Just got the below when I plugged in a new webcam. Not sure it's a bug
in xhci (using GFP_KERNEL presumably) or (less likely?) in the USB
autosuspend code.
johannes
[ 141.317464] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[ 141.558966] usb 1-1: New USB device found, idVendor=058f, idProduct=5608
[ 141.559035] usb 1-1: New USB device strings: Mfr=3, Product=1, SerialNumber=0
[ 141.559094] usb 1-1: Product: USB 2.0 PC Camera
[ 141.559160] usb 1-1: Manufacturer: Alcor Micro, Corp.
[ 141.566501] uvcvideo: Found UVC 1.00 device USB 2.0 PC Camera (058f:5608)
[ 141.571136] input: USB 2.0 PC Camera as /devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.0/input/input11
[ 143.809835] BUG: sleeping function called from invalid context at mm/slab.c:2946
[ 143.809922] in_atomic(): 1, irqs_disabled(): 1, pid: 39, name: kworker/2:1
[ 143.809994] 4 locks held by kworker/2:1/39:
[ 143.810041] #0: ("pm"){.+.+.+}, at: [<ffffffff81055490>] process_one_work+0x171/0x40a
[ 143.810268] #1: ((&dev->power.work)){+.+.+.}, at: [<ffffffff81055490>] process_one_work+0x171/0x40a
[ 143.810483] #2: (&port_dev->status_lock){+.+.+.}, at: [<ffffffffa000781b>] usb_lock_port+0x12/0x14 [usbcore]
[ 143.810709] #3: (&(&xhci->lock)->rlock){-.-...}, at: [<ffffffffa00ce119>] xhci_stop_device.constprop.10+0x4e/0x13f [xhci_hcd]
[ 143.810955] irq event stamp: 91782
[ 143.811007] hardirqs last enabled at (91781): [<ffffffff8107b271>] debug_check_no_locks_freed+0x12b/0x141
[ 143.811119] hardirqs last disabled at (91782): [<ffffffff813ea8db>] _raw_spin_lock_irqsave+0x1a/0x55
[ 143.811228] softirqs last enabled at (91684): [<ffffffff8132139d>] neigh_periodic_work+0x102/0x27e
[ 143.811337] softirqs last disabled at (91680): [<ffffffff813212ca>] neigh_periodic_work+0x2f/0x27e
[ 143.811450] CPU: 2 PID: 39 Comm: kworker/2:1 Not tainted 3.15.0-rc8+ #37
[ 143.811529] Hardware name: Dell Inc. Latitude E6430/0CPWYR, BIOS A09 12/13/2012
[ 143.811605] Workqueue: pm pm_runtime_work
[ 143.811699] 0000000000000027 ffff8802153fb718 ffffffff813e53fc 0000000000000006
[ 143.811896] ffff8802153f4a50 ffff8802153fb748 ffffffff81063def 0000000000000001
[ 143.812092] ffff880213758000 ffff88021d800280 0000000000008010 ffff8802153fb758
[ 143.812288] Call Trace:
[ 143.812338] [<ffffffff813e53fc>] dump_stack+0x4e/0x68
[ 143.812397] [<ffffffff81063def>] __might_sleep+0x19c/0x1a4
[ 143.812470] [<ffffffff81121f13>] cache_alloc_debugcheck_before.isra.34+0x1d/0x24
[ 143.812554] [<ffffffff81123fa1>] __kmalloc+0x4c/0x11c
[ 143.812617] [<ffffffffa00c727f>] ? kzalloc+0xf/0x11 [xhci_hcd]
[ 143.812683] [<ffffffffa00c727f>] kzalloc+0xf/0x11 [xhci_hcd]
[ 143.812747] [<ffffffffa00c827e>] xhci_alloc_command+0x27/0xaf [xhci_hcd]
[ 143.812813] [<ffffffffa00ce141>] xhci_stop_device.constprop.10+0x76/0x13f [xhci_hcd]
[ 143.812893] [<ffffffffa00ceb99>] xhci_hub_control+0x89d/0xd6a [xhci_hcd]
[ 143.812966] [<ffffffffa000f759>] usb_hcd_submit_urb+0x5c7/0x777 [usbcore]
[ 143.813034] [<ffffffff8109fa91>] ? rcu_read_lock_held+0x36/0x38
[ 143.813094] [<ffffffff8109ff95>] ? __module_address+0x9a/0xc6
[ 143.813160] [<ffffffffa001086d>] usb_submit_urb+0x43a/0x467 [usbcore]
[ 143.813222] [<ffffffff810783e1>] ? lockdep_init_map+0x142/0x154
[ 143.813288] [<ffffffffa00112d0>] usb_start_wait_urb+0x59/0xcf [usbcore]
[ 143.813362] [<ffffffffa001156e>] usb_control_msg+0xc9/0xfb [usbcore]
[ 143.813453] [<ffffffffa00078d2>] set_port_feature+0x43/0x45 [usbcore]
[ 143.813524] [<ffffffffa000b5a6>] usb_port_suspend+0x1b7/0x2a0 [usbcore]
[ 143.813594] [<ffffffff8107b144>] ? trace_hardirqs_on+0xd/0xf
[ 143.813662] [<ffffffffa001adce>] generic_suspend+0x21/0x27 [usbcore]
[ 143.813730] [<ffffffffa001349c>] usb_suspend_both+0xf5/0x193 [usbcore]
[ 143.813799] [<ffffffffa0014492>] usb_runtime_suspend+0x2a/0x58 [usbcore]
[ 143.813867] [<ffffffffa0014468>] ? usb_probe_device+0x3b/0x3b [usbcore]
[ 143.813931] [<ffffffff812c762c>] __rpm_callback+0x2f/0x56
[ 143.813998] [<ffffffff812c76a4>] rpm_callback+0x51/0x74
[ 143.814062] [<ffffffff812c7e85>] rpm_suspend+0x294/0x40a
[ 143.814120] [<ffffffff813ea8ba>] ? _raw_spin_lock_irq+0x42/0x49
[ 143.814180] [<ffffffff812c75e5>] ? spin_lock_irq+0x9/0xb
[ 143.814237] [<ffffffff812c8d30>] pm_runtime_work+0x8c/0xac
[ 143.814295] [<ffffffff8105555d>] process_one_work+0x23e/0x40a
[ 143.814353] [<ffffffff81055490>] ? process_one_work+0x171/0x40a
[ 143.814428] [<ffffffff81055882>] worker_thread+0x12f/0x1fd
[ 143.814488] [<ffffffff81055753>] ? process_scheduled_works+0x2a/0x2a
[ 143.814557] [<ffffffff81055753>] ? process_scheduled_works+0x2a/0x2a
[ 143.814618] [<ffffffff8105b391>] kthread+0xb5/0xbd
[ 143.814673] [<ffffffff8105b2dc>] ? __kthread_parkme+0x5c/0x5c
[ 143.814733] [<ffffffff813f0d3c>] ret_from_fork+0x7c/0xb0
[ 143.814789] [<ffffffff8105b2dc>] ? __kthread_parkme+0x5c/0x5c
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