[Xen-devel] Pvops kernel: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected

["Mark Hurenkamp" <mark.hurenkamp@xxxxxxxxx>]

Hi,


I've been running an old machine with xen 3.2 reliably for quite a while,
but am now moving towards a new setup, and decided to give xen 4 a spin,
with the pvops kernel.
However, when i boot (recent linux-pvops, with recent xen-unstable), i
often see the following messages upon boot.
Anyway, i hope this info is of some use, and I'd appreciate any tips on
how to get this fixed!


Regards,
Mark.

======================================================
[ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ]
2.6.31.6mh10 #22
------------------------------------------------------
khubd/42 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
 (&retval->lock){......}, at: [<ffffffff810f5d4b>] dma_pool_alloc+0x36/0x2fb

and this task is already holding:
 (&ehci->lock){-.....}, at: [<ffffffff81342791>] ehci_urb_enqueue+0xa5/0xd50
which would create a new lock dependency:
 (&ehci->lock){-.....} -> (&retval->lock){......}

but this new dependency connects a HARDIRQ-irq-safe lock:
 (&ehci->lock){-.....}
... which became HARDIRQ-irq-safe at:
  [<ffffffff8107e042>] __lock_acquire+0x231/0xbc3
  [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
  [<ffffffff8144d311>] _spin_lock+0x36/0x69
  [<ffffffff8134144f>] ehci_irq+0x41/0x441
  [<ffffffff81329c09>] usb_hcd_irq+0x4a/0xa7
  [<ffffffff810a5964>] handle_IRQ_event+0x53/0x119
  [<ffffffff810a7628>] handle_level_irq+0x7d/0xce
  [<ffffffff8101574a>] handle_irq+0x8b/0x95
  [<ffffffff812893b3>] xen_evtchn_do_upcall+0xfa/0x194
  [<ffffffff81013fbe>] xen_do_hypervisor_callback+0x1e/0x30
  [<ffffffffffffffff>] 0xffffffffffffffff

to a HARDIRQ-irq-unsafe lock:
 (purge_lock){+.+...}
... which became HARDIRQ-irq-unsafe at:
...  [<ffffffff8107e0b6>] __lock_acquire+0x2a5/0xbc3
  [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
  [<ffffffff8144d311>] _spin_lock+0x36/0x69
  [<ffffffff810efe9a>] __purge_vmap_area_lazy+0x54/0x175
  [<ffffffff810f12af>] vm_unmap_aliases+0x180/0x18f
  [<ffffffff8100e308>] xen_alloc_ptpage+0x47/0x75
  [<ffffffff8100e373>] xen_alloc_pte+0x13/0x15
  [<ffffffff8103587a>] T.829+0x2f/0x5a
  [<ffffffff810358d6>] fill_pte+0x31/0xa5
ata1.00: SATA link down (SStatus 0 SControl 300)
ata1.01: SATA link down (SStatus 0 SControl 300)
  [<ffffffff81035a8e>] set_pte_vaddr_pud+0x31/0x4d
  [<ffffffff8100c651>] xen_set_fixmap+0xfd/0x104
  [<ffffffff81949e75>] pvclock_init_vsyscall+0x7e/0x8e
  [<ffffffff8193ae63>] xen_time_init+0xe6/0x113
  [<ffffffff81937059>] start_kernel+0x38d/0x427
  [<ffffffff81936621>] x86_64_start_reservations+0xac/0xb0
  [<ffffffff8193a28a>] xen_start_kernel+0x5dc/0x5e3
  [<ffffffffffffffff>] 0xffffffffffffffff

other info that might help us debug this:

2 locks held by khubd/42:
 #0:  (usb_address0_mutex){+.+...}, at: [<ffffffff81325163>]
hub_port_init+0x7c/0x7c3
 #1:  (&ehci->lock){-.....}, at: [<ffffffff81342791>]
ehci_urb_enqueue+0xa5/0xd50

