Kernel 'bisection'

Peter Waller peter at scraperwiki.com
Sat Feb 14 13:05:47 UTC 2015


Briefly, bisection is a way of taking a long list of 1000's of changes, and
arranging things so that you only have to test more like 10 of them,
because you test midpoints. (and 2^10 ~ 1000).

More detail:

http://alblue.bandlem.com/2011/07/git-tip-of-week-git-bisect.html

On 14 February 2015 at 12:57, Liam Proven <lproven at gmail.com> wrote:

> On 14 February 2015 at 02:59, Chris <cpollock at embarqmail.com> wrote:
> > Who can give me some pointers on doing a kernel bisection on either
> > 3.13.0-35 or -36 kernels? Ever since one of those two were installed,
> > I'm on -45 now, my system will lockup (black screen, cursor moves, but
> > CTRL-ALT-F1 will not take me to a terminal log-in. This is the error I
> > see - Feb 13 19:05:22 localhost kernel: [807775.808019]
> > [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render
> > ring idle. I've reported this last year on Launchpad as bug -
> > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402331 I've jumped
> > through all the hoops that have been suggested there except doing a
> > kernel bisection which seems to have me confused. I'm really getting a
> > bit tired of these continued 'lockups'.
>
>
> I have to ask. WTF is a "kernel bisection"?
>
> You want to... cut your kernel in half? Is this some kind of Solomonic
> judgement? Because, you know, like half a baby doesn't work, half a
> kernel won't, either.
>
> --
> Liam Proven • Profile: http://lproven.livejournal.com/profile
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