* Pavel Vasilyev | 2013-12-13 00:29:52 [+0400]: >On startup, if USB webcam (uvcvideo) attached in usb-hole > >NMI backtrace for cpu 0 >CPU: 0 PID: 35 Comm: irq/43-xhci_hcd Not tainted 3.12.5-plx #6 > [<c13aa59c>] xhci_queue_isoc_tx_prepare+0x39c/0x950 > [<c139d35f>] xhci_urb_enqueue+0x22f/0x540 > [<c1375745>] usb_hcd_submit_urb+0x65/0x280 > [<c13777a0>] usb_submit_urb+0x170/0x3a0 > [<c13e1ee8>] uvc_video_complete+0xb8/0xd0 > [<c1374625>] __usb_hcd_giveback_urb+0x45/0xa0 > [<c1374bd8>] usb_hcd_giveback_urb+0x38/0xf0 > [<c13a84cf>] handle_tx_event+0x3af/0xda0 > [<c13a9082>] xhci_irq+0x1a2/0x6c0 > [<c13a95aa>] xhci_msi_irq+0xa/0x10 > [<c1084c31>] irq_forced_thread_fn+0x21/0x70 > [<c1085046>] irq_thread+0x106/0x220 > [<c1057110>] kthread+0xd0/0xe0 > [<c15083b7>] ret_from_kernel_thread+0x1b/0x28 This looks like uvc is resubmitting the URB on completion. Nothing unusual. Howver it seems that then CPU gets stuck in xhci_queue_isoc_tx_prepare() for some reason. Could you try map c13aa59c to the source line? Something like addr2lin -e xhci-hcd.ko -i c13aa59c should do the trick but of the module of this trace. What does the -plx stand for in localversion? Do you have any custom patches on your kernel? Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