the HARDIRQ-irq-safe lock's dependencies:
-> (&ehci->lock){-.....} ops: 0 {
   IN-HARDIRQ-W at:
                        [<ffffffff8107e042>] __lock_acquire+0x231/0xbc3
                        [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
                        [<ffffffff8144d311>] _spin_lock+0x36/0x69
                        [<ffffffff8134144f>] ehci_irq+0x41/0x441
                        [<ffffffff81329c09>] usb_hcd_irq+0x4a/0xa7
                        [<ffffffff810a5964>] handle_IRQ_event+0x53/0x119
                        [<ffffffff810a7628>] handle_level_irq+0x7d/0xce
                        [<ffffffff8101574a>] handle_irq+0x8b/0x95
                        [<ffffffff812893b3>] xen_evtchn_do_upcall+0xfa/0x194
                        [<ffffffff81013fbe>]
xen_do_hypervisor_callback+0x1e/0x30
                        [<ffffffffffffffff>] 0xffffffffffffffff
   INITIAL USE at:
ata2.00: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata2.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
                       [<ffffffff8107e12d>] __lock_acquire+0x31c/0xbc3
                       [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
ata2.00: ATA-7: SAMSUNG HD154UI, 1AG01118, max UDMA7
ata2.00: 2930277168 sectors, multi 16: LBA48 NCQ (depth 0/32)
                       [<ffffffff8144d311>] _spin_lock+0x36/0x69
                       [<ffffffff8134144f>] ehci_irq+0x41/0x441
                       [<ffffffff81329c09>] usb_hcd_irq+0x4a/0xa7
ata2.01: ATA-8: ST31500341AS, CC1J, max UDMA/133
ata2.01: 2930277168 sectors, multi 16: LBA48 NCQ (depth 0/32)
                       [<ffffffff810a5964>] handle_IRQ_event+0x53/0x119
                       [<ffffffff810a7628>] handle_level_irq+0x7d/0xce
                       [<ffffffff8101574a>] handle_irq+0x8b/0x95
                       [<ffffffff812893b3>] xen_evtchn_do_upcall+0xfa/0x194
                       [<ffffffff81013fbe>]
xen_do_hypervisor_callback+0x1e/0x30
                       [<ffffffffffffffff>] 0xffffffffffffffff
 }
 ... key      at: [<ffffffff8255da38>] __key.35628+0x0/0x8
 -> (hcd_urb_list_lock){......} ops: 0 {
    INITIAL USE at:
                         [<ffffffff8107e12d>] __lock_acquire+0x31c/0xbc3
                         [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
                         [<ffffffff8144d311>] _spin_lock+0x36/0x69
                         [<ffffffff81329ee5>]
usb_hcd_link_urb_to_ep+0x28/0xa3
                         [<ffffffff8132b3fa>] usb_hcd_submit_urb+0x30f/0xa09
                         [<ffffffff8132c092>] usb_submit_urb+0x24b/0x2c8
                         [<ffffffff8132d54c>] usb_start_wait_urb+0x62/0x1a8
                         [<ffffffff8132d8c9>] usb_control_msg+0xf2/0x116
                         [<ffffffff8132e9cc>] usb_get_descriptor+0x76/0xa8
                         [<ffffffff8132ea74>]
usb_get_device_descriptor+0x76/0xa6
                         [<ffffffff8132ac05>] usb_add_hcd+0x463/0x67c
                         [<ffffffff81338460>] usb_hcd_pci_probe+0x254/0x398
                         [<ffffffff812263dd>] local_pci_probe+0x17/0x1b
                         [<ffffffff81068986>] do_work_for_cpu+0x18/0x2a
                         [<ffffffff8106c8eb>] kthread+0x91/0x99
                         [<ffffffff81013e6a>] child_rip+0xa/0x20
                         [<ffffffffffffffff>] 0xffffffffffffffff
  }
  ... key      at: [<ffffffff8171d6d8>] hcd_urb_list_lock+0x18/0x40
 ... acquired at:
   [<ffffffff8107e858>] __lock_acquire+0xa47/0xbc3
   [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
   [<ffffffff8144d311>] _spin_lock+0x36/0x69
   [<ffffffff81329ee5>] usb_hcd_link_urb_to_ep+0x28/0xa3
   [<ffffffff813427aa>] ehci_urb_enqueue+0xbe/0xd50
   [<ffffffff8132b95f>] usb_hcd_submit_urb+0x874/0xa09
   [<ffffffff8132c092>] usb_submit_urb+0x24b/0x2c8
   [<ffffffff8132d54c>] usb_start_wait_urb+0x62/0x1a8
   [<ffffffff8132d8c9>] usb_control_msg+0xf2/0x116
   [<ffffffff813253f4>] hub_port_init+0x30d/0x7c3
   [<ffffffff81328814>] hub_events+0x91a/0x1199
   [<ffffffff813290ca>] hub_thread+0x37/0x1ad
   [<ffffffff8106c8eb>] kthread+0x91/0x99
   [<ffffffff81013e6a>] child_rip+0xa/0x20
   [<ffffffffffffffff>] 0xffffffffffffffff


