linux-kernel - Re: [BUG] New Kernel Bugs

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Message-ID: <20071113181228.GF4250@stusta.de>
Date:	Tue, 13 Nov 2007 19:12:28 +0100
From:	Adrian Bunk <bunk@...nel.org>
To:	Mark Lord <liml@....ca>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, protasnb@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	alsa-devel@...a-project.org, linux-ide@...r.kernel.org,
	linux-pcmcia@...ts.infradead.org,
	linux-input@...ey.karlin.mff.cuni.cz,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [BUG] New Kernel Bugs

On Tue, Nov 13, 2007 at 12:50:08PM -0500, Mark Lord wrote:
> Ingo Molnar wrote:
>>
>> for example git-bisect was godsent. I remember that years ago bisection of 
>> a bug was a very laborous task so that it was only used as a final, 
>> last-ditch approach for really nasty bugs. Today we can autonomouly bisect 
>> build bugs via a simple shell command around "git-bisect run", without any 
>> human interaction! This freed up testing resources 
> ..
>
> It's only a godsend for the few people who happen to be kernel developers

It's also godsend for users who want a regression they observe fixed.

If you can tell which patch broke it you often turned a very hard to 
debug problem into a relatively easy fixable problem.

As an example, [1] was an issue a normal user could discover, and 
bisecting made the difference between "nearly undebuggable" and
"easily fixable by revertng a commit".

> and who happen to already use git.

As already said in thread, the required instructions for bisecting are 
relatively short and simple (assuming the user can build his own 
kernels).

> It's a 540MByte download over a slow link for everyone else.

Not everyone has a slow connection.

For me, the speed of cloning a tree from git.kernel.org is completely 
cpu bound and limited by the speed of the 1.8 Ghz Athlon in my 
computer...

But if there is a real life problem like people with extremely slow and 
expensive internet connections not being able to bisect bugs these 
problems should be named and fixed (e.g. by sending CDs).

> -ml

cu
Adrian

[1] http://lkml.org/lkml/2007/11/12/154

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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