linux-kernel - Re: [BUG] cpu hotplug vs scheduler

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Message-ID: <4829B4AC.6090909@qumranet.com>
Date:	Tue, 13 May 2008 18:33:00 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
CC:	Ingo Molnar <mingo@...e.hu>
Subject: Re: [BUG] cpu hotplug vs scheduler

Avi Kivity wrote:
> I'm testing host cpu hotplug with kvm.  Basically running 7 guests on 
> a 4 core machine, offlining and onlining host cpus at random.  
> Eventually I hit this:
>

[snip oops]

> This seems to be the assignment to cfs_rq after pick_next_entity().
>
> I'm running kvm.git, which is currently 2.6.26-rc2 plus a few kvm 
> patches.  It could be kvm's fault, but it doesn't appear so from the 
> traces.
>

I get the same oops running with the kvm modules unloaded.  None of 
kvm.git's changes are in core code, so this is definitely a mainline 
problem.

It took about 40 minutes to reproduce; 1200 cpus onlined and 1200 cpus 
offlined.

-- 
error compiling committee.c: too many arguments to function

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