Re: [win-pv-devel] race in vif-common.sh

[Andreas Kinzler <ml-ak@xxxxxxxxx>]

Sorry, wrong list.

On 03.07.2017 13:26, Andreas Kinzler wrote:
> Hello
>
> in /etc/xen/scripts/vif-common.sh there is a function handle_iptable. At its start there 
> is a check for a working iptables implementation. This check is outside the iptables lock 
> section (claim_lock "iptables") and even if it is only a read-only operation 
> the underlying iptables operation still accesses the xtables lock. I debugged a 
> malfunction (=race) with multiple vif-interfaces down to the following iptables error 
> message in the check section above:
>
> iptables -L -n
> Another app is currently holding the xtables lock. Perhaps you want to use the 
> -w option?
>
> So this check needs to be inside the lock or removed at all (iptables should be 
> working).
>
> Regards Andreas
>
>
>
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