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Date: Tue, 13 May 2008 21:00:24 +0200 From: Heiko Carstens <heiko.carstens@...ibm.com> To: Avi Kivity <avi@...ranet.com> Cc: linux-kernel <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu> Subject: Re: [BUG] cpu hotplug vs scheduler On Tue, May 13, 2008 at 06:33:00PM +0300, Avi Kivity wrote: > 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. FWIW, this happens on s390 as well (without kvm support). But until now I didn't have time to look into it. Didn't report it here yet, since we had plenty of cpu hotplug changes in arch code, so I suspected a bug there. This doesn't seem to be the case. It takes only a few minutes to trigger the bug here. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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