> when these messages appear, removing r8169 would appear to be key. Indeed, if 
quoted text
> there is no significant libata activity, the problem still occurs on the NIC 
> within approximately the same amount of transfer.

You seem to have a leak, which actually isn't suprising

	rtl8169_xmit_frags allocates a set of maps for a fragmented packet

	rtl8169_start_xmit allocates a buffer

When we finish the transit we free the main buffer (always using skb->len
when sometimes its skb->headlne. We don't seem to free the fragment
buffers at all.

Looks like the unmap path for fragmented packets is broken with any kind
of iommu

Alan
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