linux-kernel - Re: Commit 7eaceaccab5f40 causing boot hang.

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Message-ID: <4D9FCBC3.9040206@fusionio.com>
Date:	Sat, 9 Apr 2011 05:00:19 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Rob Landley <rlandley@...allels.com>
CC:	Pete Clements <clem@...m.clem-digital.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: Commit 7eaceaccab5f40 causing boot hang.

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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