Xen devel - Dec 2006 - Problem of netfront by network-attach/detach

Hi All,

We tested the xm network-attach/detach command.
It repeats network-attach/detach command for DomU and pv-on-hvm on HVM Domain.
(network-attach → network-detach → network-attach → network-detach → ...)

If network-attach/detach command is repeated 13 times, the following errors
occur.

### netfront can''t alloc rx grant refs
vif vif-13: 12 creating netdev
vif vif-13: 12 xenbus_dev_probe on device/vif/13

After that, the same problem occurred.

The environment is as follows.
・xen-unstable.hg : cs 13129
     DomU and pv-on-hvm on HVM Domain

Thanks

--
Takanori Kasai



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Hi,

This issue is caused by 
netif_release_rx_bufs@drivers/xen/netfront/netfront.c

         if (np->copying_receiver) {
                 printk("%s: fix me for copying receiver.\n",
__FUNCTION__);
                 return;
         }

This code makes memory leaking.
for example, GrantTable is allocated 256 but freed 192(by seeing
gnttab_free_count).
This makes 64table leaking for every network-attach/detach operation.

To fix this issue, we need to fix copying receiver.
Is there any suggestion on this?

Thanks
Atsushi SAKAI

>Hi All,
>
>We tested the xm network-attach/detach command.
>It repeats network-attach/detach command for DomU and pv-on-hvm on HVM
Domain.
>(network-attach → network-detach → network-attach → network-detach → ...)
>
>If network-attach/detach command is repeated 13 times, the following errors
>occur.
>
>### netfront can''t alloc rx grant refs
>vif vif-13: 12 creating netdev
>vif vif-13: 12 xenbus_dev_probe on device/vif/13
>
>After that, the same problem occurred.
>
>The environment is as follows.
>・xen-unstable.hg : cs 13129
>     DomU and pv-on-hvm on HVM Domain
>
>Thanks
>
>--
>Takanori Kasai
>
>
>
>_______________________________________________
>Xen-devel mailing list
>Xen-devel@lists.xensource.com
>http://lists.xensource.com/xen-devel
>






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