Re: Commit 7eaceaccab5f40 causing boot hang.

From: Jens Axboe
Date: Fri Apr 08 2011 - 23:00:29 EST

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

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