the HARDIRQ-irq-unsafe lock's dependencies:
-> (purge_lock){+.+...} ops: 0 {
   HARDIRQ-ON-W at:
                        [<ffffffff8107e0b6>] __lock_acquire+0x2a5/0xbc3
                        [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
                        [<ffffffff8144d311>] _spin_lock+0x36/0x69
                        [<ffffffff810efe9a>]
__purge_vmap_area_lazy+0x54/0x175
                        [<ffffffff810f12af>] vm_unmap_aliases+0x180/0x18f
                        [<ffffffff8100e308>] xen_alloc_ptpage+0x47/0x75
                        [<ffffffff8100e373>] xen_alloc_pte+0x13/0x15
                        [<ffffffff8103587a>] T.829+0x2f/0x5a
                        [<ffffffff810358d6>] fill_pte+0x31/0xa5
                        [<ffffffff81035a8e>] set_pte_vaddr_pud+0x31/0x4d
                        [<ffffffff8100c651>] xen_set_fixmap+0xfd/0x104
                        [<ffffffff81949e75>] pvclock_init_vsyscall+0x7e/0x8e
                        [<ffffffff8193ae63>] xen_time_init+0xe6/0x113
                        [<ffffffff81937059>] start_kernel+0x38d/0x427
                        [<ffffffff81936621>]
x86_64_start_reservations+0xac/0xb0
                        [<ffffffff8193a28a>] xen_start_kernel+0x5dc/0x5e3
                        [<ffffffffffffffff>] 0xffffffffffffffff
   SOFTIRQ-ON-W at:
                        [<ffffffff8107e0d7>] __lock_acquire+0x2c6/0xbc3
                        [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
                        [<ffffffff8144d311>] _spin_lock+0x36/0x69
                        [<ffffffff810efe9a>]
__purge_vmap_area_lazy+0x54/0x175
                        [<ffffffff810f12af>] vm_unmap_aliases+0x180/0x18f
                        [<ffffffff8100e308>] xen_alloc_ptpage+0x47/0x75
                        [<ffffffff8100e373>] xen_alloc_pte+0x13/0x15
                        [<ffffffff8103587a>] T.829+0x2f/0x5a
                        [<ffffffff810358d6>] fill_pte+0x31/0xa5
                        [<ffffffff81035a8e>] set_pte_vaddr_pud+0x31/0x4d
                        [<ffffffff8100c651>] xen_set_fixmap+0xfd/0x104
                        [<ffffffff81949e75>] pvclock_init_vsyscall+0x7e/0x8e
                        [<ffffffff8193ae63>] xen_time_init+0xe6/0x113
                        [<ffffffff81937059>] start_kernel+0x38d/0x427
                        [<ffffffff81936621>]
x86_64_start_reservations+0xac/0xb0
                        [<ffffffff8193a28a>] xen_start_kernel+0x5dc/0x5e3
                        [<ffffffffffffffff>] 0xffffffffffffffff
   INITIAL USE at:
                       [<ffffffff8107e12d>] __lock_acquire+0x31c/0xbc3
                       [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
                       [<ffffffff8144d311>] _spin_lock+0x36/0x69
                       [<ffffffff810efe9a>] __purge_vmap_area_lazy+0x54/0x175
                       [<ffffffff810f12af>] vm_unmap_aliases+0x180/0x18f
                       [<ffffffff8100e308>] xen_alloc_ptpage+0x47/0x75
                       [<ffffffff8100e373>] xen_alloc_pte+0x13/0x15
                       [<ffffffff8103587a>] T.829+0x2f/0x5a
                       [<ffffffff810358d6>] fill_pte+0x31/0xa5
                       [<ffffffff81035a8e>] set_pte_vaddr_pud+0x31/0x4d
                       [<ffffffff8100c651>] xen_set_fixmap+0xfd/0x104
                       [<ffffffff81949e75>] pvclock_init_vsyscall+0x7e/0x8e
                       [<ffffffff8193ae63>] xen_time_init+0xe6/0x113
                       [<ffffffff81937059>] start_kernel+0x38d/0x427
                       [<ffffffff81936621>]
x86_64_start_reservations+0xac/0xb0
                       [<ffffffff8193a28a>] xen_start_kernel+0x5dc/0x5e3
                       [<ffffffffffffffff>] 0xffffffffffffffff
 }
 ... key      at: [<ffffffff816e4888>] purge_lock.26563+0x18/0x40
 -> (vmap_area_lock){+.+...} ops: 0 {
    HARDIRQ-ON-W at:
                          [<ffffffff8107e0b6>] __lock_acquire+0x2a5/0xbc3
                          [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
                          [<ffffffff8144d311>] _spin_lock+0x36/0x69
                          [<ffffffff810f0180>] alloc_vmap_area+0x101/0x251
                          [<ffffffff810f0405>] __get_vm_area_node+0x135/0x1e1
                          [<ffffffff810f0d43>] __vmalloc_node+0x68/0x90
                          [<ffffffff810f0ec2>] __vmalloc+0x15/0x17
                          [<ffffffff81956863>]
alloc_large_system_hash+0x112/0x1ca
                          [<ffffffff81958782>] vfs_caches_init+0xa9/0x11b
                          [<ffffffff819370ac>] start_kernel+0x3e0/0x427
                          [<ffffffff81936621>]
x86_64_start_reservations+0xac/0xb0
                          [<ffffffff8193a28a>] xen_start_kernel+0x5dc/0x5e3
                          [<ffffffffffffffff>] 0xffffffffffffffff
    SOFTIRQ-ON-W at:
                          [<ffffffff8107e0d7>] __lock_acquire+0x2c6/0xbc3
                          [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
