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

To: Bart Van Kerckhove <bart@xxxxxxxx>
Subject: Re: [Xen-devel] Possible bug, gplpv / pv-netdev
From: Andrew Lyon <andrew.lyon@xxxxxxxxx>
Date: Sun, 26 Jul 2009 14:17:59 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, James Harper <james.harper@xxxxxxxxxxxxxxxx>
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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
> - 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..


> 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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> Xen-devel@xxxxxxxxxxxxxxxxxxx
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