From: Rob Landley <rlandley@parallels.com>
To: Jens Axboe <jaxboe@fusionio.com>
Cc: Tejun Heo <tj@kernel.org>,
Pete Clements <clem@clem.clem-digital.net>,
linux-kernel <linux-kernel@vger.kernel.org>,
"linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>
Subject: Re: Commit 7eaceaccab5f40 causing boot hang.
Date: Wed, 6 Apr 2011 06:55:00 -0500 [thread overview]
Message-ID: <4D9C5494.1090607@parallels.com> (raw)
In-Reply-To: <4D9474AA.4070402@fusionio.com>
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
prev parent reply other threads:[~2011-04-06 11:55 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-29 6:19 Commit 7eaceaccab5f40 causing boot hang Rob Landley
2011-03-29 6:19 ` Rob Landley
2011-03-29 6:35 ` Jens Axboe
2011-03-29 8:52 ` Rob Landley
2011-03-29 13:59 ` Jens Axboe
2011-03-29 14:13 ` Rob Landley
2011-03-29 14:16 ` Jens Axboe
2011-03-29 15:51 ` Pete Clements
2011-03-29 15:51 ` Pete Clements
2011-03-30 6:06 ` Rob Landley
2011-03-30 11:38 ` Jens Axboe
2011-03-30 13:52 ` Rob Landley
2011-03-31 9:02 ` Jens Axboe
2011-03-31 9:11 ` Rob Landley
2011-03-31 10:07 ` Jens Axboe
2011-03-31 10:37 ` Jens Axboe
2011-03-31 10:47 ` Rob Landley
2011-03-31 11:09 ` Jens Axboe
2011-04-01 3:11 ` Nicholas A. Bellinger
2011-04-03 7:05 ` Andreas Mohr
2011-04-01 12:26 ` Mark Lord
2011-04-09 2:56 ` Rob Landley
2011-04-09 3:00 ` Jens Axboe
2011-03-31 12:11 ` Tejun Heo
2011-03-31 12:33 ` Jens Axboe
2011-03-31 13:09 ` Richard Kennedy
2011-03-31 13:18 ` Jens Axboe
2011-03-31 13:23 ` Richard Kennedy
2011-03-31 13:33 ` Jens Axboe
2011-03-31 14:49 ` Richard Kennedy
2011-04-04 13:47 ` Richard Kennedy
2011-04-13 10:25 ` Richard Kennedy
2011-04-13 10:36 ` Jens Axboe
2011-04-06 11:55 ` Rob Landley [this message]
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