                          [<ffffffff8144d311>] _spin_lock+0x36/0x69
                          [<ffffffff810f0180>] alloc_vmap_area+0x101/0x251
                          [<ffffffff810f0405>] __get_vm_area_node+0x135/0x1e1
                          [<ffffffff810f0d43>] __vmalloc_node+0x68/0x90
                          [<ffffffff810f0ec2>] __vmalloc+0x15/0x17
                          [<ffffffff81956863>]
alloc_large_system_hash+0x112/0x1ca
                          [<ffffffff81958782>] vfs_caches_init+0xa9/0x11b
                          [<ffffffff819370ac>] start_kernel+0x3e0/0x427
                          [<ffffffff81936621>]
x86_64_start_reservations+0xac/0xb0
                          [<ffffffff8193a28a>] xen_start_kernel+0x5dc/0x5e3
                          [<ffffffffffffffff>] 0xffffffffffffffff
    INITIAL USE at:
                         [<ffffffff8107e12d>] __lock_acquire+0x31c/0xbc3
                         [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
                         [<ffffffff8144d311>] _spin_lock+0x36/0x69
ata2.00: configured for UDMA/133
                         [<ffffffff810f0180>] alloc_vmap_area+0x101/0x251
                         [<ffffffff810f0405>] __get_vm_area_node+0x135/0x1e1
                         [<ffffffff810f0d43>] __vmalloc_node+0x68/0x90
                         [<ffffffff810f0ec2>] __vmalloc+0x15/0x17
                         [<ffffffff81956863>]
alloc_large_system_hash+0x112/0x1ca
                         [<ffffffff81958782>] vfs_caches_init+0xa9/0x11b
                         [<ffffffff819370ac>] start_kernel+0x3e0/0x427
                         [<ffffffff81936621>]
x86_64_start_reservations+0xac/0xb0
                         [<ffffffff8193a28a>] xen_start_kernel+0x5dc/0x5e3
                         [<ffffffffffffffff>] 0xffffffffffffffff
  }
  ... key      at: [<ffffffff816e4838>] vmap_area_lock+0x18/0x40
  -> (&rnp->lock){..-...} ops: 0 {
     IN-SOFTIRQ-W at:
                            [<ffffffff8107e063>] __lock_acquire+0x252/0xbc3
                            [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
                            [<ffffffff8144d477>] _spin_lock_irqsave+0x4e/0x88
                            [<ffffffff810a8c88>] cpu_quiet+0x25/0x86
                            [<ffffffff810a92f7>]
__rcu_process_callbacks+0x74/0x236
                            [<ffffffff810a9503>]
rcu_process_callbacks+0x4a/0x4f
                            [<ffffffff8105be72>] __do_softirq+0xe7/0x1cb
                            [<ffffffff81013f6c>] call_softirq+0x1c/0x30
                            [<ffffffff810154e0>] do_softirq+0x50/0xb1
                            [<ffffffff8105b903>] irq_exit+0x53/0x95
                            [<ffffffff81289431>]
xen_evtchn_do_upcall+0x178/0x194
                            [<ffffffff81013fbe>]
xen_do_hypervisor_callback+0x1e/0x30
                            [<ffffffffffffffff>] 0xffffffffffffffff
     INITIAL USE at:
                           [<ffffffff8107e12d>] __lock_acquire+0x31c/0xbc3
                           [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
                           [<ffffffff8144d477>] _spin_lock_irqsave+0x4e/0x88
                           [<ffffffff81448f81>]
rcu_init_percpu_data+0x2e/0x166
                           [<ffffffff814490f7>] rcu_cpu_notify+0x3e/0x84
                           [<ffffffff81953b25>] __rcu_init+0x147/0x178
                           [<ffffffff8195141e>] rcu_init+0x9/0x17
                           [<ffffffff81936f25>] start_kernel+0x259/0x427
                           [<ffffffff81936621>]
x86_64_start_reservations+0xac/0xb0
                           [<ffffffff8193a28a>] xen_start_kernel+0x5dc/0x5e3
                           [<ffffffffffffffff>] 0xffffffffffffffff
   }
   ... key      at: [<ffffffff8237f600>] __key.20504+0x0/0x8
  ... acquired at:
   [<ffffffff8107e858>] __lock_acquire+0xa47/0xbc3
   [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
   [<ffffffff8144d477>] _spin_lock_irqsave+0x4e/0x88
   [<ffffffff810a9131>] __call_rcu+0x8a/0x111
   [<ffffffff810a91e4>] call_rcu+0x15/0x17
   [<ffffffff810efe41>] __free_vmap_area+0x68/0x6d
   [<ffffffff810eff80>] __purge_vmap_area_lazy+0x13a/0x175
   [<ffffffff810f12af>] vm_unmap_aliases+0x180/0x18f
   [<ffffffff8100e308>] xen_alloc_ptpage+0x47/0x75
   [<ffffffff8100e373>] xen_alloc_pte+0x13/0x15
   [<ffffffff810e665f>] __pte_alloc_kernel+0x5a/0xb4
   [<ffffffff8120e0dd>] ioremap_page_range+0x19d/0x298
   [<ffffffff81036e08>] __ioremap_caller+0x2cf/0x358
   [<ffffffff81036f73>] ioremap_nocache+0x17/0x19
   [<ffffffff8196ce27>] pci_mmcfg_arch_init+0xab/0x143
   [<ffffffff8196db3a>] __pci_mmcfg_init+0x2c9/0x2fa
   [<ffffffff8196db76>] pci_mmcfg_late_init+0xb/0xd
   [<ffffffff8196311e>] acpi_init+0x1aa/0x265
   [<ffffffff8100a07d>] do_one_initcall+0x72/0x193
   [<ffffffff81936a42>] kernel_init+0x18b/0x1e5
   [<ffffffff81013e6a>] child_rip+0xa/0x20
   [<ffffffffffffffff>] 0xffffffffffffffff

