Re: [Xen-devel] Possible bug, gplpv / pv-netdev

[Andrew Lyon <andrew.lyon@xxxxxxxxx>]

On Sat, Jul 25, 2009 at 4:25 PM, Bart Van Kerckhove<bart@xxxxxxxx> wrote:
> Dear list,
>
> I have been struggling with this issue for quite a while, and decided to
> mail in for some pointers, since I'm stuck.
>
> I'm running xen3.4.0 , and while using windows 2003 x64 and GPLPV (up to
> 0.10.0.86) - I keep running into the following kernel error message in dom0:
>
> [ 9266.293979] unregister_netdevice: waiting for vif31.0 to become free.
> Usage count = 2
> [ 9276.433986] unregister_netdevice: waiting for vif31.0 to become free.
> Usage count = 2
>
> This results in total deadlock as far as accessing interfaces goes, as well
> as xend.
> Only a reboot can get me out of this.
> I can reproduce this problem easily: boot up windows with GPLPV, disable the
> (pv) network interface in windows, enable it again, then disable it again.
> At this point, windows should hang - destroy the VM and this error pops up.
>

I ran into a similar problem last week while testing different
versions of the gplpv xennet driver, I was able to update the driver
once, but the second attempt never finished, eventually I got a
timeout message in windows but when I tried to reboot the system
became unresponsive and I had to destroy the hvm.

Its easy to replicate, just keep switching the xennet driver between
two versions.

Sounds like it could be the same bug..

Andy

> I've googled this error and found some mentioning of it earlier on, but no
> solutions.
> This seems like a xen bug, not a gplpv one, since imho it should not be
> possible to crash the dom0 from within a domU...
>
>
> First post to this list, please excuse me, and feel free to ask for more
> details / info.
> I can provide access to the system in question (although this is not the
> first system I encounter this problem with)
>
> Kind regards,
>
> -Bart Van Kerckhove
>
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> http://lists.xensource.com/xen-devel
>
>

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