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Re: [Qemu-devel] race between kvm-kmod-3.0 and kvm-kmod-3.3 // was: race


From: Peter Lieven
Subject: Re: [Qemu-devel] race between kvm-kmod-3.0 and kvm-kmod-3.3 // was: race condition in qemu-kvm-1.0.1
Date: Tue, 03 Jul 2012 15:15:04 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.23) Gecko/20110921 Thunderbird/3.1.15

On 03.07.2012 15:13, Avi Kivity wrote:
On 07/03/2012 04:01 PM, Peter Lieven wrote:
Further output from my testing.

Working:
Linux 2.6.38 with included kvm module
Linux 3.0.0 with included kvm module

Not-Working:
Linux 3.2.0 with included kvm module
Linux 2.6.28 with kvm-kmod 3.4
Linux 3.0.0 with kvm-kmod 3.4
Linux 3.2.0 with kvm-kmod 3.4

I can trigger the race with any of qemu-kvm 0.12.5, 1.0 or 1.0.1.
It might be that the code was introduced somewhere between 3.0.0
and 3.2.0 in the kvm kernel module and that the flaw is not
in qemu-kvm.

Any hints?

A bisect could tell us where the problem is.

To avoid bisecting all of linux, try

    git bisect v3.2 v3.0 virt/kvm arch/x86/kvm


would it also be ok to bisect kvm-kmod?

thanks,
peter




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