linux-kernel - Re: [SOLVED] kernel module loading does not work with binutils-gold (was Re: [Bug #14626] oops on boot starting udev)

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Message-ID: <4B07B9BA.2070607@gmail.com>
Date:	Sat, 21 Nov 2009 01:58:18 -0800
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Soeren Sonnenburg <sonne@...ian.org>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Greg KH <greg@...ah.com>, "Rafael J. Wysocki" <rjw@...k.pl>,
	linux-input@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [SOLVED] kernel module loading does not work with binutils-gold
 (was Re: [Bug #14626] oops on boot starting udev)

Soeren Sonnenburg wrote:
> On Sat, 2009-11-21 at 09:56 +0100, Soeren Sonnenburg wrote:
>    
>> On Wed, 2009-11-18 at 18:59 -0800, Dmitry Torokhov wrote:
>>      
>>> On Tue, Nov 17, 2009 at 05:06:47AM +0100, Soeren Sonnenburg wrote:
>>>        
>>>> On Mon, 2009-11-16 at 20:01 -0800, Dmitry Torokhov wrote:
>>>>          
>>>>> On Tue, Nov 17, 2009 at 03:59:03AM +0100, Soeren Sonnenburg wrote:
>>>>>            
>>>>>> On Mon, 2009-11-16 at 18:04 -0800, Dmitry Torokhov wrote:
>>>>>>              
>>>>>>> On Mon, Nov 16, 2009 at 05:14:55PM -0800, Greg KH wrote:
>>>>>>>                
>>>>>>>> On Mon, Nov 16, 2009 at 11:37:48PM +0100, Rafael J. Wysocki wrote:
>>>>>>>>                  
>>>>>>>>> This message has been generated automatically as a part of a report
>>>>>>>>> of recent regressions.
>>>>>>>>>
>>>>>>>>> The following bug entry is on the current list of known regressions
>>>>>>>>> from 2.6.31.  Please verify if it still should be listed and let me know
>>>>>>>>> (either way).
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=14626
>>>>>>>>> Subject		: oops on boot starting udev
>>>>>>>>> Submitter	: Soeren Sonnenburg<sonne@...ian.org>
>>>>>>>>> Date		: 2009-11-14 10:16 (3 days old)
>>>>>>>>> References	: http://marc.info/?l=linux-kernel&m=125819380206800&w=4
>>>>>>>>>                    
>>>>>>>> This looks like an input core problem, as the evdev module was just
>>>>>>>> loaded and died.
>>>>>>>>
>>>>>>>> Any input developers have any ideas?
>>>>>>>>
>>>>>>>>                  
>>>>>>> Hmm, evdev does:
>>>>>>>
>>>>>>> 	dev_set_name(&evdev->dev, "event%d", minor);
>>>>>>>
>>>>>>> Not sure how it can go wrong...
>>>>>>>                
>>>>>> Anything I should/could do to narrow it down a bit (apart from
>>>>>> bisecting?).
>>>>>>
>>>>>>              
>>>>> Umm, I looked through the changes between -rc6 and 7 but nothing jumped
>>>>> out at me... You don't happen to have any local changes in your tree?
>>>>>            
>>>> Well only the mouse button #1 emulation - though I don't see what could
>>>> go wrong there.
>>>>
>>>>          
>>> I have been looking through the changes and I really don't see anything
>>> suspicious. I am also not hittign this oops on any of my boxes. Any
>>> chance you could bisect?
>>>
>>> Thanks.
>>>        
>> Alright so I tried to do a bisect when I noticed that building a knwon
>> to work -rc5 did no longer work either. Thought it might be a gcc
>> problem (gcc-4.3 here) so upgraded to 4.4 - same thing.
>> Then I recognized that it crashes on loading basically *any* module,
>> tried tun and applesmc. Attaching the crashes...
>>
>> I am starting to run out of ideas...
>>      
>
> OK, I've found the culprit: binutils-gold
>
> I build all kernels upto and including -rc6 with the old binutils and
> since then have upgraded to binutils gold 2.20-4 which - in contrast to
> the old binutils - uses --no-add-needed per default.
>
> So I suspect it triggers an error(?) in the way how the kernel links
> modules: It is now required to provide all needed libraries to the
> linker when building the modules. I guess this problem could be worked
> around by adding --add-needed to the LDFLAGS_MODULE ...
>
> Soeren
>    
tough to say... some how your hitting
  __wait_status during your initial boot.

by looking at the comment(in applesmc.c):
__wait_status - Wait up to 32ms for the status port to get a certain value
  * (masked with 0x0f), returning zero if the value is obtained.

maybe your hitting a different value because of binutls.
(keep in mind I have the latest binutils running on the macbook,
but nothing switched to gold during compilation time)

Justin P. Mattock



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