ 3987.336772]
[snd_mixer_oss:mutex_lock_nested+0xd5/0x67b]
mutex_lock_nested+0xd5/0x274
Apr 3 09:22:12 whirligig kernel: [ 3987.336796]
[netlink_dump_start+0xbd/0x15a] netlink_dump_start+0xbd/0x15a
Apr 3 09:22:12 whirligig kernel: [ 3987.336821]
[genl_rcv_msg+0x9d/0x13a] genl_rcv_msg+0x9d/0x13a
Apr 3 09:22:12 whirligig kernel: [ 3987.336846]
[netlink_rcv_skb+0x30/0x75] netlink_rcv_skb+0x30/0x75
Apr 3 09:22:12 whirligig kernel: [ 3987.336874]
[genl_rcv+0x1e/0x2e] genl_rcv+0x1e/0x2e
Apr 3 09:22:12 whirligig kernel: [ 3987.336899]
[cfg80211:netlink_unicast+0x1c1/0x1867] netlink_unicast+0x1c1/0x293
Apr 3 09:22:12 whirligig kernel: [ 3987.336925]
[netlink_sendmsg+0x21f/0x22c] netlink_sendmsg+0x21f/0x22c
Apr 3 09:22:12 whirligig kernel: [ 3987.336950]
[sock_sendmsg+0xca/0xe1] sock_sendmsg+0xca/0xe1
Apr 3 09:22:12 whirligig kernel: [ 3987.336977]
[sys_sendmsg+0x14d/0x1a8] sys_sendmsg+0x14d/0x1a8
Apr 3 09:22:12 whirligig kernel: [ 3987.337003]
[sys_socketcall+0x163/0x17e] sys_socketcall+0x163/0x17e
Apr 3 09:22:12 whirligig kernel: [ 3987.337028]
[sysenter_past_esp+0x6d/0xc5] sysenter_past_esp+0x6d/0xc5
Apr 3 09:22:12 whirligig kernel: [ 3987.337057] [<ffffffff>] 0xffffffff
Apr 3 09:22:12 whirligig kernel: [ 3987.337264]
Apr 3 09:22:12 whirligig kernel: [ 3987.337266] -> #0 (genl_mutex){--..}:
Apr 3 09:22:12 whirligig kernel: [ 3987.337280]
[__lock_acquire+0x929/0xbaf] __lock_acquire+0x929/0xbaf
Apr 3 09:22:12 whirligig kernel: [ 3987.337305]
[lock_acquire+0x76/0x9d] lock_acquire+0x76/0x9d
Apr 3 09:22:12 whirligig kernel: [ 3987.337332]
[snd_mixer_oss:mutex_lock_nested+0xd5/0x67b]
mutex_lock_nested+0xd5/0x274
Apr 3 09:22:12 whirligig kernel: [ 3987.337358]
[ctrl_dumpfamily+0x37/0xda] ctrl_dumpfamily+0x37/0xda
Apr 3 09:22:12 whirligig kernel: [ 3987.337384]
[netlink_dump+0x51/0x22e] netlink_dump+0x51/0x22e
Apr 3 09:22:12 whirligig kernel: [ 3987.337409]
[netlink_recvmsg+0x156/0x203] netlink_recvmsg+0x156/0x203
Apr 3 09:22:12 whirligig kernel: [ 3987.337435]
[sock_recvmsg+0xd1/0xe9] sock_recvmsg+0xd1/0xe9
Apr 3 09:22:12 whirligig kernel: [ 3987.337460]
[sys_recvmsg+0xf2/0x17f] sys_recvmsg+0xf2/0x17f
Apr 3 09:22:12 whirligig kernel: [ 3987.337485]
[sys_socketcall+0x16f/0x17e] sys_socketcall+0x16f/0x17e
Apr 3 09:22:12 whirligig kernel: [ 3987.337511]
[sysenter_past_esp+0x6d/0xc5] sysenter_past_esp+0x6d/0xc5
Apr 3 09:22:12 whirligig kernel: [ 3987.337537] [<ffffffff>] 0xffffffff
Apr 3 09:22:12 whirligig kernel: [ 3987.337567]
Apr 3 09:22:12 whirligig kernel: [ 3987.337569] other info that might
help us debug this:
Apr 3 09:22:12 whirligig kernel: [ 3987.337572]
Apr 3 09:22:12 whirligig kernel: [ 3987.337579] 1 lock held by iw/9417:
Apr 3 09:22:12 whirligig kernel: [ 3987.337585] #0:
(nlk->cb_mutex){--..}, at: [netlink_dump+0x39/0x22e]
netlink_dump+0x39/0x22e
Apr 3 09:22:12 whirligig kernel: [ 3987.337609]
Apr 3 09:22:12 whirligig kernel: [ 3987.337611] stack backtrace:
Apr 3 09:22:12 whirligig kernel: [ 3987.337620] Pid: 9417, comm: iw
Not tainted 2.6.25-rc8-mm1 #15
Apr 3 09:22:12 whirligig kernel: [ 3987.337631]
[print_circular_bug_tail+0x5b/0x66] print_circular_bug_tail+0x5b/0x66
Apr 3 09:22:12 whirligig kernel: [ 3987.337649]
[print_circular_bug_header+0xa5/0xb0] ?
