Strange error messages from xnb on dom0. What do they mean?

[Brian Buhrow]

	hello.  Occasionally I see messages like the following from my FreeBSD-12.2/dom0 machine.
Is this related to the issue of the NetBSD domu's seeing bursts of oversized packets, which I assume
is caused by packets getting sent from the dom0 to the domu in batches rather than one at a
time, each with an interrupt signal, or, the xen equivalent?

On the domu's I see:
xennet0: discarding oversize frame (len=1518)

I see the following messages on the dom0, but not necessarily at the same time as the above
messages appear in the domu's.

Any ideas?
-thanks
-Brian


Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_ring2pkt:1532): Unknown extra info type 255.  Discarding packet
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:302): netif_tx_request index =0
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:303): netif_tx_request.gref  =0
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:304): netif_tx_request.offset=0
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:305): netif_tx_request.flags =8
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:306): netif_tx_request.id    =69
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:307): netif_tx_request.size  =1000
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:302): netif_tx_request index =1
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:303): netif_tx_request.gref  =255
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:304): netif_tx_request.offset=0
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:305): netif_tx_request.flags =0
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:306): netif_tx_request.id    =0
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_dump_txreq:307): netif_tx_request.size  =0
Apr 25 14:56:35 xen-lothlorien kernel: xnb(xnb_rxpkt2rsp:2066): Got error -1 for hypervisor gnttab_copy status