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xen-devel
Re: [Xen-devel] [PATCH] Unmatched decrementing of net device reference c
Glauber de Oliveira Costa <gcosta@xxxxxxxxxx> wrote:
>
> This bug was found when heavy stressing the netfront
> attach/detach mechanism with the following script:
>
> for i in $(seq 200);
> do
> xm network-attach <domid>;
> xm network-detach <domid> $i;
> done
>
> Guest kernel shows the following messages:
>
> unregister_netdevice: waiting for eth1 to become free. Usage count = -1
>
> After this patch, it ran okay in multiple iterations
Could you please use in-line patches? It's much easier to comment on.
Your patch description doesn't make sense. unregister_netdev()
cannot possibly cause the device to be freed. Otherwise the
subsequent free_netdev() call which you kept would be wrong.
So most likely what's happening is that free_netdev() is occuring
without a preceding unregister_netdev(), which implies that there
is a bug in the frontend state transition.
Cheers,
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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