 ... acquired at:
   [<ffffffff8107e858>] __lock_acquire+0xa47/0xbc3
   [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
   [<ffffffff8144d311>] _spin_lock+0x36/0x69
   [<ffffffff810eff69>] __purge_vmap_area_lazy+0x123/0x175
   [<ffffffff810f12af>] vm_unmap_aliases+0x180/0x18f
   [<ffffffff8100e308>] xen_alloc_ptpage+0x47/0x75
   [<ffffffff8100e373>] xen_alloc_pte+0x13/0x15
   [<ffffffff810e665f>] __pte_alloc_kernel+0x5a/0xb4
   [<ffffffff8120e0dd>] ioremap_page_range+0x19d/0x298
   [<ffffffff81036e08>] __ioremap_caller+0x2cf/0x358
   [<ffffffff81036f73>] ioremap_nocache+0x17/0x19
   [<ffffffff8196ce27>] pci_mmcfg_arch_init+0xab/0x143
   [<ffffffff8196db3a>] __pci_mmcfg_init+0x2c9/0x2fa
   [<ffffffff8196db76>] pci_mmcfg_late_init+0xb/0xd
   [<ffffffff8196311e>] acpi_init+0x1aa/0x265
   [<ffffffff8100a07d>] do_one_initcall+0x72/0x193
   [<ffffffff81936a42>] kernel_init+0x18b/0x1e5
   [<ffffffff81013e6a>] child_rip+0xa/0x20
   [<ffffffffffffffff>] 0xffffffffffffffff


