[BUG] New Kernel Bugs

Adrian Bunk bunk at kernel.org
Tue Nov 13 13:12:28 EST 2007

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 

> 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 

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


[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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