linux-kernel - Re: [PATCH 21/21] TTY: move tty buffers to tty

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Date:	Sat, 03 Nov 2012 20:53:02 -0400
From:	Sasha Levin <levinsasha928@...il.com>
To:	Jiri Slaby <jslaby@...e.cz>
CC:	Jiri Slaby <jirislaby@...il.com>, gregkh@...uxfoundation.org,
	alan@...ux.intel.com, linux-kernel@...r.kernel.org,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH 21/21] TTY: move tty buffers to tty_port

On 11/03/2012 07:06 PM, Sasha Levin wrote:
> On 11/03/2012 11:55 AM, Jiri Slaby wrote:
>> On 11/03/2012 03:03 AM, Sasha Levin wrote:
>>> On 11/02/2012 12:18 PM, Jiri Slaby wrote:
>>>> On 11/02/2012 05:07 PM, Sasha Levin wrote:
>>>>> On Fri, Nov 2, 2012 at 11:51 AM, Jiri Slaby <jslaby@...e.cz> wrote:
>>>>>> On 10/31/2012 04:59 PM, Sasha Levin wrote:
>>>>>>> So you probably want a lot more than 100k syscalls, why limit it at
>>>>>>> all actually?
>>>>>>
>>>>>> I unset the limit but I still can't reproduce...
>>>>>>
>>>>>>> I've attached my .config for the guest kernel as reference.
>>>>>>
>>>>>> Even using this config does not help to reproduce that.
>>>>>>
>>>>>> Do you use some special trinity params?
>>>>>
>>>>> Not really:
>>>>>
>>>>>     ./trinity -m --quiet --dangerous -l off
>>>>
>>>> Oh, you run that as root??
>>>>
>>>>> Can I add something to my kernel to provide more info when it happens?
>>>>
>>>> Maybe the attached patch can tell us more...
>>>>
>>>
>>> Nope, I see the warnings mentioned before, without the new 'HUH' warnings.
>>
>> Actually it does. It is exactly as you wrote some time earlier. The work
>> is scheduled after is was cancelled and should not trigger anymore. Or,
>> it is scheduled before it is supposed to do. Could you try the attached
>> patch and report what happens with that patch?
>>
>> PS I can't reproduce by whatever I tried.
>>
>> thanks,
>>
> 
> Interesting...
> 
> [  388.783955] tty is bad=0 ops=          (null)Pid: 6480, comm: kworker/1:2 Tainted: G        W
> 3.7.0-rc3-next-20121102-sasha-00002-gbb570e0-dirty #111

So after fuzzing for a while I'm also seeing these:

[  603.533932] tty is bad=-2 ops=          (null)Pid: 37, comm: kworker/4:0 Tainted: G        W    3.7.0-rc3-next-20121102-sasha-000
02-gbb570e0-dirty #112


Thanks,
Sasha
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