Re: [Xen-API] race condition during /etc/xensource/scripts/vif call

[Jonathan Ludlam <Jonathan.Ludlam@xxxxxxxxxxxxx>]

Interesting - it might be that you're racing with xapi - it's waiting for the 
hot plug key to be removed, which is what the xenstore-rm does. Have a look 
here:

https://github.com/xen-org/xen-api/blob/master/ocaml/xenops/device.ml#L752

(Note that this is more current than XCP 1.0 or 1.1, but the general gist is 
the same)

Jon
 
On 22 Sep 2011, at 16:18, George Shuklin wrote:

> Good day. 
> 
> Found strange situation for VM with two or more interfaces: data
> from /xapi for domain disappear before vif remove called second time.
> 
> Here little patch to vif script (against XCP 1.1 beta) to log XenStore
> state:
> 
> --- vif.orig  2011-05-19 02:32:19.000000000 +0400
> +++ vif       2011-09-22 19:11:10.000000000 +0400
> @@ -227,6 +227,8 @@
>         xenstore-rm "${HOTPLUG}/hotplug"
>     fi
>     logger -t scripts-vif "${dev} has been removed"
> +    echo ====domid=$DOMID===== >>/var/log/vif-race.log
> +    xenstore-ls /xapi >>/var/log/vif-race.log
>     remove_from_bridge
>     ;;
> esac
> 
> 
> To see 'strange' add to any vm two interfaces and reboot it.
> 
> In vif-race.log for second time vif call:
> ====domid=3=====
> 0 = ""
> hotplug = ""
>  vbd = ""
> private = ""
>  vbd = ""
>   51712 = ""
>    ref = "OpaqueRef:1a7992ae-a645-acc6-bf51-3a0202bdd4c7"
> frontend = ""
>  vbd = ""
> 3:
> 
> (no data for domid 3).
> 
> I'm not sure if this is a really serious bug, but I found my
> antispoofing patch does not remove rules from OVS for multihomed VM's
> due lack of 'bridge' variable for VIF (I'm calling remove_restiction()
> function in 'remove' case in vif script).
> 
> I got this bug in XCP 1.0 and XCP1.1 beta.
> 
> 
> 
> _______________________________________________
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> xen-api@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/mailman/listinfo/xen-api


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