[    9.556132] irq 75: nobody cared (try booting with the "irqpoll" option)
[    9.562890] Backtrace:
[    9.565478] [<c0013298>] (dump_backtrace+0x0/0x114) from [<c04f6a30>] (dump_stack+0x20/0x24)
[    9.573946]  r6:c06aeeec r5:00000000 r4:c06aeeb4 r3:c06a7e94
[    9.579811] [<c04f6a10>] (dump_stack+0x0/0x24) from [<c0093644>] (__report_bad_irq.isra.6+0x30/0x160)
[    9.589082] [<c0093614>] (__report_bad_irq.isra.6+0x0/0x160) from [<c0093968>] (note_interrupt+0x17c/0x254)
[    9.598847]  r6:0000004b r5:00000000 r4:c06aeeb4 r3:00000000
[    9.604704] [<c00937ec>] (note_interrupt+0x0/0x254) from [<c0091458>] (handle_irq_event_percpu+0x180/0x38c)
[    9.614488] [<c00912d8>] (handle_irq_event_percpu+0x0/0x38c) from [<c00916d8>] (handle_irq_event+0x74/0xa8)
[    9.624274] [<c0091664>] (handle_irq_event+0x0/0xa8) from [<c0094e1c>] (handle_level_irq+0x8c/0x120)
[    9.633428]  r6:c06b8fec r5:cda24008 r4:c06aeeb4 r3:00020000
[    9.639280] [<c0094d90>] (handle_level_irq+0x0/0x120) from [<c0090b30>] (generic_handle_irq+0x2c/0x40)
[    9.648609]  r5:0000004b r4:c06c79d4
[    9.652315] [<c0090b04>] (generic_handle_irq+0x0/0x40) from [<c000f608>] (handle_IRQ+0x40/0x94)
[    9.661069] [<c000f5c8>] (handle_IRQ+0x0/0x94) from [<c0018e30>] (__ipipe_do_IRQ+0x1c/0x24)
[    9.669443]  r6:00000000 r5:0000004c r4:0000004b r3:c07300c0
[    9.675312] [<c0018e14>] (__ipipe_do_IRQ+0x0/0x24) from [<c009c008>] (__ipipe_do_sync_stage+0x1e4/0x2cc)
[    9.684841] [<c009be24>] (__ipipe_do_sync_stage+0x0/0x2cc) from [<c009c598>] (ipipe_unstall_root+0x70/0x78)
[    9.694626] [<c009c528>] (ipipe_unstall_root+0x0/0x78) from [<c002e024>] (__do_softirq+0x70/0x2e8)
[    9.703629] [<c002dfb4>] (__do_softirq+0x0/0x2e8) from [<c002e704>] (irq_exit+0xac/0xb4)
[    9.711771] [<c002e658>] (irq_exit+0x0/0xb4) from [<c000f60c>] (handle_IRQ+0x44/0x94)
[    9.719625]  r4:c06c79d4 r3:00000002
[    9.723328] [<c000f5c8>] (handle_IRQ+0x0/0x94) from [<c0018e30>] (__ipipe_do_IRQ+0x1c/0x24)
[    9.731702]  r6:00000004 r5:00000004 r4:00000003 r3:c072f7c0
[    9.737565] [<c0018e14>] (__ipipe_do_IRQ+0x0/0x24) from [<c009c008>] (__ipipe_do_sync_stage+0x1e4/0x2cc)
[    9.747094] [<c009be24>] (__ipipe_do_sync_stage+0x0/0x2cc) from [<c009c598>] (ipipe_unstall_root+0x70/0x78)
[    9.756880] [<c009c528>] (ipipe_unstall_root+0x0/0x78) from [<c00989c4>] (rcu_preempt_note_context_switch+0xb8/0x114)
[    9.767553] [<c009890c>] (rcu_preempt_note_context_switch+0x0/0x114) from [<c04fba14>] (__schedule+0x58/0x794)
[    9.777575]  r7:cda24038 r6:c06ab328 r5:4dbc35e0 r4:cda24000
[    9.783434] [<c04fb9bc>] (__schedule+0x0/0x794) from [<c04fc34c>] (preempt_schedule+0x70/0xa4)
[    9.792111] [<c04fc2dc>] (preempt_schedule+0x0/0xa4) from [<c03d2058>] (DWC_SPINUNLOCK_IRQRESTORE+0x58/0x5c)
[    9.801961]  r4:00000000 r3:00000002
[    9.805689] [<c03d2000>] (DWC_SPINUNLOCK_IRQRESTORE+0x0/0x5c) from [<c03c95ec>] (dwc_otg_urb_enqueue+0x1b8/0x2ec)
[    9.816011] [<c03c9434>] (dwc_otg_urb_enqueue+0x0/0x2ec) from [<c039f36c>] (usb_hcd_submit_urb+0xc0/0x8f4)
[    9.825716] [<c039f2ac>] (usb_hcd_submit_urb+0x0/0x8f4) from [<c03a1260>] (usb_submit_urb+0x150/0x320)
[    9.835072] [<c03a1110>] (usb_submit_urb+0x0/0x320) from [<c03a19f8>] (usb_start_wait_urb+0x54/0xcc)
[    9.844225]  r8:00001388 r7:cda25e24 r6:00000000 r5:cda25de0 r4:cdbb6be0
r3:cdbb6be0
[    9.852321] [<c03a19a4>] (usb_start_wait_urb+0x0/0xcc) from [<c03a1b40>] (usb_control_msg+0xd0/0x108)
[    9.861561]  r8:80000080 r7:00000100 r6:00000000 r5:00000040 r4:cdbc35e0
[    9.868493] [<c03a1a70>] (usb_control_msg+0x0/0x108) from [<c039965c>] (hub_port_init+0x34c/0x960)
[    9.877497] [<c0399310>] (hub_port_init+0x0/0x960) from [<c039b944>] (hub_thread+0x3cc/0x12e0)
[    9.886158] [<c039b578>] (hub_thread+0x0/0x12e0) from [<c004c650>] (kthread+0xb4/0xc0)
[    9.894130] [<c004c59c>] (kthread+0x0/0xc0) from [<c000e5d0>] (ret_from_fork+0x18/0x24)
[    9.902158]  r7:00000000 r6:00000000 r5:c004c59c r4:cd82be84
[    9.907982] handlers:
[    9.910309] [<c03ae134>] dwc_otg_common_irq
[    9.914571] [<c03bc9ac>] dwc_otg_pcd_irq
[    9.918565] [<c039d168>] usb_hcd_irq
[    9.922201] Disabling IRQ #75