linux-kernel - Re: find_busiest

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Date:	Wed, 16 Jul 2014 17:27:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Greg Donald <gdonald@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>
Subject: Re: find_busiest_group divide error

On Mon, Jul 14, 2014 at 11:56:59AM -0500, Greg Donald wrote:
> 
> [1.] One line summary of the problem:
> 
> find_busiest_group divide error
> 
> [2.] Full description of the problem/report:
> 
> Around June 7th I found I could no longer boot a mainline kernel.  I
> posted about it here on June 9th:
> 
> http://lists.kernelnewbies.org/pipermail/kernelnewbies/2014-June/010914.html
> 
> I bisected two complete times but never got to a commit that made any
> sense:
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=77711
> 
> I see a lot of kernel/sched/fair.c patching appeared in mainline on June
> 5th:
> 
> https://github.com/torvalds/linux/commits/master/kernel/sched/fair.c
> 
> So I tried checking out specific revisions and found
> 09dc4ab03936df5c5aa711d27c81283c6d09f495 is the latest good revision I
> can boot.  The first bad revision I hit is
> 51f2176d74ace4c3f58579a605ef5a9720befb00.
> 
> I have no idea how to fix it.  I'm just a web developer/kernel tester :(
> 

Could you confirm if reverting caffcdd8d27ba78730d5540396ce72ad022aff2c
cures things for you?

Otherwise there's two very similar issues, see also:

   lkml.kernel.org/r/20140716145546.GA6922@...ff.to

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