Re: Commit 7eaceaccab5f40 causing boot hang.

[Jens Axboe <jaxboe@fusionio.com>]

On 2011-04-09 04:56, Rob Landley wrote:
> On 03/31/2011 06:09 AM, Jens Axboe wrote:
>> On 2011-03-31 12:47, Rob Landley wrote:
>>> On 03/31/2011 05:37 AM, Jens Axboe wrote:
>>>>>>> Can you send me your .config?
>>>>>>
>>>>>> It was attached to the first message in this series, here it is again.
>>>>>>
>>>>>> I update it via "make oldconfig" and hold down return.
>>>>>>
>>>>>> I boot it via:
>>>>>>
>>>>>> qemu-system-x86_64 -m 1024 -kernel arch/x86/boot/bzImage \
>>>>>>   -hda ~/sid.ext3 -append "root=/dev/hda rw"
>>>>>
>>>>> Much better, I see the hang now! Now to try and diagnose...
>>>>
>>>> It seems to hard hang, looks very odd:
>>>
>>> I should have mentioned that: when it hangs, you can't page back up in
>>> the console display anymore.
>>
>> Data point - only seems to happen on UP. If you add -smp X to kvm, then
>> it boots and works just fine. It smells oddly like some sort of irq
>> event.
>>
> 
> The workaround for this is to disable preemption, by the way.

Indeed, I think those bits were mentioned earlier. I will get to this
early next week, been away traveling and not back yet.

-- 
Jens Axboe