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

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Message-ID: <4D9C5494.1090607@parallels.com>
Date:	Wed, 6 Apr 2011 06:55:00 -0500
From:	Rob Landley <rlandley@...allels.com>
To:	Jens Axboe <jaxboe@...ionio.com>
CC:	Tejun Heo <tj@...nel.org>,
	Pete Clements <clem@...m.clem-digital.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>
Subject: Re: Commit 7eaceaccab5f40 causing boot hang.

On 03/31/2011 07:33 AM, Jens Axboe wrote:
> On 2011-03-31 14:11, Tejun Heo wrote:
>> Hello,
>>
>> On Thu, Mar 31, 2011 at 12:37:42PM +0200, Jens Axboe wrote:
>>> It seems to hard hang, looks very odd:
>> I think more likely failure mode is something is looping in block path
>> expecting someone else to do something but as it is busy looping and
>> preemption isn't enabled the someone else can't proceed.  We had a
>> similar problem in md lately.
>>
>>  http://thread.gmane.org/gmane.linux.raid/33020
> 
> I think this sound exactly right, and also explains why SMP works. And
> yes CONFIG_PREEMPT_VOLUNTARY=y is set.
> 
>> If this is the case, a good way to debug would be triggering sysrq-l
>> multiple times while the machine is hung and see where the CPU is busy
>> looping.
> 
> Doesn't respond to sysrq. I'll poke around.

Pulled and retested, still hanging for me right after announcing ext3.
Just FYI.

Rob
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