Hi Philipp,

> This just happend on our IBM X31 running 2.6.1-vanilla when I disabled
> the internal bluetooth: (copied by hand from screen):
> 
> usb 4-1: USB disconnected, address 2
> Unable to handle kernel paging request at virtual address 80000234
>  printing eip:
> c026d9cf
> *pde = 00000000
> Oops: 0002 [#1]
> CPU:    0
> EIP:    0060:[<c026d9cf>]   Not tainted
> EFLAGS: 00010082
> EIP is at uhci_remove_pending_qhs+0x77/0x94
> eax: 80000234   ebx: 00000093   ecx: 80000200   edx: d2ccd4fc
> esi: efb3620c   edi: efb36218   ebp: c03c3ef4   esp: c03c3ed8
> ds: 007b   es: 007b   ss: 0068
> Process swapper (pid: 0, threadinfo=c03c2000 task=c03651e0)
> Stack: 00000003 00001840 efb36000 80000200 efb36218 00000286 efb3620c c03c3f14
>        c026da8c efb36000 efb36000 efb36000 efb36000 00000001 00000001 c03c3f2c
>        c0260209 efb36000 c03c3f78 efba0be0 04000001 c03c3f4c c010cad6 0000000b
> Call Trace:
>  [<c026da8c>] uhci_irq+0xa0/0xf0
>  [<c0260209>] usb_hcd_irq+0x2d/0x54
>  [<c010cad6>] handle_IRQ_event+0x2a/0x54
>  [<c010cd9e>] do_IRQ+0x82/0xf4
>  common_interrupt / acpi_proceddor_idel / default_idle / _stect /
>  cpu_idle / _stect / start_kernel
>   
> Code: 89 79 34 89 50 04 89 02 53 9d 3b 75 fc 75 a9 89 f6 ff 75 f8
>  <0>Kernel panic: Fatal exception in interrupt
> in interrupt handler - not syncing

this problem exists if you have compiled the HCI USB driver with the SCO
audio support. The workaround is to disable it. I haven't seen this bug
with an OHCI USB card, so I suspect a bug in the uhci_hcd driver, but I
am not sure.

Regards

Marcel




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