Fatal trap 30: reserved (unknown) fault

[Alexander Motin]

Christoph Mallon wrote:
> Alexander Motin schrieb:
>> About month ago after one of my amd64 8-CURRENT upgrade I have started 
>> to see crashes with very strange message:
>> Fatal trap 30: reserved (unknown) fault while in kernel mode
>>
>> Crash usually happens during some driver loading or unloading, for 
>> example, snd_hda, which always worked fine before, or during ata 
>> channel detach/attach which also causes device destruction/creation. 
>> Backtrace of this state shows nothing interesting, for example idling 
>> in acpi_cpu_c1() or just DELAY().
>>
>> Does anybody knows, for whom is this fault "reserved" and what does it 
>> mean?
> 
> Intel:
>   20-31 -- Intel reserved. Do not use.
> 
> This exception really should not happen. Maybe int 0x30 is executed, but 
> this should not be the case either.

I have hit somewhere on web that traps may share vectors with interrupts 
and this may cause problems. Can't it be some mishandled IRQ? What will 
happen if some IRQ arrive after driver detach? How it will be handled?

-- 
Alexander Motin