Re: [Xen-devel] Problem of netfront by network-attach/detach

[Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>]

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
>
>
>
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