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Date:	Thu, 22 Mar 2007 01:32:36 +0000
From:	Sid Boyce <g3vbv@...eyonder.co.uk>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Adrian Bunk <bunk@...sta.de>, linux-kernel@...r.kernel.org,
	auxsvr@...il.com
Subject: Re: 2.6.21-rc1 and 2.6.21-rc2 kwin dies silently

Eric W. Biederman wrote:
> Adrian Bunk <bunk@...sta.de> writes:
>
>   
>> On Wed, Mar 21, 2007 at 05:43:11PM +0000, Sid Boyce wrote:
>>     
>>> Sid Boyce wrote:
>>>       
>>>> Andrew Morton wrote:
>>>>         
>>>>> (cc restored.  Please always do reply-to-all)
>>>>>
>>>>>
>>>>>           
>>>>>> On Wed, 28 Feb 2007 18:05:13 +0200 auxsvr@...il.com wrote:
>>>>>> On Wednesday 28 February 2007 17:19, Sid Boyce wrote:
>>>>>>   
>>>>>>             
>>>>>>> openSUSE 10.3 Alpha and KDE-3.5.6, xorg-x11-7.2. KDE is setup not to
>>>>>>> require a password to unlock, but it asks for password. When the screen
>>>>>>> unlocks, kwin is gone with no errors logged in /var/log/kdm or
>>>>>>> /var/log/messages. No problems with 2.6.20.
>>>>>>>
>>>>>>> Same problem on openSUSE 10.2 x86_64, KDE-3.5.5 and 2.6.21-rc2.
>>>>>>> Regards
>>>>>>> Sid.
>>>>>>>      
>>>>>>>               
>>>>>> This is the linux kernel mailing list. Perhaps you should post your 
>>>>>> problem to the opensuse mailing list.
>>>>>>    
>>>>>>             
>>>>> 2.6.20 worked.
>>>>>
>>>>> 2.6.20-rc2 did not.
>>>>>
>>>>> Working theory: the kernel broke.
>>>>>
>>>>> Sid, the chances that anyone can work out what caused this are pretty 
>>>>> low. It would be great if you could perform a git bisection search 
>>>>> sometime in
>>>>> the next few weeks, work out which commit caused this.
>>>>>
>>>>> Thanks.
>>>>>
>>>>>
>>>>>
>>>>>  
>>>>>           
>>>> I shall go back to 2.6.20-git3 and work forward. Up to 2.6.20-git2 was OK.
>>>> Regards
>>>> Sid.
>>>>
>>>>         
>>> I tracked the problem down to 2.6.20-git11. Up to 2.6.20-git10 is OK, 
>>> but from 2.6.20-git11 up to current 2.6.21-rc4-git2 all exhibit the problem.
>>>       
>> Thanks for this search.
>>
>> Looking at the changes between 2.6.20-git10 and 2.6.20-git11, the only 
>> suspicious changes are the 60 sysctl patches by Eric.
>>
>> Eric, can you look at this issue?
>>     
>
> git bisect between git10 (ac98695d6c1508b724f246f38ce57fb4e3cec356)
> and git11 (86a71dbd3e81e8870d0f0e56b87875f57e58222b) is likely the most
> productive thing that can be done right now.  
>
> I can't think of anything in my sysctl patches that would kill an
> application.  My sysctl work is right on the border with user space
> so it is a good candidate but at the same time there should have
> been no user visible changes.  There were a few places where
> I removed sys_sysctl support (but not /proc/sys support) but I don't
> think any of those were on x86, and they were is such a messed up
> state I don't think anyone could have reasonably used them anyway.
>
> So I think either we poke blindly making random guess by hand or
> we let git-bisect do it.
>
> Sid do you think you can figure out git-bisect?
> git-bisect start
> git-bisect bad 86a71dbd3e81e8870d0f0e56b87875f57e58222b
> git-bisect good ac98695d6c1508b724f246f38ce57fb4e3cec356
>
> It should narrow the problem down to a single commit in 6-8 tries
> after which point we should have enough information to start
> making intelligent guesses. 
>
> Eric
>
>
>   
Reading the manpage doesn't help, so I shall have to delve  into the 
docs or  futher help is needed.
:/usr/src/linux-2.6.20-git11 # git-bisect good 
ac98695d6c1508b724f246f38ce57fb4e3cec356
No revs to be shown.

:/usr/src/linux-2.6.20-git11 # ls .git/refs/bisect/
bad                                            
good-ac98695d6c1508b724f246f38ce57fb4e3cec356

:/usr/src/linux-2.6.20-git11 # less 
.git/refs/bisect/good-ac98695d6c1508b724f246f38ce57fb4e3cec356
ac98695d6c1508b724f246f38ce57fb4e3cec356

:/usr/src/linux-2.6.20-git11 # less .git/refs/bisect/bad
86a71dbd3e81e8870d0f0e56b87875f57e58222b
Regards
Sid.

-- 
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks


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