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Date:	Sat, 13 Dec 2014 09:15:34 -0500
From:	Sasha Levin <>
To:	Ingo Molnar <>,
	Linus Torvalds <>
CC:	Dave Jones <>, Chris Mason <>,
	Mike Galbraith <>,
	Peter Zijlstra <>,
	Dâniel Fraga <>,
	"Paul E. McKenney" <>,
	Linux Kernel Mailing List <>
Subject: Re: frequent lockups in 3.18rc4

On 12/13/2014 03:27 AM, Ingo Molnar wrote:
> * Ingo Molnar <> wrote:
>> * Linus Torvalds <> wrote:
>>> On Fri, Dec 12, 2014 at 10:54 AM, Dave Jones <> wrote:
>>>> Something that's still making me wonder if it's some kind of 
>>>> hardware problem is the non-deterministic nature of this bug.
>>> I'd expect it to be a race condition, though. Which can easily 
>>> cause these kinds of issues, and the timing will be pretty 
>>> random even if the load is very regular.
>>> And we know that the scheduler has an integer overflow under 
>>> Sasha's loads, although I didn't hear anything from Ingo and 
>>> friends about it. Ingo/Peter, you were cc'd on that report, 
>>> where at least one of the multiplcations in wake_affine() ended 
>>> up overflowing..
>> Just to make sure, is there any other wake_affine report other 
>> than the one in this thread? (I tried a wake_affine full text 
>> search on my inbox and didn't find anything that appeared 
>> relevant.)
> Found the report from Sasha:
>     sched: odd values for effective load calculations
> right?

Yup, that's the one.


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