This was encountered with the latest wireless-testing repo when the
iwl3945 module was unloaded.
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.25-rc8-wl #23
-------------------------------------------------------
rmmod/5589 is trying to acquire lock:
((name)){--..}, at: [<c012deec>] flush_workqueue+0x0/0x80
but task is already holding lock:
(rtnl_mutex){--..}, at: [<c02507ee>] rtnl_lock+0xf/0x11
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (rtnl_mutex){--..}:
[<c013c26e>] __lock_acquire+0x9c5/0xb72
[<c013c47e>] lock_acquire+0x63/0x80
[<c02b3296>] mutex_lock_nested+0xc2/0x231
[<c02507ee>] rtnl_lock+0xf/0x11
[<dca1ef61>] sta_info_debugfs_add_work+0xe7/0x100 [mac80211]
[<c012d8a4>] run_workqueue+0xbb/0x18b
[<c012e247>] worker_thread+0xb6/0xc2
[<c01306ec>] kthread+0x3b/0x63
[<c010577b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
-> #1 (&local->sta_debugfs_add){--..}:
[<c013c26e>] __lock_acquire+0x9c5/0xb72
[<c013c47e>] lock_acquire+0x63/0x80
[<c012d89f>] run_workqueue+0xb6/0x18b
[<c012e247>] worker_thread+0xb6/0xc2
[<c01306ec>] kthread+0x3b/0x63
[<c010577b>] kernel_thread_helper+0x7/0x10
[<ffffffff>] 0xffffffff
-> #0 ((name)){--..}:
[<c013c195>] __lock_acquire+0x8ec/0xb72
[<c013c47e>] lock_acquire+0x63/0x80
[<c012df2b>] flush_workqueue+0x3f/0x80
[<dca1ca89>] ieee80211_stop+0x2a5/0x366 [mac80211]
[<c0248266>] dev_close+0x45/0x5d
[<c02482f6>] rollback_registered+0x78/0xf3
[<c02483a8>] unregister_netdevice+0x37/0x73
[<dca27285>] __ieee80211_if_del+0x15/0x18 [mac80211]
[<dca1c382>] ieee80211_unregister_hw+0x72/0x125 [mac80211]
[<dca5e7c1>] iwl3945_pci_remove+0x29a/0x311 [iwl3945]
[<c01e37f3>] pci_device_remove+0x19/0x39
[<c0228874>] __device_release_driver+0x60/0x7d
[<c0228cc3>] driver_detach+0xa2/0xe3
[<c02282a6>] bus_remove_driver+0x63/0x7f
[<c0228d50>] driver_unregister+0x2a/0x2e
[<c01e39ac>] pci_unregister_driver+0x21/0x64
[<dca5e520>] iwl3945_exit+0x1c/0x23 [iwl3945]
[<c0143e93>] sys_delete_module+0x186/0x1cb
[<c0104a5e>] sysenter_past_esp+0x5f/0xa5
[<ffffffff>] 0xffffffff
other info that might help us debug this:
1 lock held by rmmod/5589:
#0: (rtnl_mutex){--..}, at: [<c02507ee>] rtnl_lock+0xf/0x11
stack backtrace:
Pid: 5589, comm: rmmod Not tainted 2.6.25-rc8-wl #23
[<c013a890>] print_circular_bug_tail+0x5b/0x66
[<c013a1da>] ? print_circular_bug_entry+0x39/0x43
[<c013c195>] __lock_acquire+0x8ec/0xb72
[<c013c47e>] lock_acquire+0x63/0x80
[<c012deec>] ? flush_workqueue+0x0/0x80
[<c012df2b>] flush_workqueue+0x3f/0x80
[<c012deec>] ? flush_workqueue+0x0/0x80
[<dca1ca89>] ieee80211_stop+0x2a5/0x366 [mac80211]
[<c02b43be>] ? _spin_unlock_bh+0x2f/0x32
[<c0248266>] dev_close+0x45/0x5d
[<c02482f6>] rollback_registered+0x78/0xf3
[<c02483a8>] unregister_netdevice+0x37/0x73
[<dca27285>] __ieee80211_if_del+0x15/0x18 [mac80211]
[<dca1c382>] ieee80211_unregister_hw+0x72/0x125 [mac80211]
[<dca5e7c1>] iwl3945_pci_remove+0x29a/0x311 [iwl3945]
[<c01e37f3>] pci_device_remove+0x19/0x39
[<c0228874>] __device_release_driver+0x60/0x7d
[<c0228cc3>] driver_detach+0xa2/0xe3
[<c02282a6>] bus_remove_driver+0x63/0x7f
[<c0228d50>] driver_unregister+0x2a/0x2e
[<c01e39ac>] pci_unregister_driver+0x21/0x64
[<dca5e520>] iwl3945_exit+0x1c/0x23 [iwl3945]
[<c0143e93>] sys_delete_module+0x186/0x1cb
[<c0133ab4>] ? up_read+0x16/0x2a
[<c0104b47>] ? restore_nocheck+0x12/0x15
[<c0104a5e>] sysenter_past_esp+0x5f/0xa5
=======================
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