linux-kernel - Re: system gets stuck in a lock during boot

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Date:	Wed, 26 Aug 2009 07:42:45 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: system gets stuck in a lock during boot

Ingo Molnar wrote:
> * Justin P. Mattock<justinmattock@...il.com>  wrote:
>
>    
>> Ingo Molnar wrote:
>>      
>>> * Justin Mattock<justinmattock@...il.com>   wrote:
>>>
>>>
>>>        
>>>> O.K. I feel better, deleted
>>>> my system, and threw in a minimal built system
>>>> with only the bare essentials to boot.
>>>> (just to make sure things are correct).
>>>>
>>>> unfortunately after building rc6 I'm still hitting
>>>> this. really am not sure why this is happening.
>>>>
>>>>          
>>> Could you please double-check the bisection result by doing this:
>>>
>>>    git revert af6af30c0f
>>>
>>> on the latest kernel and seeing whether that fixes the lockup?
>>>
>>> Bisections are very efficient and hence very sensitive as well to
>>> minimal errors. Just one small mistake near the end of a bisection
>>> can blame the wrong commit.
>>>
>>> So the best way to double-check such 100%-triggerable crashes is to
>>> do the revert. I tried the revert and it can be done fine here.
>>>
>>> [ _If_ that does not fix the bug then to save time you can
>>>      'backtrack' the bisection, instead of re-doing it completely.
>>>      I.e. you have your bisection log, re-check the final steps going
>>>      backwards. Once you find a discrepancy (i.e. a 'bad' point that
>>>      is 'good' or the other way around), redo the bisection log
>>>      commands up to that point and continue it up to the end. ]
>>>
>>> 	Ingo
>>>
>>>
>>>        
>> shoot, I did not see your post here. when looking at my bisect
>> log, I guess after a git bisect reset it clears?
>>
>> Anyways after git bisect had finished I looked manually at the
>> commits that it had generated the one which I had sent in a post
>> previously, and this one:
>>
>>   9424edc2da097c8589fcc24a72552d33e54be161
>>      
>
> (this commit has no effect on your kernel image, at all.)
>
>    
yep. but it was worth a try.
>> at the time looking at the commit, I see this to be more of the
>> cause because of it being related to elf as so forth, but as soon
>> as I reverted this on rc6 made no difference.(the previous commit
>> fixes this for me, on a regular tar.ball as well as in git.
>>
>> I think at this point since this system is a fresh from scratch
>> build, I think something might be wrong that I'm doing (all the
>> CFLAGS, and such are in a previous post).
>>
>> At the moment I don't have a problem applying a patch to the
>> kernel for this. especially since I'm the only one that seems to
>> be hitting this, then if more and more reports of this happen then
>> we can go from there.
>>      
>
> What would be nice is to verify your bisection end result, i.e. do
> what i suggested:
>
>    
yeah I've done this on both kernels three to be exact, and all boot 
after reverting
Fix perf-tracepoint OOPS.

As for my system, I'm still convinced that I might be doing something 
wrong over here.

>>> Could you please double-check the bisection result by doing this:
>>>
>>>    git revert af6af30c0f
>>>
>>> on the latest kernel and seeing whether that fixes the lockup?
>>>        
>
> if this doesnt fix it on latest -git then this commit is not the
> cause of the lockup.
>
> 	Ingo
>
>    
This commit(Fix perf-tracepoint OOPS.)does fix my stuckage, but I'm 
left, as well as others asking
the question of why.
In any case I still think I'm setting something wrong with either gcc, 
or something
that might be causing this from userland.

Justin P. Mattock
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