linux-kernel - Re: complete IO hang since a few kernel revision

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Date:	Sat, 10 Oct 2009 21:06:58 +0200
From:	Petr Titěra <P.Titera@...tury.cz>
To:	Mike Galbraith <efault@....de>
CC:	Norbert Preining <preining@...ic.at>,
	Ulrich Lukas <stellplatz-nr.13a@...enparkplatz.de>,
	linux-kernel@...r.kernel.org
Subject: Re: complete IO hang since a few kernel revision

Mike Galbraith napsal(a):
> On Tue, 2009-10-06 at 16:16 +0900, Norbert Preining wrote:
>   
>> On Tue, 06 Oct 2009, Mike Galbraith wrote:
>>     
>>> I've tried unsuccessfully to reproduce this behavior.
>>>
>>> Since it doesn't appear to be something readily reproducible, more
>>> information and/or some digging on your part may be needed.
>>>       
>> Hm, how could I do that? I am fine with compiling some strange 
>> kernel options, or running some debugging task, but I don't have
>> and netconsole or serial console available.
>>     
>
> Locating when it started for you would be valuable, even if it's not
> pin-pointed such as a git bisection could do.  A bisection is the best
> bet to nail it down, but can be quite time consuming.
>
>   
I see something similar here. Processes just get stuck in 
balance_dirty_pages for infinite time. It helps if, when process is 
stuck another process generates some dirty pages. Unfotunately last 
kernel I'm prety sure everything worked is 2.6.31-rc9-tip-01355-ge035e96 
(yes its x86 -tip kernel). I'm building new kernel now.

Petr

> One thing you can try is to drop to a non-gui shell, and see it the
> symptom is reproducible without the GUI.  If it is, poke SysRq-W while
> things are thoroughly jammed up, and post the output+config here.
>
> 	-Mike
>
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