stack backtrace:
Pid: 42, comm: khubd Not tainted 2.6.31.6mh10 #22
Call Trace:
 [<ffffffff8107dd42>] check_usage+0x28b/0x29c
 [<ffffffff8107da0b>] ? check_noncircular+0x92/0xc2
 [<ffffffff8107ddb0>] check_irq_usage+0x5d/0xbe
 [<ffffffff8107e752>] __lock_acquire+0x941/0xbc3
 [<ffffffff8107eaab>] lock_acquire+0xd7/0x103
 [<ffffffff810f5d4b>] ? dma_pool_alloc+0x36/0x2fb
 [<ffffffff8144d477>] _spin_lock_irqsave+0x4e/0x88
 [<ffffffff810f5d4b>] ? dma_pool_alloc+0x36/0x2fb
 [<ffffffff8101d0cb>] ? save_stack_trace+0x2f/0x4c
 [<ffffffff810f5d4b>] dma_pool_alloc+0x36/0x2fb
 [<ffffffff8107c671>] ? add_lock_to_list+0x7b/0xc1
 [<ffffffff8100ecf7>] ? xen_clocksource_read+0x21/0x23
 [<ffffffff8100eddc>] ? xen_sched_clock+0x14/0x8c
 [<ffffffff8134085e>] ehci_qh_alloc+0x28/0xd9
 [<ffffffff813422d7>] qh_append_tds+0x3d/0x452
 [<ffffffff8144d178>] ? _spin_unlock+0x2b/0x30
 [<ffffffff813427cf>] ehci_urb_enqueue+0xe3/0xd50
 [<ffffffff8121ff5e>] ? debug_dma_map_page+0xe4/0xf3
 [<ffffffff8132b0d8>] ? T.619+0xbc/0xcf
 [<ffffffff8132b95f>] usb_hcd_submit_urb+0x874/0xa09
 [<ffffffff8107cf1a>] ? mark_lock+0x2d/0x226
 [<ffffffff8100e7c1>] ? xen_force_evtchn_callback+0xd/0xf
 [<ffffffff8100eee2>] ? check_events+0x12/0x20
 [<ffffffff8132c092>] usb_submit_urb+0x24b/0x2c8
 [<ffffffff8106cf7c>] ? __init_waitqueue_head+0x3a/0x4e
 [<ffffffff8132d54c>] usb_start_wait_urb+0x62/0x1a8
 [<ffffffff8132c4e2>] ? usb_alloc_urb+0x1e/0x48
 [<ffffffff8100eecf>] ? xen_restore_fl_direct_end+0x0/0x1
 [<ffffffff8132c4b4>] ? usb_init_urb+0x27/0x37
 [<ffffffff8132d8c9>] usb_control_msg+0xf2/0x116
 [<ffffffff8132536e>] ? hub_port_init+0x287/0x7c3
 [<ffffffff813253f4>] hub_port_init+0x30d/0x7c3
 [<ffffffff81328814>] hub_events+0x91a/0x1199
 [<ffffffff8100e7c1>] ? xen_force_evtchn_callback+0xd/0xf
 [<ffffffff8100eee2>] ? check_events+0x12/0x20
 [<ffffffff813290ca>] hub_thread+0x37/0x1ad
 [<ffffffff8106cc4a>] ? autoremove_wake_function+0x0/0x39
 [<ffffffff81329093>] ? hub_thread+0x0/0x1ad
 [<ffffffff8106c8eb>] kthread+0x91/0x99
 [<ffffffff81013e6a>] child_rip+0xa/0x20
 [<ffffffff810137d0>] ? restore_args+0x0/0x30
 [<ffffffff81013e60>] ? child_rip+0x0/0x20



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