[vbox-dev] Question regarding USB support under VirtualBOX

[Alexander eichner]

Hi,

Assertions are printing the file and line number into the VBox.log  
when they are triggered. So getting the log of the aborted VM would  
help.

Regards,
Alexander Eichner

On 26.01.2011 at 18:00 Hans Petter Selasky, wrote <hselasky at c2i.net>:

> On Wednesday 26 January 2011 17:46:41 Klaus Espenlaub wrote:
>> On 23.01.2011 17:36, Hans Petter Selasky wrote:
>>> Hi,
>>>
>>> During usage of VirtualBOX under FreeBSD 8.2, I've noticed that  
>>> the VM
>>> sometimes crashes if the USB string descriptors or other descriptors
>>> cannot be read or the device itself cannot be created, because the
>>> device is not responding.
>>>
>>> From what I can understand VirtualBox USB enumeration has two  
>>> stages:
>>> 1) Identifying devices
>>> 2) Probing devices
>>>
>>> There is no guarantee that identified devices won't disappear  
>>> until they
>>> are probed. Should the FreeBSD USB layer in this case return fake  
>>> status
>>> values, to avoid VirtualBOX from asserting.
>>
>> This is extremely vague, as it we have many thousand assertions  
>> spread
>> all over the VirtualBox code.
>>
>> Generally it would be helpful to have a VBox.log with the assertion.
>>
>>> 3) Reading any USB descriptor could theoretically fail at any  
>>> time. The
>>> USB 1/2 specification specifies the STALL message, and there can  
>>> be bus
>>> errors aswell. Who is responsible for hiding these failures, so  
>>> that the
>>> VirtualBOX machine does not assert()?
>>
>> Again - what assertion?
>>
>> Klaus
>
> Hi,
>
> I will try to get VirtualBOX compiled with debug symbols and get you  
> the exact
> assertion that it triggers on.
>
> --HPS
>
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