In yesterday's linux-tip I was able to provoke this backtrace by
repeatedly disabling and enabling the wifi on my EeePC 900:
[ 786.455830] uvcvideo 1-8:1.0: no reset_resume for driver uvcvideo?
[ 786.455835] uvcvideo 1-8:1.1: no reset_resume for driver uvcvideo?
[ 786.458642] uvcvideo: Found UVC 1.00 device CNF7129 (04f2:b071)
[ 786.485835] Restarting tasks ... <6>pciehp: Card not present on Slot(3)
[ 787.160420] done.
[ 787.197658] Trying to free already-free IRQ 18
[ 787.197726] Pid: 226, comm: pciehpd Not tainted
2.6.27-rc7-tipskw-00976-g30d1868-dirty #25
[ 787.197733] [<c01513b6>] free_irq+0xa6/0x130
[ 787.197749] [<c03ceb97>] ath5k_pci_remove+0x77/0xb0
[ 787.197759] [<c021f38e>] pci_device_remove+0x1e/0x40
[ 787.197770] [<c0298f2e>] __device_release_driver+0x5e/0x90
[ 787.197780] [<c0299038>] device_release_driver+0x28/0x40
[ 787.197788] [<c0298585>] bus_remove_device+0x65/0x80
[ 787.197796] [<c0296c21>] device_del+0x101/0x180
[ 787.197805] [<c0296cb0>] device_unregister+0x10/0x20
[ 787.197813] [<c021b88d>] pci_stop_dev+0x3d/0x50
[ 787.197820] [<c021b960>] pci_remove_bus_device+0x30/0xa0
[ 787.197829] [<c02287b9>] pciehp_unconfigure_device+0x99/0x190
[ 787.197840] [<c022744e>] pciehp_disable_slot+0x5e/0x240
[ 787.197848] [<c014a92b>] ? trace_hardirqs_on+0xb/0x10
[ 787.197858] [<c02279d8>] pciehp_power_thread+0x88/0xe0
[ 787.197867] [<c0136ac4>] ? run_workqueue+0xd4/0x1e0
[ 787.197877] [<c0136ac4>] ? run_workqueue+0xd4/0x1e0
[ 787.197886] [<c0136b26>] run_workqueue+0x136/0x1e0
[ 787.197894] [<c0136ac4>] ? run_workqueue+0xd4/0x1e0
[ 787.197902] [<c0227950>] ? pciehp_power_thread+0x0/0xe0
[ 787.197912] [<c013744b>] worker_thread+0x9b/0xf0
[ 787.197920] [<c013a390>] ? autoremove_wake_function+0x0/0x50
[ 787.197930] [<c01373b0>] ? worker_thread+0x0/0xf0
[ 787.197939] [<c0139fe6>] kthread+0x46/0x80
[ 787.197947] [<c0139fa0>] ? kthread+0x0/0x80
[ 787.197955] [<c010407b>] kernel_thread_helper+0x7/0x10
[ 787.197966] =======================
--
Sitsofe | http://sucs.org/~sits/
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