print_circular_bug_header+0xa5/0xb0
Apr 3 09:22:12 whirligig kernel: [ 3987.337673]
[__lock_acquire+0x929/0xbaf] __lock_acquire+0x929/0xbaf
Apr 3 09:22:12 whirligig kernel: [ 3987.337701]
[lock_acquire+0x76/0x9d] lock_acquire+0x76/0x9d
Apr 3 09:22:12 whirligig kernel: [ 3987.337718]
[ctrl_dumpfamily+0x37/0xda] ? ctrl_dumpfamily+0x37/0xda
Apr 3 09:22:12 whirligig kernel: [ 3987.337737]
[snd_mixer_oss:mutex_lock_nested+0xd5/0x67b]
mutex_lock_nested+0xd5/0x274
Apr 3 09:22:12 whirligig kernel: [ 3987.337750]
[ctrl_dumpfamily+0x37/0xda] ? ctrl_dumpfamily+0x37/0xda
Apr 3 09:22:12 whirligig kernel: [ 3987.337767]
[ctrl_dumpfamily+0x37/0xda] ? ctrl_dumpfamily+0x37/0xda
Apr 3 09:22:12 whirligig kernel: [ 3987.337788]
[ctrl_dumpfamily+0x37/0xda] ctrl_dumpfamily+0x37/0xda
Apr 3 09:22:12 whirligig kernel: [ 3987.337807]
[netlink_dump+0x51/0x22e] netlink_dump+0x51/0x22e
Apr 3 09:22:12 whirligig kernel: [ 3987.337820]
[mac80211:kfree_skb+0x40/0x45] ? kfree_skb+0x40/0x45
Apr 3 09:22:12 whirligig kernel: [ 3987.337839]
[netlink_recvmsg+0x156/0x203] netlink_recvmsg+0x156/0x203
Apr 3 09:22:12 whirligig kernel: [ 3987.337860]
[sock_sendmsg+0xca/0xe1] ? sock_sendmsg+0xca/0xe1
Apr 3 09:22:12 whirligig kernel: [ 3987.337880]
[sock_recvmsg+0xd1/0xe9] sock_recvmsg+0xd1/0xe9
Apr 3 09:22:12 whirligig kernel: [ 3987.337903] [<c01313d9>] ?
autoremove_wake_function+0x0/0x30
Apr 3 09:22:12 whirligig kernel: [ 3987.337939]
[snd_pcm_oss:copy_from_user+0x3b/0x236] ? copy_from_user+0x3b/0x5e
Apr 3 09:22:12 whirligig kernel: [ 3987.337959]
[verify_iovec+0x40/0x70] ? verify_iovec+0x40/0x70
Apr 3 09:22:12 whirligig kernel: [ 3987.337979]
[sys_recvmsg+0xf2/0x17f] sys_recvmsg+0xf2/0x17f
Apr 3 09:22:12 whirligig kernel: [ 3987.337997]
[snd_hda_intel:_spin_unlock_irqrestore+0x56/0x6c] ?
_spin_unlock_irqrestore+0x56/0x6c
Apr 3 09:22:12 whirligig kernel: [ 3987.338021]
[paravirt_get_lazy_mode+0xe/0x1b] ? paravirt_get_lazy_mode+0xe/0x1b
Apr 3 09:22:12 whirligig kernel: [ 3987.338040]
[crypto_algapi:kunmap_atomic+0x9e/0x2e8e] ? kunmap_atomic+0x9e/0xbb
Apr 3 09:22:12 whirligig kernel: [ 3987.338061]
[handle_mm_fault+0x7aa/0x7bb] ? handle_mm_fault+0x7aa/0x7bb
Apr 3 09:22:12 whirligig kernel: [ 3987.338100]
[sys_socketcall+0x16f/0x17e] sys_socketcall+0x16f/0x17e
Apr 3 09:22:12 whirligig kernel: [ 3987.338116]
[processor:trace_hardirqs_on+0xf0/0x5d38] ?
trace_hardirqs_on+0xf0/0x12c
Apr 3 09:22:12 whirligig kernel: [ 3987.338138]
[sysenter_past_esp+0x6d/0xc5] sysenter_past_esp+0x6d/0xc5
Apr 3 09:22:12 whirligig kernel: [ 3987.338163] =======================
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