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

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Message-ID: <4D9FCAF6.5030301@parallels.com>
Date:	Fri, 8 Apr 2011 21:56:54 -0500
From:	Rob Landley <rlandley@...allels.com>
To:	Jens Axboe <jaxboe@...ionio.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 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.

Rob
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